I Used Bugatti Veyron Parts & An Alex Trick To Fix My CL65 AMG V12! You Won't Believe What Happened!

Summary

In this video, the host attempts to diagnose and fix issues with his Mercedes CL65 AMG. Despite replacing parts like the fuel filter and adding an extra fuel pump, the car stills cuts power and goes into limp mode during wide open throttle tests. The host eventually realizes the catalytic converters seem clogged so he removes and chemically cleans them, which improves power and throttle response. However, during dyno testing the issues return, leaving the root cause still a frustrating mystery requiring further troubleshooting.

Takeaways

• 😟 The narrator is having ongoing issues with his CL65 AMG car not performing properly and going into 'limp mode'
• 👨‍🔧 He tries many things to fix it - replacing the fuel filter, fuel pump, cleaning the catalytic converters etc
• 🤔 The car seems to run well at lower speeds but has issues at high throttle
• 🔍 He uses testing equipment to monitor fuel pressure, O2 sensors, boost pressure etc to diagnose
• 😡 The car continues to underperform and go into limp mode even after all his troubleshooting
• 🧐 He suspects issues like bad throttle body or boost pressure sensors could be causing the problems
• 🏎 Takes it to a dyno but it only makes 280HP instead of expected 500+HP before going into limp mode
• 🤬 Is very frustrated and disappointed that he can't seem to fix the ongoing issues with the car
• 🔧 Will continue investigating - considers getting a new throttle body or taking it to a tuner shop
• ❓The root cause remains a mystery even after all the work done so far

Q & A

What kind of car is the narrator working on?

The narrator is working on a Mercedes-Benz CL65 AMG.

What is the main issue the narrator is trying to diagnose and fix?

The main issue is that the car goes into limp mode with flashing engine lights after 3 seconds of wide open throttle. This appears to be caused by low fuel pressure.

What was the eventual fix for the fuel pressure issue?

The narrator added a second fuel pump from a Bugatti Veyron to supplement the existing fuel pump.

Did cleaning out the catalytic converters help resolve the issue?

Yes, cleaning out the clogged catalytic converters did seem to help increase performance and reduce issues when accelerating hard.

What horsepower and torque numbers did the car put down on the dyno?

On the dyno run, the car made 280 horsepower and 470 ft-lbs torque before going into limp mode and cutting out.

What other issues came up during dyno testing?

During dyno runs, the engine started going rich right before going into limp mode, which was unusual.

What is the narrator's next step in diagnosing the problem?

The narrator plans to investigate the throttle body as a potential culprit and try replacing it.

Does the narrator resolve the issues by the end of the video?

No, by the end the root cause still has not been definitively determined or fixed.

How long has the narrator been working on trying to fix this car?

The narrator mentions he has been working on trying to fix issues with this CL65 AMG for about 5 months with no definitive resolution yet.

What is the narrator's overall sentiment about the car by the video's conclusion?

By the end, the narrator is very frustrated and disappointed with the car, feeling like he has reached a dead end diagnostically despite extensive work.

Outlines

00:00

🛠️ Getting Started on Fixing the Mercedes CL65 AMG Issues

The video starts with an overview of the issues with the Mercedes CL65 AMG. The car has been very problematic with a limp mode issue after going wide open throttle. Recently a possible breakthrough was found regarding low fuel pressure as a potential cause. A fuel pressure gauge was installed which showed the pressure drops below spec under throttle, indicating a possible fuel system issue.

05:01

💳 Tire Website Recommendation and Discount Code

A recommendation is made for the tire website PriorityTire.com which has good deals and discounts. A new discount code is provided to save 5% off purchases. The site is noted to have free shipping, easy mobile access, and find installers. Recommendations are made for specific tires purchased for different vehicles.

10:02

🛢️ Testing the Fuel System Issues on the Road

With the fuel sensor unplugged to provide maximum voltage to the fuel pump, road testing is done. The car still goes into limp mode indicating the fuel pressure issue persists. The fuel filter and pump will need to be replaced despite lack of faith they will resolve the problems.

15:03

🛠️ Replacing the Fuel Filter

The fuel filter is replaced with a new AMG-specific one from FCP Euro. Road testing still results in limp mode and fuel pressure drops indicating the filter replacement did not resolve the issues.

20:05

🛢️ Replacing the Fuel Pump

The original fuel pump from 2005 is replaced with a new one, but road testing still results in limp mode and fuel pressure drops. The fuel system issues remain unresolved.

25:06

⚡ Testing the Fuel Pump Voltage Control Box

Voltage drop is detected across the fuel pump voltage control box indicating a possible issue preventing full voltage to the pumps. The box may need replacement if it is limiting voltage.

30:07

🔧 Removing and Inspecting the Fuel Line Strainer

The fuel strainer screen on the supply line from the tank is removed and inspected but found to be clean. Replacing it does not resolve the issues.

35:09

⚡ Adding a Second Fuel Pump

A second fuel pump is added along with a Hobbs switch to activate it under boost. This resolves the fuel pressure issues in initial testing without setting any codes.

40:10

📈 Testing for Clogged Catalytic Converters

Data indicates one cat may be clogged so the exhaust system is removed. The cats are cleaned and road testing feels improved pointing to the clogged cats as an additional issue.

45:10

😔 No Fix Yet After Chassis Dyno Testing

Even with increased fuel pressure and cleaned cats, dyno testing results in limp mode indicating more diagnoses needed. Causes may include the throttle body, tuning, or other issues.

Keywords

💡CL65 AMG

This refers to the Mercedes-Benz CL65 AMG, which is the car that the narrator is trying to fix throughout the video. It is a high-performance luxury coupe known for its reliability issues, which is a core theme of the video - diagnosing and solving problems with the temperamental CL65.

💡limp mode

Limp mode refers to when a car's computer detects a problem and shuts down parts of the engine to prevent damage. This is a key issue that the CL65 faces, going into limp mode after wide open throttle, which the narrator spends much of the video trying to diagnose and fix.

💡fuel pressure

Fuel pressure refers to the pressure at which fuel is delivered to the engine. Insufficient fuel pressure is identified early on as a likely cause of the CL65's problems. Fixing the fuel pressure system is a major focus of the diagnostics.

💡misfire

A misfire happens when fuel fails to ignite in one or more engine cylinders. The narrator notes the CL65 showing misfire codes related to its limp mode issues, requiring diagnosis of the root cause.

💡throttle body

The throttle body controls air flowing into the engine. At the end, problems with the CL65 throttle body are speculated as a possible cause of issues, showing how much is still unknown.

💡fuel filter

The fuel filter cleans debris from fuel before it reaches engine components. Replacing the old fuel filter is one attempt to fix the CL65's problems, though it ultimately does not solve the issues.

💡fuel pump

The fuel pump moves fuel from the tank to the engine. The narrator replaces the aging pump to try increasing fuel pressure to the engine, one attempt to address limp mode.

💡catalytic converter

The catalytic converter reduces engine exhaust pollution. Cleaning the clogged converters is found to help engine performance, though not solving the underlying issues.

💡base tune

A base tune refers to an initial engine tuning mapping for the CL65's modifications. Updating this is expected to help performance, but limp mode problems persist on the dyno.

💡dyno

A dyno, or dynamometer, measures vehicle engine performance. Despite extensive work, the CL65 exhibits the same problems on the dyno, unable to reach expected horsepower.

Highlights

I've been fighting a limp mode issue only after I go wide open throttle for about 3 seconds

We may have a fuel pressure issue. The fuel pressure drops below 55 PSI at wide open throttle.

The intake air temperatures seem normal based on thermal camera readings.

Replacing the fuel filter and pump didn't fix the issue. The fuel pressure still drops too low.

Added a second fuel pump like the Bugatti Veyron to provide enough pressure.

Cleaning out the clogged catalytic converters helped free up some power.

After cleaning the cats, the sound changed significantly, indicating they were clogged.

The car still goes into limp mode even with the added fuel pump and cleaned cats.

On the dyno, the car makes only 280 HP before going into limp mode.

The air/fuel ratio goes very rich right before it cuts out now.

The boost pressure sensors seem to read differently than the mechanical gauge.

Manually checking shows the throttle body is working properly.

After testing many components, the root cause is still unclear.

Will try a throttle body replacement and dyno tuning before further troubleshooting.

The intention was to fix this 5 months ago when I started filming.

Once again this car has disappointed me, but I can't give up on it.

Transcripts

in this video I am fixing my CL65 AMG

and I think I might have had a

breakthrough maybe I bought my CL65 AMG

very very broken and after an insane

amount of work it's less broken but a

car like this will always need something

and recently I've been fighting a limp

mode issue only after I go wide open

throttle for about 3 seconds the check

engine light will start flashing and

half of the cylinders shut down but

outside of misfire codes the car doesn't

tell me anything else now I say I've

been recently fighting this issue

because you'll see in this video the

weather changes a lot and that's because

every time I hit a wall with this car I

get very angry with it and I end up

working on something else and after

forgetting about the anger I dive right

back in with High Hopes which are always

crushed but I just can't give up on this

car so obviously I've had other projects

on the Channel people are asking me

what's going on with the CL65 I work on

it all the time okay this get get out of

here glove but I've been stumped I've

been stumped until maybe maybe right now

take a look at this I got a fuel

pressure gauge going on and it's

possible that we have low fuel pressure

maybe let's let's go for R I'll show you

what I'm talking about it's it's

exciting I mean the fuel pressure goes

low so hopefully we don't blow the

engine but it's

exciting push button start so right now

we have about 55 PSI which is good but

but check this out if I go wide open

throttle it goes down so fuel pressure

drops to the low 40s which it shouldn't

be getting anywhere under 55 PSI at wide

openen throttle so it seems like we have

a fuel pressure issue Let's uh let's go

back to the shop we we may have gotten

somewhere and we may have gotten really

lucky high intake air temperatures low

fuel pressure that can equal boom boom

sometimes now because I want to verify

1,000% that we don't have an intake air

temperature issue I got a new toy I got

a thermal camera so this white Target

here is going to come up right there in

the top top left and then this red guy

is seeking out hot spots so check it out

if we go over to our molten lava engine

we can see here the max is 184 so that's

what you guys are looking at when we use

this tool so at the end of the last

video I was a little suspect that if we

had air bubbles in the heat exchanger

which is this guy in here so we're going

to go around here and take a look at the

temperature of the heat exchanger and

there's our tube right there that goes

to the intercooler pump right where the

white Target is that's the heat

exchanger 5° and we'll go to the other

side here 105 at the top little hard to

tell with everything around it it's kind

of sandwiched in between a bunch of

coolers but that's the radiator that

really hot one is the radiator and

there's the hose for it about 124° that

makes sense that's the hot side and it's

dropping about 20 through the entire

core well I haven't found a Smoking Gun

with the heat exchanger this is just

kind of cool to see to be honest with

you oh my hand i'm 94 degrees am I dead

and that really really cold yeah yeah

I'm dead definitely dead let's see if

there's any difference in the

temperature of the intercoolers they

definitely look the same go a little bit

closer we're at about 114 this one

should be a little cooler it gets hit

with the cold water first so this is

fine not that big of a difference

seriously shouldn't I be like

98° what am I yeah I think everything is

normal here guys the intercooler heat

exchanger system is functioning properly

now last time as soon as we hit it this

thing would fall on its face and then we

did the pump let it out and it would let

us do a few pulls but then it would get

really hot and it would start misfiring

just all of a sudden it would shut us

down and misfire and I'm starting to

wonder if this was a low fuel pressure

situation as well this has a gigantic

inline fuel pump and fuel filter let's

take a look the fuel pump and the filter

are located underneath this and there's

also an ABC suspension valve block that

haunted me for many many weeks oh look

at that look at that in there you see

that there's a piece of plastic inside

of the accumulator look at that what is

this thing oh it was a horrible time in

my life some of you were there but those

days are over now we're just chasing

down you know weird misfire limp home

fuel pressure

issues there we are fuel filter fuel

pump and I hope this doesn't fix it

because a couple years ago when I was

dealing with the ABC I was like yeah

yeah yeah I'll replace this it's clearly

dated 2014 I'll get to that later and

then I never got to it because I was

slightly distracted by the suspension

that I couldn't fix so yes please don't

be that is definitely the easiest thing

to do but right now what I want to do is

there should be a fuel pressure sensor

it's in line I want to disconnect this

there we go and I believe this will max

out our fuel pressure so basically what

happens is this sensor reads the fuel

pressure and it can vary the voltage to

the fuel pump depending on the demand so

this should kind of temporarily just max

it out so we can see if you know if the

car ever cuts out and goes in Lim mode I

think we're going to try it hang on

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and with that let's go for a ride not

not in the DeLorean my another silverish

twodo car check out this fuel

pressure ooh she's maxed out 70 so by

doing this we're testing out the

electronic part of the system so we know

right now that it's giving the fuel pump

maximum voltage let's see if it

drops Full Throttle oh it's still

dropping okay so yeah it dropped down to

like 44 45 which is still below spec it

shouldn't drop below 55 so I think we

have either a bad fuel filter or a bad

pump let's let's go with the cheaper of

the two I should have done this a long

time ago but we have a new fuel filter

from FCP Euro and it is specific for the

AMG couldn't tell you why it could be

because Mercedes just stamped AMG on

there to charge a lot more but at least

we know we're getting the right part all

right so this has the one time oh ah get

sprayed stop spraying me this says the

onetime use clamps you could technically

reuse these but we're not messing around

the days of trying to save money on my

CL65 have long long sailed away into to

the abyss yeah a little pick like this

is the easiest way to release these

release

me there we go all right I think you can

just pry the hoses off like

so there we go and this is the feed from

the tank so I have that clamped off and

I lose a little fuel it's okay whoa and

by a little I mean a

lot why is that so much okay I thought

i' let this sit for long enough to lower

the pressure but I I did not oh man I'm

going to wreak going home

today

dude there we

go go to sleep

now okay so that's not how you do this

wait wait longer for the fuel pressure

to drop don't be impatient now I have a

gasoline armpit right now who needs

deodorant right woo this is nasty let's

keep going no more pressure stop okay

we're good all right we can release fuel

filter like

so all right and place your guesses Down

Below guys is the fuel filter going to

fix this problem I have like no faith

really in anything on this car I've had

so many smoking guns not fix anything

and I don't know let's see if we got

anything nasty in here I doubt

it yeah probably not going to fix it but

maintenance all right let's slide our

new guy in there we go I'm going to be

replacing all the clamps with

traditional HST clamps there we go all

right we'll put our tank line back on

then we have your squirt fuel all over

your shirt line and we'll tighten these

guys

up tighten our bracket up good there

release this I'm going to go wash my

armpit and change my shirt and then

we'll go for a ride but let's see

here oh she's building she's building

fire no there we there we go what's this

going to be at at idle okay we're at

about 55 PSI this is what the sensor

plugged back in let's try this

[Music]

again all right well that's what the

sensor plugged back in and it dropped

down to about 45 so better than the

first time with the sensor plugged in

and the old fuel filter was hitting like

really low 40 so not bad but not good

enough we need to do a fuel pump it's a

2005 it's it's a really old old fuel

pump it could just be worn out we're

going to do this the smart way this time

and actually relieve the fuel

pressure okay I am seriously not having

any luck here people that happened yes a

listen to all this jeez that is kind of

a little Vapor locked isn't it huh all

right almost done hey at least I don't

have to change my shirt again there we

go we're good we're good you know I

didn't just order the fuel filter I I

had no faith whatsoever so I got the

fuel pump from FCP euro.com as well

there we are and this is the factory PG

and from what I understand this is the

same fuel pump that's on the Bugatti

Vyron don't quote me on that but that's

what some people commented and it seems

to be true okay we should have no

pressure now and this is most likely the

original fuel pump there wasn't really a

big issue with these honestly and that's

precisely why mine's bad I just have the

worst luck with this car ever this

Line's going to spew gasoline from the

tank do a little quick switch aoo there

there we

go no

ah I relieved the pressure wear safety

goggles people and masks and just

fullblown biohazard suits when working

on your CL65 I relieved all the pressure

come on people I got to change shirts

again seriously though wear safety

glasses this is bad this is dangerous

don't do what I'm doing right

now okay now I do have the battery

disconnected not that these would be

live right now but this car tries to

kill me at any chance it gets so I

disconnect connected the battery anyway

all right so we have a nut right here

and don't drop the little star washer

thing and one more on this side that is

not an eight at all this side is a seven

so that way you can't mess up power and

ground got it cool and we just have a

Phillips right here and I think this

will slide out this way it's a big big

fuel pump let me tell you there we go

are you bad are you bad probably not bad

all right since I have that side kind of

blocking me I'm gonna sneak this guy in

I like that reinstall the one screw that

holds it in like so and you must use the

world's longest screwdriver every time

you do this go back together with our

electrical connections top wires back on

we're just going to slide this one here

put on our little star washer and what

are these called I don't even know the

proper term I've been calling them star

washers my whole life and we have our

nut give it an Alex torque spec click

and cover these guys back

up last up new clamp definitely do not

need an impact for this

that's good we're going to replace this

guy with a traditional host clamp as

well screwdriver click click click okay

all right we have a new fuel pump a new

fuel filter in any normal situation this

would fix it and yes I have lost most of

my faith in this car but I'm just going

to revive that Faith one last time this

has to fix this low fuel pressure issue

it has to I don't think it's the sensor

we gave it maximum voltage by

disconnecting it this has to be a

mechanical limit

a worn out fuel pump it's got to be I'm

going to go wash up again then we'll go

for ride okay I've reconnected the

battery come on fuel

pump there we go hey no check engine

light that's kind of nice and we still

have our 55 let's just hope it stays

there at wide open

[Music]

throttle didn't kick us out I don't

think it dropped please please please

please please don't drop please please

don't

drop ah Jack engine light flashing Lim

home that literally did nothing here we

are again people got to shut it off

start it again what in the world is

wrong with this car what I don't know I

don't know so something else I've just

noticed is that the AC doesn't work

anymore it worked this morning like on

our initial runs and now it's now it's

just warm talk about like dreams being

shattered in the last 10 minutes fuel

stuff didn't fix it and I have no

AC great another part of this fuel

system that I don't believe they even

make anymore and I found some used ones

for like $400 or $500 is this guy right

here this is basically a voltage box and

it receives its normal battery voltage

through this connector these wires here

go directly to the sensor it reads

pressure and is able to increase or

decrease the voltage depending on the

need so right now the engine is running

and I have both leads on the fuel pump

and we're getting about 6 volts at idle

and check it out and we unplug this the

pump goes crazy and we get battery

voltage at the pump so this is kind of

simulating if we want wide open throttle

it gives the pump Max voltage for Max

output all right guys I got a new shirt

on it's a new day had some time to think

about this it is possible that this

voltage box is bad I've never heard of

one of these going bad but you never

know so right now what I'm doing is I'm

probing the two main power wires from

the car and that feeds into the box and

then the Box will reduce that voltage

down going to the pump or bring it back

up now the Box clearly reads 135 with

the sensor unplugged so the system at

its maximum voltage we were only getting

about 127 right now I've probed those

two wires coming from the car that feed

the box and we're getting 138 139 that's

over a 1vt drop through the box and

that's with no load it's possible the

pump is trying to draw more and there is

an internal issue with this voltage box

that's causing the problem it's possible

I hope fingers crossed here and just for

a good measure we'll check the voltage

at the battery yep 14 volts we're

definitely losing a lot here we're

losing voltage and we need it we need it

for that pump all right guys I've rigged

up some wiring here for some testing so

we have our ground and our power and

we're going to run this wire into the

car with our meter and I want to watch

this voltage under load I'm okay with

the new fuel filter we needed that for

maintenance I'm also okay with the new

fuel pump it's almost 20 years old so

I'm good with that but we really need to

diagnose this voltage box because like I

said they don't make it anymore it's

$400 used and who knows if you're get a

new one if it's bad we got to do what we

got to do but I I need to see this I

need to see this with my own eyes Okay

so with our wires in the car here we can

see we're at about 6 volts just curious

we give it some throttle yeah about 6

volts with no load here we go wide open

[Music]

throttle and then it dies out so right

on that run Flash and check engine light

this thing is dead it's not dead it's in

its limp home status whatever it's

really hot out today which kind of

complicates things if the intake air

temp is playing a role in this whole

thing although this fuel pressure is is

not getting up anywhere near where it's

supposed to it's going in lip mode

almost every time it's not really going

over 12 volts so I just pulled the

sensor on there so now look at that we

only have 118 that's really bad but

let's see what happens under wide open

throttle and yes I'm holding this all

together with one hand and driving with

the other that's what you got to do oh

there we go got up to 12 there sweet all

right let's do wide open

throttle yeah 129 is the most it's

getting at but it'll give us a longer

pull with that all right let's see what

we can figure out back at the workshop

you guys want to see something

cool 132 at idle at the pump okay it's

hard to hold the leads on there uh but

we have rigged up the fuel pump directly

to the battery and by rigged I mean

rigged yes yes yes this is what we have

going on so we have wires on the side

fuel gauge tape to the windshield

nothing to see here folks all right

we're going to do a little roller it's

kind of going

crazy

kicked us out fuel gaug is going nuts

though and we're in limp mode

again now it's kind of

[Music]

steady kick this out again ah no change

no change this is ridiculous I don't

know what to say all right I found

something guys I found something that

requires me to drain the entire fuel

tank so we're going to use the gauge

here and since we have have the fuel

pump hardwired I just have it draining

out of the rail right now I think

there's like four or five gallons in the

tank so this shouldn't take too long

fuel pump is done pumping we had this

much fuel left so this is a 5 gallon so

roughly three gallons left so the reason

I drained the fuel tank is look right

there this is the main feed right here

this hose eventually leads to the pump

so this is coming right out of the fuel

tank and I didn't know this but that's a

screen that's a removable screen so what

if that's clogged you saw these a lot on

really old Mercedes like 7s ' 80s '90s

stuff I had no idea a 215 chassis would

have this I even spoke with my Mercedes

shop foreman friend one of my other

dealer Tech friends they didn't know

either they looked it up though and we

found it so another my I don't know how

many times I've crossed my fingers so

far on working on this car but doing it

again or maybe I shouldn't do it I'm

uncrossing the fingers this is going to

be my the peace sign it's going to be my

new Good Luck thing peace no peace so

this is a

22 oh man I can only get a stubby on

here though oh it's turning that's the

only luck I've gotten so far in the last

few weeks of working on this car able to

spin this off with my hand that's

great okay fuel line is out there's a

little fuel can you imagine if this

thing is just clogged up with like dirt

and garbage and that's the actual issue

if that's the issue I'm celebrating I'm

taking my wife out to dinner tonight I'm

not talking like Olive Garden or

something like that we're we're going to

go somewhere

nice maybe just get some deep dish pizza

somewhere all right it is a 3 2 mm got

that on the first try too and we get a

decent amount of room in here okay there

we go now let's see if we can turn this

thing oh it's turning

yeah all right please be super dirty

there's some fuel coming out that's cool

going to clean up our differential a

little there we go please be dirty

please be dirty please be dirty please

don't be totally clean with no issue Sho

whatsoever are you serious right now

there's nothing wrong with this you're

supposed to be clogged what in the world

we're feeding you full power from the

battery what is going on yeah there it

is it looks

fine that really stinks cuz we're not

going out to dinner

tonight so I'll be here for the rest of

my life just going to blow this line out

just in case there's a gigantic piece of

something in

it

nope I can feel the other end it's

perfect let's just clean this

off yay it's just as clean as it was

before I'm going to go ahead and put

this all back together now well even

though this wasn't clogged up the thread

stripped out this is aluminum but the

dealership had one that was only a day

away so we have a brand new one going in

and hopefully this guy just Reds in the

other one had me scared cuz that would

be a fuel tank placement job if this

well if this doesn't work oh yes all

right before I could only get like a

half a turn okay we're going to be good

I'm going to put this all back together

put some fuel in it and we'll continue

on well as you could imagine that didn't

fix it at all I went for a ride it did

the exact same thing so I'm draining the

fuel again but I'm back with High Hopes

yet again with the CL65 I think I may

have another solution the fuel pump in

the CL65 is from the Vyron which makes

over 1,000 horsepower so I didn't think

we simply had a lack of fuel pump issue

also many claim this pump is good to 800

horsepower but I found out the Veyron

uses two fuel pumps the people claiming

one can produce 800 horsepower are

typically running them at a much higher

voltage and seeing as how this car is

monitoring the fuel pressure I simply

can't add a boosta pump like what's on

my Cobra to increase the voltage as it's

very possible the car would freak out

and set a code and then go into limp

mode and scen as how replacing this fuel

pump didn't fix the problem we know that

the original one is good so we're going

to copy the Veyron and just add another

fuel pump I've already started the

wiring so luckily we have a battery in

the trunk here on the SE which isn't too

far away from the fuel pump so we're

going to add a gigantic relay and a nice

fuse strip this guy and we'll add this

terminal excellent and this is going to

be our main power coming right from the

battery now our fuel pump should never

pull over 16 amps so I'm using a 20 amp

fuse for protection all right nice and

accessible as well then you know I love

my command strips for relays so we don't

have to drill into anything keep it

clean we're going to snip these little

ears off too there we go and what's nice

is we can put this right onto the

battery and these things are meant to

hold like I don't know 20 lbs or

something so this relay weighs

practically nothing so this is very nice

and secure now because I don't want the

cl to know that we've done this fuel

system I am stealing what's called a hob

switch from the Cobra and yes I'm still

working on the Cobra I'm just waiting on

parts right now but uh I ordered a new

hob switch it doesn't come in for a

couple days there we go but this is what

we need so the hob switch is a boost

activated switch so as soon as we get

over 4 PSI this will make a connection

inside and complete the circuit for our

relay so it kicks on the fuel pump

because I want the cl to run and drive

just with its normal fuel system at all

times then when we go wide open throttle

this kicks on our secondary fuel pump

the car should have its full fuel

pressure at that point and the car's

computer shouldn't know any different

first we got to see if this works so

right now it's electrically open and

when we give it some boost you hear the

beep there we go okay cool hop switch

works very basic part they're only about

20 bucks too now I have our signal wire

going all the way through the car back

to the trunk and I've already connected

our terminal so we'll slide one on here

and one here doesn't really matter which

one goes where and we're using a factory

hose off of one of the intercoolers as

our boost reference and we have it teed

off to the factory map sensor which

rests right here anyway and then I found

a little connector I think from the

Grand National that'll slide right over

here so Cobra and Grand National Parts

on the Mercedes naturally and I ran the

signal wire underneath the beautiful

Chrome AMG seill plate and then into the

trunk right here so it just needs to

connect to the signal going to the relay

so now we can connect our hob switch in

like

so all right melt that in looking good

make it extra professional with a little

heat

shrink all right wiring is done and now

we could say goodbye to all of this with

a very nice and thick piece of

Mercedes-Benz carpet there we go oh

don't forget the little there we go

that's good here's the hob switch and

the factory map sensor connected I'm

completely done with the fuel system

outside of putting fuel in it and

checking for leaks but check this out if

you guys want to add a second Bugatti

Veyron fuel pump to your Mercedes 65 car

you don't have to hack up the factory

system at all so this is the factory

feed line coming from the tank this is

the one that connected up to that filter

that we replaced and what I bought was a

brass y Barb fitting so we have the feed

going in here this is a 5/8 and then we

have a couple pieces of fuel rated hose

going right to the inlets of the pump so

this is very very low pressure this is

just gravity fed from the tank and the

pumps will suck the fluid over this way

way and then I added another y Barb

right here and that takes the outlet of

the pumps this one and this one puts

them into two and then throws them into

the fuel filter just like Factory and

then everything is connected and ran

well just like Mercedes intended from

here so the fuel now coming from both

Bugatti pumps goes in here out of the

fuel filter and these lines are all

untouched and then it runs to the front

of the engine I did move the voltage box

over a little bit so I could fit the

pump nice and snug right in here that

way our plastic cover fits but the car

is going to run just like it does from

the factory it's not going to know that

it has a second pump so we're not going

to get any lights or any issues with

this then once the switch under the hood

senses over 4 PSI of boost it's going to

make its connection send power right

from the battery to our second fuel pump

and and the rest is is history hope

hopefully let's see if this even fixed

it now before I go ahead and install

that plastic cover that goes in the

bottom I want to check for leaks here

so this thing pretty pretty full was

kind of an awkward little way of holding

this isn't it this car will go through

this 52 gallon jug and like 10 minutes

worst gas mileage ever so what was that

stat that they talked about a lot when

the Bugattis first came out that it can

go through an entire tank of fuel in

like 13 minutes at wide openen throttle

going like 200 M hour whatever it was I

wonder if the CL can do that

now I'm just going to Prime the fuel

system okay we're good there and it

doesn't look like we have any leaks yet

I just want to hear that secondary fuel

pump kick on so we'll jump this oh

yeah yeah it's running all right no

leaks so far so

good she back she's back hopefully she's

really back with all of its power all

right everything is looking great guys

awesome we put our cover back on oh yeah

fits perfectly awesome I mean I

definitely tested this before I mounted

the pump there of course now you can't

tell we did

anything guys I'm so nervous right now

you don't understand every time I think

I fix something on this car and I'm

about to go for a drive I'm just so

nervous because the disappointment that

could ensue if it's not fixed but man

let me tell you I am going to be

celebrating if this thing doesn't drop

fuel pressure and the check engine light

and all that oh my gosh all right guys

it's not summer the weather's not the

best but as long as this fuel pressure

doesn't drop we're good and I do have a

Dyno appointment set aside just just in

case this works let's see all right

let's see what we got here we go I'm

getting into it right now hasn't kicked

us out yet all right all right uh it

didn't go into limp mode it stayed I

think around 55 to 65 something like

that which is acceptable okay let's

let's do it again all right I want to

get a really good test

here oh ripped them woo oh yeah all

right oh that was nice that was nice all

right guys I'm in manual mode here and

I'm bringing this up in RPM let's see oh

feels good guys oh yeah

woo all right cool I can't get too crazy

here it's starting to rip the tires

loose but yeah I mean it's so far it's

pulling you know I've done this a few

times now and it's it's nice with the

additional fuel pressure that makes a

lot of sense if the fuel pressure was

dropping down to below what the sensor

thought was acceptable it would throw

the car into limp mode which doesn't

make sense as why the car doesn't give

me a code for low fuel pressure but who

knows it's an old Mercedes computer I

don't know but it is feeling pretty good

yeah it feels nice I will say this

though guys I remember these cars being

just a little bit faster like it does

still feel a little bit choked up to me

and I I have a theory behind that I

think the catalytic converters might be

slightly clogged if you guys remember

many CL videos ago I had a hydrolock

situation an injector stuck wide open

and so it's possible that it clogged up

that cat or did something to the cat so

anyway let's let's see what's going on

with the cataly converters all right

guys I'm going down the path of clogged

catalytic converters right now so what

we have going on here is a voltage

reading from the front o2s so this is

Bank One Sensor One this is Bank One

sensor two and then Bank two sensor one

and sensor two these guys right here

should pretty much be flatlined around

like a half volt something like that if

we're just normally cruising around so

everything looks good now and you can

see here on Dell everything goes to zero

because it shuts down fuel on diesel so

that's normal now we're back in

[Music]

it and yeah okay so you can see that

this bottom sensor right here is pretty

much just staying exactly the same and

this sensor here the other rear 02

sensor is moving a little bit with bank

one I know this is all confusing and

weird right now but basically we have

one rar2 sensor that's doing something

different than the other one which could

coincide with a clogged catalytic

converter all right so I've let this car

cool down for a while and we are going

to remove the entire exhaust system to

take a look at these cats and look what

I'm up against people look at that vband

right there that bolt seems okay that

one I don't even know where it is oh

it's not going to break good job whoever

put this together the other one was

actually super easy with a

swivel we're good I got the bolts out of

this this side as

well okay cool yeah it's V banded so

that's pretty nice right on the turbo oh

we get we'll get to see what's inside of

there all right all of this should come

apart fairly easy I replaced most of the

hardware when I did the engine like

three years ago all right gotten all the

bolts

out get out okay there we go let's

inspect and see what we see inside of

this cataly converter and maybe clean it

I have both of the exhaust pipes and the

cataly converters out and in the wash

bay let's take a boroscope peek inside

and all right it's a little bit spotty

in here kind of dirty let's check the

other one yeah I've definitely seen

worse but you can see it is slightly

clogged and when you're talking a V12

engine with a couple of turbos it can be

sensitive to back pressure and and this

could cause more back pressure so let's

clean it out when I worked for the city

of Chicago we were maintaining a fleet

of like literally tens of thousands of

vehicles and the cats were expensive and

sometimes they would get dirty and we

would clean them this also happened a

lot with the DPF filters on diesel

vehicles so if you guys remember a

couple videos ago I used this release

all service cleaner on the inside of the

C4 tail pipes and it cleaned the soot up

basically right away so I'm going to

spray some in here we're going to

pressure wash it and see what happens we

would just use normal deaser at the

sitting it worked

well yeah we're just going to fill this

thing up this foam's really nice and

we'll get this one as well what's nice

is we have access to the middle of the

cat right here oh

yeah this is great oh

man release the

soot all right I'm really loading this

thing up I want to see if anything will

even come out anything oh man that's

crazy I put a lot in there too nothing's

coming out of this thing might be really

clogged pressure washer

time oh man you can just like feel it's

clogged up already all right some of

it's coming through though well that's

nice so curious to see what this is

going to look like with the boroscope

afterward but we're definitely getting

through

[Music]

now wow look at this guys we're getting

a ton of soot out yes it's the old

Italian tup look at this that is all

soot nice watch what happens when I

spray it in

here it starts puking out the front woo

oh yeah look at

that

this is awesome so

satisfying doing it through here is what

really agitates it I

think there we go get out all right this

is going to take a while I'm going to

keep going here and then we're going to

Boris scope and see if it looks any

better oh and this release all Surface

Cleaner is really great and you can use

it on almost everything it's made in

Wisconsin and the owners are really cool

they gave me a coupon code for 10% off

so I'll leave that in the description

box for you I have rinsed out these cats

for a very long time we don't have any

more soap coming out a little bit of

water trickles out every so often so I'm

going back together with the o2s and

check this out my air blower fits

perfectly into the

exhaust a look at that stuff comes out

all the time it's crazy oh my God I

swear I've rinsed this out a million

times but uh this is a horrible

unscientific test but this flows really

really well air is coming out I think

we're good and here's what the inside of

the cats look like they both look the

same now and that's a beautiful thing

and you can see kind of the light

reflection in there from the camera so

light is going right through I think

we've cleaned these up pretty well so

I'm going to bolt the exhaust back up

and and we're going to you know test it

another another spirited test drive all

right you know I got to start this thing

up with open turbos right I mean how how

do you not do that what is it going to

sound

like

wow I was not expecting

that that was kind of weird

huh can definitely hear those turbos

though there we go turbo spinning away

we know those are working but man did

you guys expect it to sound like this it

kind of sounds bad like I don't I don't

like this at all obviously you never run

it you know with open turbos but weird

right got to say the seal exhaust is

actually pretty light considering it's

massive massive size and luckily fairly

easy to

remove there we go going back together

is just absolutely

horrible the angles the angles to

tighten up this vband see right there I

mean what in the world look at that look

at what I got going on with this

extension

swivel it's For the Love of the Game

people the Love of the

Game all right everything is tight this

is my last piece of

Hardware we're back together people and

this is a base tune file that we're

uploading right now and this is specific

to all the mods that I've done to this

car so I gave the tuner the information

on the larger fuel injectors the hybrid

turbos the ported heads uh and I think

that's about it and uh yeah should be a

pretty good base tune all right exhaust

is back together tune is

done

runs like a champ yeah yeah yeah service

[Music]

whatever with the new tune it lets us

rev it up higher in park or neutral and

we're getting a ton of more turbo sounds

and uh that could be the freed up

exhaust too guys I'm feeling good I'm

feeling good guys look at all that

that's all the water that is just

steaming out of the exhaust that's

awesome we really cleaned it all right

I'm going to I'm going to let that bake

for a while get all that steam out of

the exhaust and then we'll hit it and

see if it you know if it works all right

I had to drive it around for quite some

time before all of that smoke went away

but let's see if it feels any better oh

yeah

wow that pulled guys that pulled that

felt way better let's do it again well

it doesn't matter how fast we're going

either that's what I love about the V12

that feels

great

okay I got to be really careful because

it is wet outside and it just rips the

tires very controllable though this car

I must say um but yeah that feels a lot

better and a dead giveaway for me at

least for the cats being clogged was how

different this car sounded right when we

first started it up I'd never heard the

turbos and the blowout valves and stuff

like that at idle so yeah I definitely

think that helped um and this is

something you guys can try at home as

well guys if you have a cat that you

suspect to be bad or clogged um and you

have to take it out anyway if it's not

too big of a project to reinstall it try

cleaning it out it it could fix it

sometimes not always but sometimes I'm

going to drive home tomorrow morning we

have an appointment at Cannonball garage

on the dyno I'm feeling pretty good it

has hasn't gone into limp mode in quite

some time now we have good fuel pressure

we have a cleaned out exhaust so fingers

crossed for tomorrow Cannonball Dino

time I made it to Cannonball this is

about 45 minutes away from my house the

car was Flawless it is of course raining

again but that doesn't matter because we

are on a dyo and Stan is about to fire

this thing up so we can synchronize

RPM sounds so good guys I don't want to

do exhaust on the CL honestly I think it

sounds just so good Factory especially

for this kind of car you guys you guys

heard it without the exhaust I I don't

know I don't want to risk anything like

that it sounds great like this we are of

course in dyo mode so all of the nannies

have been turned off we are also in

manual mode for the

transmission so what he does to

calibrate it is he gets it to 4,000 RPM

holds it and that's it I'm going to be

doing some logging with my computer so

right now I'm looking at upstream and

downstream map sensors this has both we

have our wide band this is my portable

one so I can stick the sensor in the

tailpipe and Stan is in the driver's

seat and we'll see what happens we're

just going to do a a light run at first

and feel it out got to be gentle with

the CL gotp speed m275 oh and this is

not all-wheel drive all right it's an

all-wheel drive dyo it's just how it's

going to

look

that was

[Music]

quick sounded weird check engine light

oh no no no no no no no don't tell me

that oh jeez ah you got to be pitting me

guys it uh it did the same thing it

kicked him out 280 horsepower great

what you got to be kidding me it did it

did the same thing like it doesn't

actually make 280 horsepower it did the

cut you know this is insane like I'm I'm

able to rip it like through first and

second gear pretty good uh you know I

can't test third gear and and stuff like

that in this rain especially you know

it's been difficult but what in the

world we're going to try it again I'm

going to look at the log that's funny

470 foot lbs of torque at like 3,000 RPM

this is why it feels like halfway decent

on the street but yeah I don't know man

I don't know if this thing feels the way

the it should feel to be honest with you

it's been so long since I've driven a

properly operating V12 the power

delivery is a lot different on these

things it's not like The Supercharged V8

cars that just rip you know instantly

these things are more like a rocket ship

so I don't know I don't know runs

beautifully right when you shut it off

and start it off again it's it's fine I

got to say this looks weird to me

pressure of the downstream map sensor

that's what that is and we're at 4.6 PSI

Upstream so before the throttle body is

at atmospheric which that makes sense

this should read vacuum I would I would

imagine and these two other pressure

sensors are in the airboxes that would

be right here and right here and those

should be reading atmospheric right now

as well so this is the one that has a

weird reading and it is a new sensor

I've replaced so much on this car when I

did the engine job while I was in there

well let's

record bam all right I'm going to watch

all of this live as well air fuel these

should

equalize there we

[Music]

go we did it again did it again all

right whatever none of these numbers

mean anything 320 horse doesn't matter

it did go Rich there which is weird

because I have tested air fuel on this

car many times before and it was running

just normal like in the 11s it did go

Rich there before it cut out but it did

cut out yet again this is so crazy that

this is like an intermittent thing now

because sometimes it doesn't kick you

out I don't I don't get it I don't know

if under more load and it's going Rich

all right so right now I'm going to move

the Freeze Frame data so we can see what

these pressure sensors are doing so

let's see where is Full Throttle it

should be right here I didn't pull it

too high this is wide open throttle

right here

the two pressure sensors are reading the

same which is normal that that's good

now I have checked manually and the car

is only making about 15 or 16 PSI of

boost the pressure sensors are reading

21 though in the computer now that could

be a translation issue with my computer

because it's not really making 21 22 lbs

of boost which that's what it should be

making 15 is low but I've used a

mechanical gauge like a known good gauge

just stuck on the windshield like I did

with the fuel pressure and 15 is maybe

16 is the most and that shouldn't be

adding atmospheric at that point so that

should be a true reading as well all

right guys I just want to see if we have

something maybe going on with the

throttle body uh I have definitely

checked that actual value as well in the

computer when I floored it is saying

that it is wide open but what if it's

actually not so even though our pressure

readings from the upstream and the

downstream sensor are equal and they

seem to be normal I am really just

suspecting a throttle body issue at this

point and I just want to physically

watch this thing move so I've removed

the Y piece so we can do

that all right when you start it up you

can barely tell this thing is open

that's

normal let's open it

up all right go a little

more it's

opening oh yeah all right that

works I mean this thing is making boost

feels very equal on both sides the

intercooler everything seems normal man

this is very frustrating guys very very

beyond frustrated at this point I I

don't even know what to say our sensors

are reading fine the throttle body seems

to be working

fine no codes I mean what in the world

it runs so good it just you can drive it

you know from here to California it'd be

fine it's just wide open throttle for an

extended period of time has the issue

intermittently all right everything is

back together under the hood and it

keeps on doing the same thing so at this

point uh I'm kind of just dead in the

water here on the dyo uh it could be a

bad throttle body I have to now

investigate why it's going so rich when

it never would do that before when I was

testing this a few months back with the

same issue before it would cut out it

wouldn't go RI it would it was just fine

AFR was good and now we have that thrown

into the mix as well so I don't know

what to say guys I just uh I don't know

I'm going to ponder life right now I

found a map gas torch here at cannibal

hey Stan is that is that gasoline yeah

why can I borrow

that this will fix everything all right

guys obviously I'm kidding I'm not going

to burn this car down or am I this would

make my life much much easier but in the

end I always just go back to uh working

on this car so I think think at this

point after speaking to the guys at

modern Master speaking to OJ at fluid I

mean we've all been bouncing ideas

around like crazy I think I just need to

drop this off at a dyo with a tuner and

kind of go from there unfortunately the

tuners are mostly all remote so the one

that has been sending me base file for

this one is in a different country it's

very difficult to communicate in time

zones and all that but yeah I I think

that's that's where I'm at but you know

what I think I'm going to try a throttle

body before that I don't know you can

see guys I'm just I'm already thinking

I'm already going to be continuing on

working on this car so I am so sorry

that I didn't fix it in this video that

definitely was my intention about 5

months ago when I started filming this

but yet again this car has disappointed

me I I thinking about getting some

specialty plates that just say

disappointment anyway guys um before I

burn this car down I'm going to let you

go I uh thank you for watching this

video I don't even know what I say at

the end like it share it subscribe all

that good stuff say a prayer and uh I'll

see you hopefully in a way more happier

ending of a video next

[Music]

time could just be that they stamped AMG

on there and then and then everybody's

able to

charge it could be because they just

stamped from what I understand this is

the same fuel pump that's on the Bugatti

shayon shayron bayron what's the first

one veyon yeah so this is kind of

simulating if we want wide open throttle

the sensor so this is kind of simulating

if we want wide open throttle the pump's

going to give it more juice so this is

kind of simulating if we want wide open

throttle and it's just giving the pump a

ton of juice so this we were only

getting with the sensor unplugged so the

system add its mol I don't know why

I'm I don't know why

but good let me try that again now this

fuel pump should never pull more than 16

amps so we're going to protect this with

a

now this fuel pump

should now our fuel pump is in case

you're wondering uh what I'm filming

here it's this thing it says boost

a pump here we go all right I'm

completely I'm completely done with the

fuel system outside of checking so let's

put this so let's put the exhaust back

together and go for a ride fingers

crossed

yay second so let's put this so I'm

going to put the exhaust back up so

let's B this exhaust back on the car and

see if we have more

[Music]

something