I Used Bugatti Veyron Parts & An Alex Trick To Fix My CL65 AMG V12! You Won't Believe What Happened!
Summary
TLDRIn 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
🛠️ 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.
💳 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.
🛢️ 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.
🛠️ 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.
🛢️ 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.
⚡ 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.
🔧 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.
⚡ 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.
📈 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.
😔 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.
Mindmap
Keywords
💡CL65 AMG
💡limp mode
💡fuel pressure
💡misfire
💡throttle body
💡fuel filter
💡fuel pump
💡catalytic converter
💡base tune
💡dyno
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
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