Help with my symptoms. Belt slip?
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 261
Likes: 32
From: Where the Army sends me.
GL 350 Bluetec
Help with my symptoms. Belt slip?
When under full throttle sometimes the car will have a loss of acceleration when im over 4500 rpm. It is sudden and then the car will have full acceleration again. Like I have had some sort of fuel cut off point or supercharger disengaged or something, maybe even a misfire. Like I said it will lose power then it will return immediatly on its own. It doesnt happen every time I floor the car, just occasionally. There are no CELs or any other warnings on the dash. Even tried turning off ESP to make sure it wasnt that. Been searching and reading old posts and couldnt come up with an answer.
I have replaced my stock IC pump with a CM30. The symptoms are much different than a bad IC pump, this is a sudden violent loss of acceleration then everything comes back. Doesnt sound like glycol contamination either, this is only at high rpms under full throttle. Throttle position sensor, maybe... but it is intermittent and car runs fine the rest of the time.
Im kind of leaning towards a belt slip. I replaced the belt when I did my pulley kit about 2k miles ago. What are the thoughts of the other c32 owners.
I have replaced my stock IC pump with a CM30. The symptoms are much different than a bad IC pump, this is a sudden violent loss of acceleration then everything comes back. Doesnt sound like glycol contamination either, this is only at high rpms under full throttle. Throttle position sensor, maybe... but it is intermittent and car runs fine the rest of the time.
Im kind of leaning towards a belt slip. I replaced the belt when I did my pulley kit about 2k miles ago. What are the thoughts of the other c32 owners.
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 261
Likes: 32
From: Where the Army sends me.
GL 350 Bluetec
No not 120+ mph. Like, at the end a highway onramp is when its happening, so top end of 2nd and 3rd gear. Dont have anywhere to go to the top of 4th lol.
Senior Member
Joined: Jul 2009
Posts: 392
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From: Northern Suburb of Indianapolis
CLS55
I know you said you already reaplced the pump...but to me that's exactly how my car acted with a bad one. It was sudden and violent, I'd floor it and then it was like someone put on teh brakes...my head would even bob forward, then after that I could hammer the peddle and it just would really take off (no S/C).
That said, you're probably right that its not, but the new pump could have failed (however unlikely) but just to make sure test this out with a cold car and see if you get the same issue, if it only occurs after a little bit of driving, then maybe it is the pump.
That said, you're probably right that its not, but the new pump could have failed (however unlikely) but just to make sure test this out with a cold car and see if you get the same issue, if it only occurs after a little bit of driving, then maybe it is the pump.
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 261
Likes: 32
From: Where the Army sends me.
GL 350 Bluetec
I had a bad pump, hence I replaced it. This feels much different. Maybe it is still something IC pump related. Pump not turning on when it should and thats why it is doing it when I first get on the highway. Or maybe a flow issue. Edit: I have made sure I hit enough RPM before entering the highway to ensure pump should have turned on.
It is kind of hard to recreate the problem thats why I am having a difficult time describing.
It is kind of hard to recreate the problem thats why I am having a difficult time describing.
Last edited by Panzerknacker; Dec 18, 2009 at 11:48 AM.
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From: Isla Verde, Puerto Rico
SRT-6
ESP can cause what you describe, even turned off. Depending on the RPM, if you get too much wheel slip it will intervene (cut power drastically) or up shift early. At least that's how my SRT-6 reacts. I have a data logger which is how I found out what was going on. I hope thats all it is.
Les
Les
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From: PA
S600, GL450, GLC 43
What pulley did you go with?
It sounds VERY similar to an over boosting symptom, where the engine would shut down. Then it would come right back, because the sensor no longer sees boost.
Another, potential issue, could be HIGH IAT's due to the new boost, hence it pulls timing like a freight train, and as soon as you go back, it has power. So do you still have the stock HE?
Note: Over boost does throw a CEL.
When in doubt, call Jerry or Jake at Eurochrged. They have experienced it all on a C32, trust me
, and they are VERY happy to help a fellow nut
One more note: If the belt was slipping, you would see black residue around the blower pulley fairly easy. Also, it would not shut off so to speak, it just wouldn't pull as hard. A shut off is something from the ECU I would wager.
It sounds VERY similar to an over boosting symptom, where the engine would shut down. Then it would come right back, because the sensor no longer sees boost.
Another, potential issue, could be HIGH IAT's due to the new boost, hence it pulls timing like a freight train, and as soon as you go back, it has power. So do you still have the stock HE?
Note: Over boost does throw a CEL.
When in doubt, call Jerry or Jake at Eurochrged. They have experienced it all on a C32, trust me
, and they are VERY happy to help a fellow nutOne more note: If the belt was slipping, you would see black residue around the blower pulley fairly easy. Also, it would not shut off so to speak, it just wouldn't pull as hard. A shut off is something from the ECU I would wager.
Last edited by MRAMG1; Dec 18, 2009 at 12:28 PM.
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Thread Starter
Senior Member
Joined: Apr 2009
Posts: 261
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From: Where the Army sends me.
GL 350 Bluetec
I have a LET 185mm pulley, and I am running the stock HE. The thoughts had crossed my mind that it could still be reaching a IAT that was too high, or a boost level that the engine didnt like.
There are no CELs.
There are no CELs.
Super Member
Joined: Apr 2008
Posts: 618
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03 c32
FWIW - I have experienced the EXACT same issue as you have described, and have replaced every part under the sun to try and problem solve what is happening.
I am also running a belt wrap kit.
After speaking with various tuners, and spending well over $10K in the past 6 mos., the end result has been over boost...
Let's figure this out. The car runs fantastic 99% of the time, with the exception of this intermittent "hiccup" under WOT at the top of 2nd or 3rd...
I am also running a belt wrap kit.
After speaking with various tuners, and spending well over $10K in the past 6 mos., the end result has been over boost...
Let's figure this out. The car runs fantastic 99% of the time, with the exception of this intermittent "hiccup" under WOT at the top of 2nd or 3rd...
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 261
Likes: 32
From: Where the Army sends me.
GL 350 Bluetec
FWIW - I have experienced the EXACT same issue as you have described, and have replaced every part under the sun to try and problem solve what is happening.
I am also running a belt wrap kit.
After speaking with various tuners, and spending well over $10K in the past 6 mos., the end result has been over boost...
Let's figure this out. The car runs fantastic 99% of the time, with the exception of this intermittent "hiccup" under WOT at the top of 2nd or 3rd...
I am also running a belt wrap kit.
After speaking with various tuners, and spending well over $10K in the past 6 mos., the end result has been over boost...
Let's figure this out. The car runs fantastic 99% of the time, with the exception of this intermittent "hiccup" under WOT at the top of 2nd or 3rd...
But really to use a smaller pulley than a 185 would be an option. Or increase the amount of boost you hit before the ECU plays ref with your tuning. Although then you run the risk of damaging the motor. But MRAMG1 said over boost would cause a CEL and neither of us have one.
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From: PA
S600, GL450, GLC 43
The fix would be to run less boost lol.
But really to use a smaller pulley than a 185 would be an option. Or increase the amount of boost you hit before the ECU plays ref with your tuning. Although then you run the risk of damaging the motor. But MRAMG1 said over boost would cause a CEL and neither of us have one.
But really to use a smaller pulley than a 185 would be an option. Or increase the amount of boost you hit before the ECU plays ref with your tuning. Although then you run the risk of damaging the motor. But MRAMG1 said over boost would cause a CEL and neither of us have one.
Please contact Jerry on an over boost question. Jake and him are VERY knowledgeable on this issue. My statement on a CEL for over boost, is based on other posts from people on this forum. PLEASE use Jerry and Jake for issues. They really are great guys that live for our toys.
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 261
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From: Where the Army sends me.
GL 350 Bluetec
Gentlemen:
Please contact Jerry on an over boost question. Jake and him are VERY knowledgeable on this issue. My statement on a CEL for over boost, is based on other posts from people on this forum. PLEASE use Jerry and Jake for issues. They really are great guys that live for our toys.
Please contact Jerry on an over boost question. Jake and him are VERY knowledgeable on this issue. My statement on a CEL for over boost, is based on other posts from people on this forum. PLEASE use Jerry and Jake for issues. They really are great guys that live for our toys.
MBWorld Fanatic!
Joined: Jan 2007
Posts: 3,342
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From: PA
S600, GL450, GLC 43
I hope you get it straighten out my fined
Good luck, and happy holidays
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From: Corona, CA
03 g35 coupe...........02 c32 Sold
if you overboosted you would get a cel. If your on stock spark plugs, then its probably your gap. I had similar issues, it was really bad to the point where i misfired at 120mph. The solution is to get smaller gap spark plugs. Preferably .34-38 gap. I just changed mine out today...hopefully i can test it out in the dyno...soon
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From: North NJ
2002 C32 AMG, 2013 GLK 350/4, 2015 E63S AMG Wagon
Is there any way you can do some live data logging? There is a little under $100 gizmo from http://www.carchip.com/ that can log basic OBD2 data including MAP readings. I run a 181mm pulley and only once got the over boost CEL during some runs at Atco this past November. But the CEL does come up when you usually get to the 22+ PSI area.
Thread Starter
Senior Member
Joined: Apr 2009
Posts: 261
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From: Where the Army sends me.
GL 350 Bluetec
Here is the response I got from Jerry. He is helpful and knowledgeable. Ill send my ECU back to them when I get a chance.
You are hitting trq limiting. Your ECU will need to be sent in so we can remove the trq limiters.
The blower is cutting out when you hit the upper trq limit. The easy way to check this is to plug in STAR and see if you have a "load limit active" code in the ECU. An OBDII scanner will not pick this up.
Good news is that you are hitting the over 400ftlbs and the tranny doesn't like it.
The bad news is that you have to send in your ECU again so we can remove it.
We don't do it to every ECU because it is something that only WE can do. No other tuners do this.
Thanks
The blower is cutting out when you hit the upper trq limit. The easy way to check this is to plug in STAR and see if you have a "load limit active" code in the ECU. An OBDII scanner will not pick this up.
Good news is that you are hitting the over 400ftlbs and the tranny doesn't like it.
The bad news is that you have to send in your ECU again so we can remove it.
We don't do it to every ECU because it is something that only WE can do. No other tuners do this.
Thanks
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2004 C32, 2006 Honda CBR1000RR, 2007 Harley NightRod, 2013 Harley Road Glide Custom
Bob
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From: SO CAL
AMG
if you overboosted you would get a cel. If your on stock spark plugs, then its probably your gap. I had similar issues, it was really bad to the point where i misfired at 120mph. The solution is to get smaller gap spark plugs. Preferably .34-38 gap. I just changed mine out today...hopefully i can test it out in the dyno...soon
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From: san jose, ca
2002 C32 1987 190E 2.3 334K miles and going
yet again.
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From: Corona, CA
03 g35 coupe...........02 c32 Sold
i havent tested yet... i blew a gasket or seal a couple of days ago. So i gotta wait till its fixed.
