intermittent power cut off situation - root cause?
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Junior Member
Joined: Jan 2009
Posts: 42
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From: Sweden
GLK 320CDI - 2009 / SL500 - 2003
intermittent power cut off situation - root cause?
I turn to the C32 community with a problem that I have experienced recently when driving my C32. Ocasionally I feel that the power is cut off for a second, not more. It happens at speeds at 60 mph or above and can be under acceleration OR at crusing with or w/o the cruise control engaged. I can drive for miles w/o feeling anything and then suddenly this power cut appears. No alarms are triggered or faults are detected on the screen.
Before taking the car to the MB shop I thought I turn to you guys to see what you have to say. My own thoughts are:
- some fuel delivery problem
- MAF HW problem
- some engine mgm problem (I run Kleemann stage 1 HW & SW)
Your comments and thoughts are greatly appreciated
Drive safely and enjoy the Eastern holliday / Goran
Before taking the car to the MB shop I thought I turn to you guys to see what you have to say. My own thoughts are:
- some fuel delivery problem
- MAF HW problem
- some engine mgm problem (I run Kleemann stage 1 HW & SW)
Your comments and thoughts are greatly appreciated
Drive safely and enjoy the Eastern holliday / Goran
Super Member
Joined: Dec 2007
Posts: 587
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From: The Windy City
'02 C32, '10 135i M-Sport, '10 E63, '17 GLE63S
Get your car warmed up then run it semi-hard for at least ten minutes. Stop somewhere suddenly and shut it off with the right-front window open (optional). If you can't hear a pump turn on and run for a few seconds, then your IC pump is definitely going. It's obviously not exact science, but it's a decent test 
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From: Houston, TX
C32/C55 AMG
Get your car warmed up then run it semi-hard for at least ten minutes. Stop somewhere suddenly and shut it off with the right-front window open (optional). If you can't hear a pump turn on and run for a few seconds, then your IC pump is definitely going. It's obviously not exact science, but it's a decent test
Once I replaced it, my gas mileage decreased. I'm not saying that will happen, but let just say my car had a lot more power on tap more often.
Thread Starter
Junior Member
Joined: Jan 2009
Posts: 42
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From: Sweden
GLK 320CDI - 2009 / SL500 - 2003
Thanks for your input. Still, I thought the IC pump was somewhat 'digital' either it works OR not not. I can drive for long w/o any problem and then I have this strage experience where the power is off for a fraction of a second and then back again within a blink. The probel also apperas in somewhat the other direction i.e. I cruise at a fixed speed at let say 60-70 mph and then without moving teh accelerator the car gest an extra acceleration for a second. It's weird and har to explain....Still, I take your advice and will check my IC pump. Pls recommend the best way to detect if it is OK or not.
Thanks
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From: East Bay, Bay Area
2002 C32, 2012 S550
Thanks for your input. Still, I thought the IC pump was somewhat 'digital' either it works OR not not. I can drive for long w/o any problem and then I have this strage experience where the power is off for a fraction of a second and then back again within a blink. The probel also apperas in somewhat the other direction i.e. I cruise at a fixed speed at let say 60-70 mph and then without moving teh accelerator the car gest an extra acceleration for a second. It's weird and har to explain....Still, I take your advice and will check my IC pump. Pls recommend the best way to detect if it is OK or not.
Thanks
Thanks
Good Luck!
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2005 Pontiac GTO 6.0 LS2 - Blue
Still, I thought the IC pump was somewhat 'digital' either it works OR not not.
Last edited by gt4awd; Apr 3, 2010 at 12:27 PM.
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2005 Pontiac GTO 6.0 LS2 - Blue
How many miles when purchased? I would definitely start with replacement of the pump. Get either Johnson CM30, or Ford Lightning pump. Johnson flows a little more, and appears to be more reliable. Lightning is the same exact pump as OE at 1/3rd the cost. Only difference is the electrical connection, and the pump head. You can pull the head off your old pump, and use it on the Lightning. Directly bolts up. If you want to tackle the pump yourself I wrote up a DIY thread on benzworld.
http://www.benzworld.org/forums/w203...placement.html
http://www.benzworld.org/forums/w203...placement.html
Last edited by gt4awd; Apr 6, 2010 at 12:33 AM.
correct conversion from metric shall be 60K miles...
Thread Starter
Junior Member
Joined: Jan 2009
Posts: 42
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From: Sweden
GLK 320CDI - 2009 / SL500 - 2003
Is the CM30 an direct replacement or what does it take to make it work in an C32? Asking because the Johnson pump is Swedish made and easy to source for me in Sweden.
Thread Starter
Junior Member
Joined: Jan 2009
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From: Sweden
GLK 320CDI - 2009 / SL500 - 2003
...you where right (as always). The intercooler pump needs to be replaced....I will go for a CM30. Swedish made and easily available for the price equal to USD75 from a local rep.
Thanks for all good input & advice
). The intercooler pump needs to be replaced....I will go for a CM30. Swedish made and easily available for the price equal to USD75 from a local rep.Thanks for all good input & advice
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LET C32 2002
+2 if for some reason its not this check the fuse that may be your problem..I had same issue and automatically replaced pump but issue still exist then troubleshooter uncovered that when needed the I/C pump didn't turn on so checked fuse and all good again.
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Joined: Jul 2008
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c32 amg
I turn to the C32 community with a problem that I have experienced recently when driving my C32. Ocasionally I feel that the power is cut off for a second, not more. It happens at speeds at 60 mph or above and can be under acceleration OR at crusing with or w/o the cruise control engaged. I can drive for miles w/o feeling anything and then suddenly this power cut appears. No alarms are triggered or faults are detected on the screen.
Before taking the car to the MB shop I thought I turn to you guys to see what you have to say. My own thoughts are:
- some fuel delivery problem
- MAF HW problem
- some engine mgm problem (I run Kleemann stage 1 HW & SW)
Your comments and thoughts are greatly appreciated
Drive safely and enjoy the Eastern holliday / Goran
Before taking the car to the MB shop I thought I turn to you guys to see what you have to say. My own thoughts are:
- some fuel delivery problem
- MAF HW problem
- some engine mgm problem (I run Kleemann stage 1 HW & SW)
Your comments and thoughts are greatly appreciated
Drive safely and enjoy the Eastern holliday / Goran
Thread Starter
Junior Member
Joined: Jan 2009
Posts: 42
Likes: 1
From: Sweden
GLK 320CDI - 2009 / SL500 - 2003
