intermittent power cut off situation - root cause?
#1
Junior Member
Thread Starter
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![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
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
![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
Drive safely and enjoy the Eastern holliday / Goran
#5
Super Member
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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#6
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Join Date: Mar 2007
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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 ![Wink](https://mbworld.org/forums/images/smilies/wink.gif)
![Wink](https://mbworld.org/forums/images/smilies/wink.gif)
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.
![drive](https://mbworld.org/forums/images/smilies/driving.gif)
#7
Junior Member
Thread Starter
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
![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
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#8
MBWorld Fanatic!
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![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
Thanks
![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
Good Luck!
#10
MBWorld Fanatic!
Still, I thought the IC pump was somewhat 'digital' either it works OR not not.
Last edited by gt4awd; 04-03-2010 at 12:27 PM.
#12
Junior Member
Thread Starter
Thanks for the comments and update. I have got approx. 160K miles on it today and does not know if the IC pump has been replaced by previous owner.
#13
MBWorld Fanatic!
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; 04-06-2010 at 12:33 AM.
#14
Super Member
#16
Junior Member
Thread Starter
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.
#18
Junior Member
Thread Starter
...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
![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
Thanks for all good input & advice
#19
Junior Member
Thread Starter
USD75 was too good to be true.
It is actually 175 USD for the Johnson pump here in Sweden. You guys get a good deal over there....
It is actually 175 USD for the Johnson pump here in Sweden. You guys get a good deal over there....
#20
![Exclamation](https://mbworld.org/forums/images/icons/icon4.gif)
+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.
#21
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![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
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
![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
Drive safely and enjoy the Eastern holliday / Goran
#22
Junior Member
Thread Starter
![Smilie](https://mbworld.org/forums/images/smilies/smile.gif)
#23
Junior Member
Thread Starter