C32Berg

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

Dingleberry

intercooler pump

TemjinX2

yup check that first.

loudandheard

Definitely check the pump or more like replace it.

evilsaint

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

loudandheard

Mine would still turn on, but some thing was either clogged or the pump was working at its best.

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.

C32Berg

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

Gramma_Benz

You should either buy a code reader and see if you have any pending codes stored. Could be something to do with your Throttle Actuator or pedal assembly. Sometimes some of these errors don't trigger a CEL, but store "pending" codes that can be read to help troubleshoot.

Good Luck!

C32Berg

...I will let the MB shop have a look on Thursday and see if they can find out what's wrong. I keep you posted....

gt4awd

The pump is an intermittent problem. When it starts to go it will work almost all the time with occasional cut out. The symptoms will continue to get worse. When the pump on mine was shot highway speeds effectively cut out the most. There's the difference between an electrical component of the pump failing, and the electrical brushes wearing out due to normal wear. How many miles does you C32 have?

ali saklaoui

This is the IC pump or the charge air temperature sensor faulty(internal short cicuit)

C32Berg

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.

gt4awd

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

Dingleberry

C32Berg

...just kidding correct conversion from metric shall be 60K miles...

C32Berg

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.

gt4awd

I believe you can move the rubber coupler piece onto the CM30, and the original bracket setup can be used.

C32Berg

...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

C32Berg

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....

c32used

+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.

merc4ever

det kunde du ta på det svenska forumet så kunde jag hjälpa dig direkt

C32Berg

I will do that, thanks for the advice

C32Berg

...just trying to broaden my MB network..

60n5pt1

REPLACE the IC PUMP! just do it
Classic symptom.

W203Ramos

@c32berg...very simple job about 45 min with a six pack of beer