Hello everyone. This is my first post. Hopfully you may be able to help me! Two weeks ago, my engine started to cut off @3000 RPM. The transmission shifts normal between 2000-2700 RPM. However, if I press on the gas, it cuts off @3000 RPM regardless of the grea that I am in! When I'm crussing on the highway, it still does not let me go pass 3000 RPM making my top speed 72 MPH. I you guys can give me any inputs I will realy apreciate it. Thanks in advance.
PS. I will be reading the other threads to see if I can put in some of my input!

I forgot:
It is a 1995 C280.

Inky -

I had the same problem. You need to have the Fuel Pump relay checked. This relay switch may have a governor that restricts rpms to 6,000. If so, it has gone bad - I am 99.9% sure this is your problem.

Thanks for the quick response. Where is the fuel pump relay located?

The fuel pump relay on a C280 does not have any decision making capabilities. It is a dumb relay that has its decisions made by the HFM controller.

You should check for fault codes in the HFM and EA/CC/ISC modules.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Thanks Steve - I just saw the first post and didn't realize it was a C280.

Steve: Thanks for the clearing up! Where is the HFM controller located?

Someone told me it might be the OVP. Is that true?

I doubt it. The OVP causes much different problems with the HFM systems. It could cause the car to stop running, but I can't think of any reason why it would do it repeatedly under rpm conditions.

You need to know what is ceasing when the car cuts out. The simlest start is to read the fault codess. It may lead nowhere. There are many things that self-diagnostics won't cover but real testing is complicated.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

InkyWinky,

Your car seems to be acting as though the rev limiter is at 3,000 RPMs, instead of the regular 6400 (or close to) RPMS, correct?

SteveBFL, what controls the rev's? In other words, what 'chip' or relay controls the rev limiter? I have heard once before that the contacts in there got dirty and it was causing rev limiting at the wrong time.

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

There are many "limp home" substitute values that modern controllers institute to protect them selves. I know of one at 4000rpm and one I think around 1800 rpms. I know of nothing at 3000 rpms.

Most of these strategies are involved with throttle control. The system most responsible is EA/CC/ISC or CC/ISC (electronic accelerator/cruise control/idle speed control).

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Ohhhh, ok, I see now.
That makes perfect sense. Inky, you must take it in to have all of the codes read!!! Good luck and let us know what it was!

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)