1992 400 E help - PeachParts Mercedes-Benz Forum

michaelct · #1 08-25-2006, 07:10 PM

hi i like to know if any one knows why my 400 E starts and runs fine,
but when you drive it the eng goes up and down like its losing fuel.
i took it to a shop and the shop owner told me it was the fuel filter.
he replaced the filter but it is still doing it.
i was told that it was the eng wire harriness, i replaced it (need to any ways)
but the same thing. now im told its the mass air flow.
can some one help me!!!! lol

suginami · #2 08-25-2006, 08:53 PM

Could be the mass air flow meters, vacum leak, or a throttle actuator.

Try a search on the above items. There's tons in the archives.

deanyel · #3 08-25-2006, 10:50 PM

What are the fault codes saying? Have them read if you haven't already.

hackbite7 · #4 08-29-2006, 03:21 AM

I'd look for a vacuum leak;also I'd clean my carb.I did my harness and all that on my 400. She still acts up sometimes, simple little things seem to help.Is the ASR system being engaged ?

david s poole · #5 08-29-2006, 10:36 AM

possible mass air flow but doubtful.more likely to be something to do with electronic accelerator.were the adaptions reset after the engine wiring harness replacement done?

Mike Freeman · #6 08-29-2006, 12:18 PM

The throttle actuator is a good place to start but don't overlook the fuel pump package, This car has two pumps and when one is going bad the car will run unpredictably.
Mike