well, I checked the spark plugs that I replaced about a month ago but there were carbon depostis on all of them (some more some less). So after some cleaning of the plugs the engine is roaring again.
This probably points out that the fuel/air mixtyre is rich (right??) which can be caused from a bad oxygen sensor (right??).
Replacing the O-sensor should be a piece of cake as I recall from readings.
Is it anything else though?
How do I test the fuel mixture of the car?
and also how do I read the codes from this car (an 1988 300E)??
thanks for your input