Quote:
Originally Posted by 777funk
Thanks for the reply. The Check Engine light isn't on. I'm assuming that means no codes or that the bulb is burned out. I'll have to turn the key and see if it lights up.
So fuel into the vacuum line... what indicates this is a possibility?
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Might mean the CEL iis burned out, does it come on with the key on before starting?
Fuel in the vacuum line will go directly to the intake, very rich at idle.
The coil pack and plug connectors are certainly another big possibility, and very common. Original blue-stickered Bosch coil packs were especially problematic from what I've read.
Next possibility is the engine wire harness, check it over, do a search here for wire harness issues on the M104 (as well as other early '90s Mercedes).
Compression is unlikely a problem IMO, a highly unusual failure in the M103/M104 engines.