M111 2.2 misfire thread :-/
 

Hi everyone.

I have a 1994 W124 2.2 M111 and iv recently fitted a new loom, the car hasn't been ran in about 6 months so came to fire it up and its started but running very lumpy.

Whilst the car was in storage, it had been parked in a terrible place which has leaked water into the top of port 3 & 4 i removed the HT leads cleaned and dried them and replaced the plugs.

However still lumpy, i suspect there may be moisture trapped in the HT leads and have ordered some new ones to replace.

Im a bit out of touch with the old mercedes, so could damp in the HT leads cause the misfire? Im starting with this before going down the coil route etc, i know the loom is good as its brand new along with the coil lead

I am familiar with the 1998 M111. Great engine. The 1998 has a gasketed cover on the top. Does yours not have that, or it was off? I will assume yours is the same as mine was. So you have the two coils, the two wires and the two "dog bone" connectors under the coils? Is that correct? Do you have any diagnostic capabilities on that one since it is OBD 1 I think.