Hasko, I had exactly what you described with my engine, and the Idle Control Valve (ICV) was my main problem with too much fuel (ponding in the intake...wetting the plugs). Simply remove the ICV from the intake (2 bolts, 2-wire plug-in connector, inserted into a vacum tube running from the underside of the air meter to the head) and check to see if it is open slightly, or mostly closed, like my old one is. I changed it out and that's the last of ponding fuel in my intake. Of course you will have to remove the plugs and dry them, and spin the engine a few turns (unplug your fuel relay first) before replacing the plugs, to blow out any remaining fuel before starting again.

I went through the fuel dist. and regulator, pressure testing, etc. before I realized that the engine would run rich if I removed the cold start valve and then tried to crank it. You could remove yours and position it to see if it is leaking, or spraying while plugged in and cranking and/or running. Just keep in mind that it's a machine, and humans designed it, so it's subject to some flaws, for sure.

Good luck and let me know if I can assist further.

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'87 300E | 2.6 engine
Artic White - Navy blue interior, chrome rims, very clean and sharp!
91 300E
89 300E


The rest of my collection are just cars and trucks...no more "automobiles"...