I have a 1987 300E, and having starting problems, and i replaced many parts also, but it did not help.
I have seen many of you writing about fuel relays,ovp,etc., which is connected with bad fuel distribution.
In mine case it.s a rich fuel delivery, it's sending to much fuel!
Engine is full of fuel, fuel pump is working but having high pressure.
I replaced fuel regulator, and fuel distributor, but did not helped.
Is it steel in connection with f.relay and ovp?
What about fuel sender?
I checked every topic on this forum, but none is related to my problem.
Thank you in advance!

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.

__________________
'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"...

Thanks a lot, but i left my benz at the dealership,to get the diagnostic.
I will keep that in mind, what you told me, about the idle control valve.
Where is it located:inside the trotle body,next to it ,next to the regulator...?
I can chainge it my self, if i know where is it located, you know what i mean, but how come is a idle valve connected with the fuel distribution?Stupid question i know, but i am not a proffesional, you know.
Thank you for the info.!

The idle control valve is bolted to the intake, with two bolts and a two wire connector, and you should be able to find it, as it's in front of the fuel dist. (if you are looking at the engine from the front of the car).

My engine was flooding more than you could imagine, but don't take my word for it...as your dealership will give you some kind of answer soon.

Good luck.

__________________
'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"...

Thanks a lot,will see what is going to be!