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I own a 87 E300, which I love. The only real problem I have with the car is that it rumbles violently when it idles for a period of time. If it has been idling like this for a while the acceleration sometimes is very bogged down. I am not sure what to try to fix this. I also noticed that the spark
plugs in cylinders 1,2, and 4 are covered in gunk. I believe this is due to oil burning in the combustion chamber due to warpage in the cylinder walls. Let me know if I am wrong, and what I should due to fix these problems.
 

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The 300e's tend to have problems with the Valve seals in the head. This could be causing a rough idle, and would certainly foul the plugs. It seems the bottom end of these motors are very tough, and is most likely not the source of you problem.

Ken
 

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If your engine has 100.000 plus miles on it, change the valve seat seals. It can be done without pulling the head and will cure your fouling problem, unless of course there is some other problem with your engine.

Good luck.

Alex
 
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