Hi all
Thanks to anyone reading and sending comments !
I have a 1999 CLK200 (no kompressor), 276000 km, with a misfire problem going on for months now. I have searched this forum and found a user (http://www.peachparts.com/shopforum/showthread.php?threadid=78878) with exactly the same problem on the same engine. His problem seems to be solved but mine still isn't.
Every time the car runs fine it only takes a day or 2-3 before it starts misfiring again, pulling away and while rpm is less than 2000 the engine misfires with explosions in the exhaust system. At acceleration after every deceleration, with rpm < 2000 it misfires, the lesser throttle the more problems. Above 2000 rpm and highway it runs fine.
First spark plugs have been replaced, afterwards, spark cables, afterwards one coil and new spark plugs, afterwards new coil moved to other old coil, nothing helps.
From the Trond post I learned spark plug can get waste very quickly, in a couple of days, but I don't understand by what.
Another thing I learned is that bad radio reception is connected to electrical issues of a car as well, I believe my reception isn't as good as it used to be but I don't know if there's a connection to the problems I have. The last thing I tried was to follow advice from this site : Bosch F8 DC4 gapped at 1 mm. It ran fine for 2 days (500 km).
Diag. shows only misfire fault code.
If anyone could help in answering these questions :
- What can I do next ?
- Can I measure some electrical value some place, eg resistance, voltage ... that would lead to a solution ??
- Does the decreased radio reception ring a bell ??

Thanks to you all in advance.
Kindest Regards,

Nico