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shailey 05-04-2007 11:27 AM

W210 Rough Idle
Hi, Folks,

I have a 2002 E320 with 68,000 miles on the clock. Last year, I began to notice a roughness or miss while idling on rainy days. The shop checked it over and couldn't find a reason for the condition. The problem just went away once the weather cooled off last fall.

Well, now it's back. Does anyone have a suggestion as to how to address this problem? There are no fault codes showing on my meter. Should I be concerned, or should I just consider this to be an idiosyncracy of this particular vehicle?

Thanks for your help.

ILUVMILS 05-04-2007 12:12 PM

I replace lots of ignition wires on M112/113 powered MB's with over 40,000 miles. The good news is that they run like new afterward. The bad news is that the wires aren't cheap.

ProV1 05-04-2007 06:32 PM

my guess is your MAF might be on its way out. try cleaning it or replace it next time u get new air filters

okc329 05-04-2007 07:56 PM

Rainy weather could be
causing an arc from a plug wire to a ground. When air is moist, it becomes more of a conductor. Put car in a dark garage and run engine while idling roughly. Look for arcing off of plug wire.

shailey 05-09-2007 08:28 AM

Hi, Folks,

the rough idle turned out to be a miss on the #6 cylinder. My Indi, World Foreign Car in Richmond VA, replaced both spark plug wires and everything is fine.

Thanks for your help.


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