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Old 05-04-2007, 11:27 AM
Registered User
Join Date: Apr 2006
Location: Richmond, VA
Posts: 36
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.

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Old 05-04-2007, 12:12 PM
Senior Member
Join Date: Sep 2002
Posts: 3,046
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.
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Old 05-04-2007, 06:32 PM
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Registered User
Join Date: Oct 2006
Location: Ann Arbor, MI
Posts: 256
my guess is your MAF might be on its way out. try cleaning it or replace it next time u get new air filters
Current cars:
2001 MB E55 AMG
2003 Honda S2000
2000 Honda CRV

Gone but not forgotten:
2004 BMW 325i 5sp sport
1999 BMW 540i sport
1997 MB E420
1995 BMW M3 coupe
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Old 05-04-2007, 07:56 PM
Registered User
Join Date: Feb 2002
Location: St. Louis, MO
Posts: 340
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.
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Old 05-09-2007, 08:28 AM
Registered User
Join Date: Apr 2006
Location: Richmond, VA
Posts: 36

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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