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#1
12-19-2004, 03:51 PM
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'98 C280 Rough Idle
My c280 is experiencing a real rough idle. It started out only running rough at idle in drive, but now it runs rough at idle in neutral too. I have replaced the MAS but it didn't help. The car runs great any other time. Anyone else had this issue?
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#2
12-19-2004, 03:56 PM
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I'd change the spark plugs and the coil supressor boots.
Use only the OEM Bosch non-resistor type spark plug. 98% of all rough idle problems on M104 engines are caused by these coil supressor boots.
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Paul S. 2001 E430, Bourdeaux Red, Oyster interior. 79,200 miles. 1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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#3
12-19-2004, 05:37 PM
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It's a 98, so it's a M112, not 104.
Is the check engine light on? Gilly
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#5
12-19-2004, 07:03 PM
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How many miles is this unit sportin', and what kind of maintenance has been done on it? Spark plugs, air filter, fuel filter, any of that been done lately? Are you running premium in it?
Gilly PS Did you replace the MAF sensor yourself, and if a shop did it, did they say anything about "resetting" the "adaptation"?
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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#8
12-20-2004, 06:58 PM
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Try the plugs. The engine control module could have also lost it's ring gear self-adaptation, it would need to be checked using the shop computer SDS.
Gilly
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
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