Spark plug question...Is this Normal???
09-10-2013, 06:32 AM
#1
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Spark plug question...Is this Normal???
Changed out the plugs on my 07 c280 @ close to 100K miles on service A. There was oil present on the threads of the plugs, all of em....is this normal or is my car running too lean or vice versa.......I have changed many plugs but none have come out like this
, smelled funny too.....attached are some pictures please 
advise......
no codes no check engine light
....mpgs might be in 18/20s range....
javvy
, smelled funny too.....attached are some pictures please advise......no codes no check engine light
....mpgs might be in 18/20s range....javvy
09-10-2013, 08:04 AM
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2003 CL203 C320, 2002 W208 CLK320 cabriolet, 2012 A207 E350 cabriolet, 2011 X204 GLK350 4matic
I've seen cracked head gaskets cause that, also when a car is running lean. To be honest it could be a whole mess of things.
09-10-2013, 09:26 AM
#3
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It seems unlikely that it was caused by a cracked head - especially in the absence of any other symptoms. I would suspect the oil was somebody's idea of anti-seize.
09-10-2013, 09:27 AM
#4
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It's the tips that count. The dirty threads are from anti seize agent or similar or plugs being incorrectly torqued either too loose or too tight allowing very minor leak.
From what I can see of the tips they all look fine. This is not a fuel trim issue at all.
From what I can see of the tips they all look fine. This is not a fuel trim issue at all.
09-10-2013, 12:10 PM
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09-10-2013, 01:59 PM
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thanks a ton guys...you openion counts a great deal to me......
Appreciate your time spend in looking at my thread...
javvy
Appreciate your time spend in looking at my thread...
javvy
