Engine hesitation - wet spark plug

B

BoomBoy

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#1
I had almost 50,000 miles on the original spark plugs and I was having an engine hesitation under load over 3000 rpm like it was misfiring but no engine code. I decided it was time to replace the spark plugs and I noticed one of the spark plugs (2nd from top in the picture) was wet and darker in appearance (no white). Is there an underlying problem? The misfiring/hesitation problem went away with the new spark plugs.
image_67220481.JPG
 


T

the duke

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#2
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#756
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#2
Might be oil given it looks like carbon. Determine if it’s water intrusion past the coil or bypass from the valve cover gasket.
 


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