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Not running properly and oil found on one of the spark plugs, what would cause this?

Tiny
TROGLINJ91
  • MEMBER
  • 2010 CHEVROLET MALIBU
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 166,000 MILES
I changed my plugs and found oil on one of them, why is this? Also, my car while driving will stay revved for a second or two after letting off accelerator, why is this?
Thursday, August 17th, 2023 AT 2:34 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

If the oil on the spark plug was on the porcelain portion (inside the spark plug tube where the coil attaches), the valve cover gasket is leaking. Each one of the spark plug tubes has a gasket to prevent oil from getting in there. It sounds like one has failed.

If you look at pic 1, it shows the top of the cylinder head with the valve cover removed. I highlighted where the gasket goes. Note that it goes around 4 circles. That is where the spark plugs go down into the head. That needs to be sealed or oil gets into the spark plug tube.

Starting with pic 2, I included the directions for removing and reinstalling the valve cover.

Let me know if this helps.

Take care,

Joe

See pics below.
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Thursday, August 17th, 2023 AT 9:01 PM

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