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Brianmlove 02-25-2012 11:54 PM

oil on spark plug
I have an 05 TJ X w/ 4.0 6 cyl auto and 2" suspension lift on 32x11.5x15's. I had a misfire code pop so I was checking to make sure that each spark plug was properly gapped and the last one i took out had oil on the threads. I was talking to my buddy and he said it was looking towards and engine rebuild, but I was going to get your guys opinion.

wolfpack72 02-26-2012 12:28 AM

Was the oil only on the threads and not on the firing gap? How many miles are on the motor?

jgorm 02-26-2012 10:02 AM

If its just the threads if may have leaked out of the valve cover into the plug hole. If the electrode has oil on it, the rings or valve seals are bad.

Brianmlove 02-26-2012 12:30 PM

The oil was just on the threads and it has a little over 86k on the engine

doclouie 02-26-2012 02:41 PM

If it was just on the threads it probably leaked from the valve cover and isn't a concern. Valve cover gasket is an easy fix.

Brianmlove 02-26-2012 06:38 PM

so i changed out the valve cover gasket today so we will see if it stops.
thanks guys

Wrangler06 02-26-2012 06:44 PM

was about to say valve cover gasket haha happened to my buddys truck last week, gasket solved the prob ;]

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