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Old 02-25-2012, 11:54 PM   #1
Join Date: Dec 2011
Posts: 61
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.

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Old 02-26-2012, 12:28 AM   #2
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Was the oil only on the threads and not on the firing gap? How many miles are on the motor?

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Old 02-26-2012, 10:02 AM   #3
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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.
my 06 LJ rubicon
2.5" SL, 1" BL, DIY highline, 35s with double beadlocks.
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Old 02-26-2012, 12:30 PM   #4
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The oil was just on the threads and it has a little over 86k on the engine
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Old 02-26-2012, 02:41 PM   #5
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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.
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

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Old 02-26-2012, 06:38 PM   #6
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so i changed out the valve cover gasket today so we will see if it stops.
thanks guys
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Old 02-26-2012, 06:44 PM   #7
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was about to say valve cover gasket haha happened to my buddys truck last week, gasket solved the prob ;]

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