why would i have oil in only the back 2 spark plug cyclinders

10

Asked by Feb 27, 2017 at 03:10 PM about the 2002 Isuzu Trooper 4 Dr LS SUV

Question type: Maintenance & Repair

I had the valve covers replaced now I am having a rough idle in park it is also shifting rough replaced the egr, the pcv cleaned the valve body and ports decided  to replace the spark plugs that's when I found the oil but only in the back 2 ports

1 Answer

116,685

Oil on spark plugs, also called oil fouling, is commonly caused by failing valve stem guides and bad stem seals. As pressure builds up in the crankcase, excessive oil enters the combustion chamber through worn-out piston rings or cylinder walls and forces its way to spark plugs.

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