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Old 10-11-2012, 09:23 PM
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smj999smj smj999smj is offline
Master Enthusiast
2006 Pathfinder
2003 Frontier King Cab
2003 Frontier KC SVE 4x4
 
Join Date: Jun 2012
Location: Prospect, VA
Posts: 1,866
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Piston and ring failure won't cause oil inside the spark plug tube. This is a fairly common problem due to a bad spark plug tube seal. Remove the valve cover and replace the valve cover gasket and spark plug tube seals. Use brake cleaner, compressed air and a rag to clean the oil out of the tube. Also, clean the oil off of the spark plug wire boot for that cylinder. If the boot is bloated, replace the spark plug wires. Oil in the well can cause the spark to jump from the spark plug wire boot to the metal spark plug tube, causing a misfire and possible P1320 and/or P0300/301/302/303/304 trouble codes. Fel-pro make a valve cover set that has both the gasket and the seals, as well as new rubber grommets for the valve cover bolts.
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