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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 86charcoalsierra on June 15, 2010, 04:15:58 pm

Title: Oil in spark plugs
Post by: 86charcoalsierra on June 15, 2010, 04:15:58 pm

I changed the spark plugs on my 86 gmc sierra 305 about 3 months ago and about 2 weeks ago it started to misfire i pulled the spark plugs to check them and about 4 of them were full of oil so i changed them wiped out the little oil that was in the spark plug hole and it ran fine. what would cause the oil the get inside the spark plug hole.

Title: Re: Oil in spark plugs
Post by: beastie_3 on June 15, 2010, 06:39:28 pm

Bad rings

Title: Re: Oil in spark plugs
Post by: VileZambonie on June 15, 2010, 07:17:17 pm

Or valve guides or valve seals... If it's really bad just screw in some spark plug non foulers in the mean time