2013 silverado cyl 7 misfire

Asked by Icaughtawahoo Nov 25, 2020 at 06:19 AM about the 2013 Chevrolet Silverado 1500 LT Crew Cab 4WD

Question type: Maintenance & Repair

I have a 13, silverado 5.3 v8, continues to get cyl 7
misfires, likely caused by an oil fouled plug. I have
about 117k on the motor. I have been replacing the
#7plug when i get misfire codes and that resolves
the minor issue. However also had found a
maintenance note on the manifold, with the pcv
valve causing an issue, that was changed, with no
luck stopping the oil fouled plug in #7. Im not sure
what else i could do,possibly replacing the piston
rings ?

1 Answer
157,535

Bob answered 3 years ago

It could also be a bad valve stem seal which is fairly easily replaced. A compression test, both wet and dry, might be helpful in finding where the oil is coming from.

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