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Code P0308 cylinder misfire?

Tiny
JWESLEYGARNER
  • MEMBER
  • 2009 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 193,000 MILES
Rough idle and no power when driving check engine light on code of p0308, ABS light on steady and service stablitrak message. Replaced manifold gasket, spark plug, coil and spark plug wire, fuel injector still nothing. Even read that the brake light switch could cause it, changed that and nothing. Ready to burn it.
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Thursday, August 18th, 2022 AT 9:45 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
The Code P0308 cylinder misfire problem we will look at on this thread you will need to make a new question for the other issues. The brake light switch will not cause the problem, so you are safe there. We need to do a compression test of cylinder #8, remove the fuel pump relay so the engine doesn't start and remove the spark plug, then roll in a compression test gauge which you can rent from the auto parts store for cheap. This guide can help us do the test:

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run down this guide and report back. Please upload a picture of what #8 spark plug looks like so I can see it.
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Thursday, August 18th, 2022 AT 1:22 PM

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