Q: Cylinder 6 misfire

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Have a P0306 code, replaced plugs, wires, coil, no leakage of oil, still missing but usually only when it's raining or snowing. I let it sit over night and in the morning it runs good. Have checked valves and replaced rings.

My car has 17900 miles.

Hey there. If after replacing all those items, the cylinder #6 misfire code remains, then there are a few other possibilities. This could possibly be a fuel injector fault. The injector can be clogged or simply worn from age and mileage causing it to not fire properly. Another possibility is a wiring issue. There may be a short / intermittent short in the engine wiring harness to cylinder #6, possible to the coil and/or injector. Lastly, this may be due to low compression. If all other options have been eliminated, a compression test should be performed. If you need help having getting a precise diagnosis, a certified technician from YourMechanic can come to your car’s location to inspect the misfire and pinpoint the needed repair.

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