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(1999 Chevrolet S10)
in Hillsdale, MI on May 05, 2011
1999 Chevrolet S-10, 4-cylinder 2.2-liter, rear wheel drive, manual transmission.

Pick-up running rough, loss of power, service engine light comes on, I drive to a well known national service center to get code read, they say code is P0300B which means misfire on cylinders #1 & #4, they bring out the coil packs they both have cracks, I tell them to replace both of them. I pay and leave for 32 mile drive home, life is great everything seems fine.

Wake up the next morning it’s doing the same thing. Drive 32 miles back to national service center, same code P0300B, the say they think it maybe a weak valve spring, burnt valve, or a bad exhaust valve, they say they can’t do that work their, tell me not to drive when service engine light is on, they say unburnt fuel drive can damage catalytic converter home 32 miles park pick-up.
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Popular Answer
on May 06, 2011
Sounds like they or another more local shop need to dig deeper in the misfire code diagnostics. For each code there is a step by step diag procedure. The misfire can be caused by anything related to those cylinders. The code is for random misfire on any cylinder. Not just for #1 and #4. Coils, spark plug boots, spark plugs, etc. need checked.
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Valve Job on this approx. 900-1300. Need to perform a compression test first.

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on May 06, 2011
check engine ground, intake manifold vacuum leak
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