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Check Engine Light Flashing? Misfire Diagnosis by Autolite Spark Plugs

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Uploaded by on May 18, 2011

How to diagnose engine ignition misfires. Step by step instructions on how to figure why your engine is misfiring and how to fix it.

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  • my check engen light was flashing because i pulled a plug wire i hooked it back up the light went off and i am happy

  • Great information, and professionally done. Thanks.

  • this was actually very helpful

  • Air leaks can cause a missfire too,Early GM 5.3s are this way.A blown out intake gasket will cause a missfire on a GM 5.3.Wrong brand spark plugs used too and I see this a lot with Bosch plugs.

  • Thanks for the very informative video, but a question on the detection the o2 sensor makes,does it detect the excess amount of fuel or just the amount or lack of oxygen in the mixture? i am not sure if you guys left the note below or someone else did, just want to clarify thanks..

  • NOTE: at 01:06 The O2 sensor or oxygen sensor does NOT detect excess amount of unburned FUEL. The O2 sensor detects the amount of OXYGEN.

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