Sep 182015
 

Read obd reader P0300 changed out 6 spark plugs to brand new found one coil that looked corroded, unplugged that coil to see if engine ran worse. No change in sound so I figured this cylinder is definitely the problem, changed that coil cleaned throttle body. Still getting same issue changed fuel filter fuel pressure is good. I feel I’ve isolated the problem to cylinder 4 which had corrosion but now am wondering what it could be

  One Response to “Chevy trailblazer”

  1. Could be a bad fuel injector. Try swapping it with a different cylinder and see if the problem follows the injector.
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    P0300 Chevrolet – Cylinder Misfire Detected Random Cylinders

    Possible causes
    – Faulty spark plug (s)
    – Faulty ignition coil (s)
    – Clogged or faulty fuel injector (s)
    – Intake air leak
    – Fuel injectors harness is open or shorted
    – Fuel Injectors circuit poor electrical connection
    – Ignition coils harness is open or shorted
    – Ignition coils circuit poor electrical connection
    – Insufficient cylinders compression
    – Incorrect fuel pressure

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