Edmunds Answers

Voted Best Answer

  • avatar patrick88 07/12/08 7:50 pm PST

    What vehicle?
    PO300 and PO301 Is random misfiring and misfiring in cylinder#1.
    Could be various things to check (you already did the plugs, wires, TPS, injector did you check the electrical connection on the injector too?, etc..)
    I'd check:
    timing again;
    egr valve and transducer
    IAT
    Fuel pressure
    all vacuum hoses and connections
    compression check too
    pcv valve (doubt it but...)

    Just repaired my dad's Prizm with the same codes plus P0304. His was because he washed the engine and water got into the wire connections (gave it new plugs and wires, needed them anyway, and cleared all codes)

Answers

  • patrick88 07/12/08 7:50 pm PST

    What vehicle?
    PO300 and PO301 Is random misfiring and misfiring in cylinder#1.
    Could be various things to check (you already did the plugs, wires, TPS, injector did you check the electrical connection on the injector too?, etc..)
    I'd check:
    timing again;
    egr valve and transducer
    IAT
    Fuel pressure
    all vacuum hoses and connections
    compression check too
    pcv valve (doubt it but...)

    Just repaired my dad's Prizm with the same codes plus P0304. His was because he washed the engine and water got into the wire connections (gave it new plugs and wires, needed them anyway, and cleared all codes)

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