Question about GMC Sonoma

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My2.2 5 speed randomly losespower when i step on the gas

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  • Dan Brown Jan 05, 2011

    i have a misfire on # 4 cylinder that shows in the history is there a way to fix this issue



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You will need to check your fuel presure it can not have no less then 58psi at any time, specialy at wide open throttle even though you have installed a new one.

Keep us updated.

Posted on Jan 01, 2011

  • ZJ Limited
    ZJ Limited Jan 05, 2011

    A miss #4 (P0304) may mean that one or more of the following has happened:

    • Faulty spark plug or wire

    • Faulty coil (pack)

    • Faulty oxygen sensor(s)

    • Faulty fuel injector

    • Burned exhaust valve

    • Faulty catalytic converter(s)

    • Running out of fuel

    • Poor compression

    • Defective computer

    The possible solutions, if there are no symptoms, the simplest thing to do is to reset the code and
    see if it comes back.

    If there are symptoms such as the engine is stumbling or hesitating, check
    all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending
    on how long the ignition components have been in the car, it may be a good
    idea to replace them as part of your regular maintenance schedule. I would
    suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable).
    Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic
    converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter
    needs to be replaced. I've also heard in other cases the problems were faulty
    fuel injectors.

    Keep us updated.



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