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bobb2u
bobb2u 2/15/2013
1997 Chrysler Concorde LX 6Cyl3.5L - Engine
on my chk engine light, code read muli-engine misfire
had spark plugs replaced,spark plug wires were also replaced, still chk engine light came on, finally it was the lower intake manifold gaskets that was bad, to this date no chk light on
1 Answer
  • Jimm
    Jimm 2/16/2013
    P0300 Random/Multiple Cylinder Misfire Detected

    A code P0300 may mean that one or more of the following has happened:

    Faulty spark plugs or wires
    Faulty coil (pack)
    Faulty oxygen sensor(s)
    Faulty intake manifold gasket(s)
    Faulty fuel injector(s)
    Burned exhaust valve
    Faulty catalytic converter(s)
    Stuck/blocked EGR valve / passages
    Faulty camshaft position sensor
    Defective computer

    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.

    Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold (intake manifold gaskets) or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
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