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2004 Cavalier Ecotec Random Misfire P0300

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  • January 28, 2014 at 11:18 pm #571575
    russruss
    Participant

      2.2L ecotec (Vin F, 200K miles) has been generating P0300 random misfire code when idling. It runs fine at speed. I’ve replaced the following: upstream OS, ignition module, plugs, wires, EVAP purge solenoid and gas cap. The only things left I can think of is coil pack, vacuum leak or weak battery. Am I missing anything? This problem has only been apparent for 2 months.

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    • February 26, 2014 at 1:22 am #577133
      russruss
      Participant

        It’s been cured. Intake manifold gasket failure. Replaced and running beautifully once again.

        February 26, 2014 at 1:42 am #577144
        college mancollege man
        Moderator

          [quote=”graphicfish” post=89540]It’s been cured. Intake manifold gasket failure. Replaced and running beautifully once again.[/quote]

          Glad you worked it out.

          February 26, 2014 at 2:38 am #577186
          Lorrin BarthLorrin Barth
          Participant

            I don’t know the service history of your engine but there is an important piece of advice that was given above – the timing chain. If that has never seen service it should at least be inspected.

            February 27, 2014 at 1:24 am #577329
            EricTheCarGuy 1EricTheCarGuy
            Keymaster

              Nice! Thanks for the update and for using the ETCG forum.

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