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Misfires

Discussion in 'Performance & Tuning' started by Triumphd17, Apr 26, 2021.

  1. Apr 26, 2021 at 5:23 PM
    #1
    Triumphd17

    #1
    Triumphd17 [OP] New Member

    Joined:
    Apr 26, 2021
    Member:
    #5572
    Messages:
    1
    Gender:
    Male
    Vehicle:
    2013 Jeep Wrangler Rubicon
    I am a new Jeep owner and have been restoring a jeep that has been poorly taken care of.

    It is a 2013 Wrangler Unlimited Rubicon with 216,000 mi on. It and it has a misfire that pops up on cylinders one and two (code PO300). These are on opposite sides of the engine in the front(right and left banks). When it is misfiring the injectors Are lean on one and two and rich on three and four.

    The odd thing is that if I reset the ECU all of the misfires disappear and the injectors all are injecting about the same amount. Once I shut it off and start it up again the misfires come back.

    I have replaced the coil packs the spark plugs the oxygen sensors and the PCV valve and tested for vacuum leaks using a propane tank with a hose.

    I am at a loss as what to do next. In addition, it is now starting to get a code for my catalytic converters efficiencies on both sides. (PO430 and PO420)
     
    Last edited: Apr 26, 2021
    Triumphd17, Apr 26, 2021
    #1
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