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    sylviah's Avatar
    sylviah Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 21, 2014, 07:16 AM
    When the engine light is reading a miss fire, what can it be?
    I have a 2005 Kia Sedona Van it is miss firing at #2 cylinder. Had the ignition. coil for that unit replaced, did a tune up twice,, and checked the engine for loss of pressure it was good. What is left to do?
    smoothy's Avatar
    smoothy Posts: 25,490, Reputation: 2853
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    #2

    Mar 21, 2014, 07:42 AM
    What does the computer codes say is wrong? You should always check the codes before you start buying parts you might not need.
    odinn7's Avatar
    odinn7 Posts: 7,691, Reputation: 1547
    Entomology Expert
    		  
    #3

    Mar 21, 2014, 07:50 AM
    If you've done a coil and plugs then it could be a bad head gasket, a bad intake gasket, a bad injector.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #4

    Mar 21, 2014, 10:12 AM
    Check for codes. Problem may be a vacuum leak. Attach a scan tool and check the short-term and long-term fuel trims. If both are decidedly negative, the problem may be with the ignition system (e.g. plug wire or PCM spark driver); if both are significantly positive (greater than 5%), look for a leak. Check the fuel injector and its wiring, plug gap, and coat the top of the electrode and porcelain portion of the plug with dielectric grease. If the problem persists, the oxygen sensor may be a factor. Only use the exact same plugs that originally came in the vehicle.
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