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1999 Ford Expedition Question: What can I do to fix a misfire

 

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, 5.4L V8, El Paso, TX, April 06, 2013, 17:26
 Rookie

Vehicle didn't have a misfire just a bad coil in #8, so I decided to replace all Spark Plugs and Coils, Trottle position sensor,EGR pressure Feedback sensor,EGR valve,Idle Control valve after all this was done I got codes P0353 and P0356, checked connecters and rechecked spark plugs and also changed out coils 3-6 but Notting what can I Do now

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  • Answer #1

    April 06, 2013, 20:44
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     Master

    MOTORCRAFT PARTS???? Hard to beat FoMoCo parts on a Ford vehicle, especially electronics!

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    , April 06, 2013, 22:25
     Rookie

    Yes all......parts

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    , April 06, 2013, 22:59
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     Master

    So much for that! Possible ecm but not likely. There has got be a circuit problem to 3 & 6. Check connectors with dvom and compare to working cylinder. Are those two cyls. misfiring so as you can tell it with engine idling?
    Maybe take it to a mechanic!

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