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Posted on Jun 06, 2010
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Miss fire 1 and 5 changed wires and plugs - 2003 Ford E250

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  • Marvin
    Marvin Jun 06, 2010

    The most common misfire causes on the cars I've worked on have been: Spark plugs Spark plug wires Ignition coil Fuel injector Wiring to fuel injector Timing Belt OR CHAIN Vacuum leak or stuck open EGR Contaminated fuel or bad fuel pump Weak compression due to mechanical engine problems like burned valves or scored cylinders Blown head gasket

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  • Posted on Jun 06, 2010
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Joined: Dec 22, 2009
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Probably coil pack. Follow spark plug wire from spark plug to where it plugs in, that is your coil pack.Some are seperatable. Depending on motor size you may have coil over plug. You said wires not (cop) coil over plug boots.If it is coil over plug it is just a boot you changed in that case the coils plug into boots & on plug & an electrical connector. They are seperate for each cylinder.

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