Question about 1998 Ford F150 Regular Cab

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Pickup misfires on more thanone cyl. all speed ranges

Changed coil pak plugs an wires

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  • popabear5366 May 09, 2009

    i thank every one for their help it was very helpful but yes it had two coilpacs the computer said misfire on 2 ,6 an 8 i thank every one again i traded it for a new chevy silverado no more miss thank you god bless popabear5366

  • juggernautxt
    juggernautxt May 11, 2010

    any codes?

  • Craig Spell
    Craig Spell May 11, 2010

    is this the model with two coil packs?
    4cyl?
    how do you know it is a misfire?

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  • Ford Master
  • 1,348 Answers

Enjoy the new truck.

Posted on May 14, 2009

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1 Answer

02 Toyota Tacoma when engine warms up cylinder 3 has a misfire po303


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Random misfires usually happen when the spark jumps from one wire to another out of sequence. The cause can be bad wires or you can have a cracked coil-pak. The coil-pak can be bench checked at some autoparts stores. Another possible problem is the Crankshaft sensor which lets the engine know the position of the crankshaft before firing the sparkplug.

Sometimes you can observe the wires arcing when the engine is running in the dark. You may also be able to mist the engine with water using an old spray bottle. The wires should be well enough insulated to withstand the extra water and if the wires don't they need to be replaced.
The Code for a Random misfire may eventually set to the problem sparkplug wire or plug. Even knowing which side of the engine is causing the misfire can help to narrow down an individual coil-pak or wire.

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Have a 2000 buick park ave. after changing plugs and wires check engine light still on. computer code says misfiring number 5. What part needs changing? Im thinking the coil?


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I changed out the spark plugs and wires and now the check engine light comes on and its misfiring


Wrong firing order? Incorrect gap on new plugs? Didnt replace coil pak/paks?
All are easy solutions that can affect your engine the same way.

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