Question about 1998 Ford F150 Regular Cab

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Engine code p0307 cylinder #7 misfire

1997 ford f 150 extended cab, v8
changed plugs, wires, coil pack, and fuel injector
check engine light still on
Cylinder 7 is still misfiring

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  • Towny97 Feb 05, 2009

    I have the same problem with my 97 Town Car. Changed all the same parts but still misses. The number 4 cylinder.

  • Anonymous Mar 30, 2014

    Check system light, bucking.

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Has it Ben over heated at all I? If so I would check the oil for water look for white smoke steam coming from exhaust pipes compression test may not be a bad idea as well

Posted on Dec 04, 2014

  • Royal Upton
    Royal Upton Dec 04, 2014

    Has it Ben over heated at all I? If so I would check the oil for water look for white smoke steam coming from exhaust pipes compression test may not be a bad idea as well

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  • Ford Master
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It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

Posted on Feb 05, 2009

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Faulty spark plug or wire
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