Question about 1991 Ford F250

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My Ford F250 has an intermittent miss. I have replaced the spark plugs ,wires, cap and rotor. When I replaced the Spark plugs the miss went away for 1 day. The next day the miss came back when I started the engine in the morning .I then replaced all the other components and the miss did not go away. I am at a loss at this time.

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  • Ford Master
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You can find the miss by starting the engine and pulling one plug at a time. when you find the one that doesn't change how the engine runs, there is your problem area. things to do are, first I would switch the wire and see if the miss goes away. If it doesn't then pull the plug and see if it is fouled out. do a compression test on that cylinder. if the compressionis low you can spray some wd40 in the cylinder and retest. if the pressure comes up then the rings are bad, if it doesn't then you have a valve problem.let me know

Posted on Nov 15, 2010

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