Question about 2000 Ford Mustang

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Miss fire in cylinder 1 and 4

Changed plugs and wires, injectors, has good compression and get fire to the coil.

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  • yankee_redne Apr 24, 2009

    If there was a vacuum leak it wouldnt have good compression, but my compression check was good. any other ideas?

  • justin_mccal May 11, 2010

    are you sure theres good spark from 1 and 4? are they going to the same coilpak?

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Problem could be as simple as a vacuum leak around either of those cylinders. A vacuum leak can create a lean fuel mixure condition resulting in a miss fire. One thing to rememeber is that depending on the style of ignition in use. The opposing cylinder's spark plug and wires act as the return path for the unused voltage from the coils firing which is why you are having seemingly unrelated misfires. If either has a problem then the symptoms are shown in both cylinders.

Posted on Apr 23, 2009

  • Ibhome Apr 25, 2009

    If competely sure that a spark plug was not cracked during installation I would consider coil pack replacement

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Check the spark plug boot and make sure the wires going to your are tight and not damaged

Posted on Apr 27, 2009

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