Question about 2000 Jeep Wrangler

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Cylinder miss fire. I have changed the plugs and whole coil pack bar. Can't figure out what is wrong.

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A miss fire can be caused by a bad fuel injector or wiring to the fuel injector. Do a self test on the computer. turn key off-on, off-on, off-on. The codes with flash out in pairs on the check engine light, 5-5 being the end of the test. It may identify the problem cylinder. IF you do find a stuck injector you can try the redneck fix. Put a long socket extension on the injector and tap lightly with a hammer while the engine is running. TAP LIGHTLY!!! ITS ONLY PLASTIC!!!!! This may free up the injector. make sure spark is reaching the plug.

Posted on Nov 10, 2010

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  • Master
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I would double check to make sure you didn't get a couple of plug wires mixed up somewhere. If not narrow it down to what cylinder is miss firing and check the compression and the injector on that cyl. If the jeep seems to be idling higher than normal I would be checking the intake gaskets. If it idles low or normal the intake gasket are probably not the problem and it is the injector or a bad compression problem.

Posted on Nov 10, 2010

  • gscott1138 Jul 27, 2011

    2000 thru 2006 4.0 aint got no plug wires dummy

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