Question about 2002 Jeep Grand Cherokee

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Miss fire on cylinders 1,3,5,7 - 2002 Jeep Grand Cherokee

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Misfires are usually due to faulty plugs, faulty spark, or faulty fuel injection. Assuming that you installed new plugs and the new plugs were gapped correctly, plugs can be eliminated. Maybe the coil rail is not installed properly. I suggest that you take it off and then reinstall it to make sure the connections have been made securely. Disconnect the battery to erase the codes and then see if that helped.
If it didn't, then some of the injectors are suspect. You codes say misfires occur in cylinders 2, 3, and 4. The usual low tech way to check injectors is to interchange a good injector and a possible bad one and see if the code moves to the cylinder with the suspect injector. Interchange injector #1 (probably a good one) with injector #2 (probably a bad one). Erase the codes and drive to see if P0301 replaces code P0302. You'll know what to do if it happens.

Posted on Sep 14, 2010

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Posted on Jan 02, 2017

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