Question about 1999 Jeep Grand Cherokee

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Just installed new moter and it wont start how do

Just installed new moter and it wont start how do i test the coil pak

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I'm not sure if you have 1 or more coil packs, but if you get a Chilton manual, it'll tell you how to check primary and secondary circuits on each of the coils. You can also take the coils out and take them to Autozone and they can check them for you. A quick and easy way would be to take the spark plug end of one spark plug wire off, hold the electrode with a pair of WELL INSULATED pliers,( Only touch the insulated handle, not the metal on the pliers) hold it about 1/4 inch from a good metal ground, then have someone try to turn the engine over. If you're getting spark, you'll definitely see the sparking from the electrode to the ground. FYI Only take one plug wire off at a time to prevent mixing them up and make sure you keep your hands and other body parts away from anything that could hurt you. There is also a control module that, if bad, can make it so the car won't start. This can also be checked at Autozone for free.

Posted on Jun 29, 2009

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Hi There,
I just wrote and now that I got your second message this is exactly how the faulty coil pak acts.
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