Question about 2001 Jeep Grand Cherokee

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I remove old spark plugs from my Mom car. And put in new autolite spark plugs AP985, and set gaps to.035. And the car is running rough.

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Two possibilities to start with;
A bad plug (it happens now and then) or manufacturer defect, which you can trace with one of the old plugs by swapping one-by-one...or
A damaged plug wire...This is easy to do when pulling the boots from the old plugs.
If one or more of the boots was harder to remove than the rest, then start with those lines...the small clip inside the boot can be pulled loose and this poor connection causes a gap that will show up as a miss in the engine.
With the engine off, press each wire (not too hard, but firmly) into the boot and try to start it.
If it's still rough, then use a continuity tester on each line to find the open line.
* Remove & Test each line one at a time so you can replace each where it belongs.

Another less-possible problem: One of the plug wires went to the wrong plug...If you replaced one plug at a time then this isn't possible, but it's a common novice mistake.and easy to fix.
There should be a "Firing Order" sticker near the radiator, and again in the owner's manual, showing the wiring diagram for the distributor wires.

***Don't forget to VOTE for the guys who take an interest in helping!

Posted on Jun 04, 2010


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