Misfire problem 00 4.0...Plugs? CKP? Or? - Page 2 - Jeep Wrangler Forum
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Old 07-22-2013, 10:28 PM   #31
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Join Date: Jun 2013
Location: Chattanooga TN
Posts: 121
I have run into aftermarket crank sensors giving misfiring issues. If you have your original and not sure anything was wrong with it then reinstall it and test. Remember that the crank sensor is supposed to have a small air gap between it and the flywheel. Too close and you can mess the tip of it up and too far and you will have a reading issue. It should be about the thickness of a matchbook lid (.015) or so away from the flywheel if I remember correct. Some of the ckps come with a small felt piece glued to the tip. If you put one in that has this the go ahead and let it hit the flywheel. This felt/paper sets the gap and gets knocked off when you start it. After that I would check the plugs but if you have done them twice and your last was autolites (I prefer NGK or champion in chryslers) they probably are ok.
You do have what can be a difficult problem to diagnose. Remember just because you replaced something, it's not guaranteed to be good (especially true with aftermarket parts). Now before everyone rants about how good their aftermarket parts are, I use quality aftermarket stuff everyday and most of the time it's ok! I have run into a few vehicles that have fought me on this issue though. Secondly sometimes a (GOOD) technician can save you money in the long run, especially if you are throwing parts at it . Good luck and hope this helps!

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