Every body has had a least a few CPS issues, I've had a hundred :bawl:
In my previous post I mentioned that the spark drops out, but in particular it was cylinders 2,3 & 4 & 5 that lose it above idle. These cylinders are opposing on the distributor cap, (3 & 4 and also 2 & 5) leading me to the conclusion that two of the three big windows on the flywheel that trigger the CPS weren't triggering, or the CPS couldn't pick them up. I took out the CPS & cleaned the nipple & put it back in. Wow, now I've got 2 & 5 back, & only 3 & 4 are dropping out at rpm's. Since I've spent more $$ on CPS's than tires in the past few years, I just shook my head & went to Napa for a replacement. I installed it, only to have the flywheel beat the nipple to death in a few revolutions of the engine. Wonderful. I pulled it out & compared it to the one I just replaced. The older one (used from a junkyard)had an egg shape to the inner hole to mount it to the bellhousing. This allowed just a slight bit of up & away adjustment. The Napa one didn't. I went to the Jeep dealer & talked to a super cool tech who said that there was a TSB on the CPS's long ago, now canceled, that told the tech to wallow out the hole so that you could place the nipple a little closer to the tone ring when things go pear shaped (british slang for crappy). I never noticed the wallow before, so I reinstalled it & sure enough, if I try to mount it lower toward the flexplate it will beat against it, but seemingly only once per engine revolution. The tech gave me (YES, GAVE ME FOR FREE) a new CPS he had lying around his station. He warned me about my aftermarket flywheel, which does have a bit of a wobble to it as viewed from below. I am afraid to mount my freebie w/o a genuine Jeep flexplate, so I am going to get one this weekend, most likely used, & hopefully not warped or cracked. After all this rambling, can anyone recommend a way to check for out of round on a flexplate, particulary up & down in relation to the CPS, as this would seemingly be the reason for the occasional smack to the CPS nipple?