I would still pull your batt. cable connections, clean them for good measure, and replace. Many times it's the simplest things that cause problems (ask me how I know!!). Your battery can measure 12v and if the battery cable connections are poor, you can have similar problems.
The Ignition modules on the 4.2L rigs are notorious for crapping out (I'm on my 3rd one). My personal experience with ICM problems has just been loss of fire to the coil (engine will turn over but never start and won't receive juice to the coil). Still could be a possibility, as I believe the ICM on your 4cyl is different than mine.
In your last sentence, you say "It would not start intermittently"...does this mean it always started right up, or did you mean to say "It would start intermittently"?
Did you have the original starter bench tested? I'd still check for proper power to the starter before moving on.
Ahhh...hmmm. I think you're doing the right thing by taking both parts to have them tested, then. I know on one occassion my ICM would give me intermittent problems (literally would kill my engine while riding down the road, then would take a few minutes to crank back up) before finally giving up the ghost.
I hope I don't sound like I'm questioning your intelligence, but I really would pull the battery cables off, clean and reinstall. It can't hurt. Keep us posted.
Ok, so I jumped both starters I have and nothing. I bypassed the solenoid (spelling?) and both engaged and spun. So i have to go buy a new solenoid and will sell the other starter with the stipulation that it needs a solenoid, unlike they guy who sold me his.
I had the ICM tested and it was bad. Spent $110 for a new one and still nothing? I'm thinking it might be the coil but am having a hard time finding a place to bench test it. Any ideas?
I have a 91 4.0 that uses the crank position sensor (on the bellhousing), and the cam position sensor(on the distributor) to activate the ICM. Had an issue with a bad connection to the CPS that resulted in the same condition. Any idea if your motor has both of these sensors? I have no experience with 4.2's to know, but maybe worth a check?
Originally Posted by 2003Rubi
Make sure you get a sticker that says "Jeep" in Japanese lettering, that mod is good for about 20-25 hp right there.
My Jeep has only ever killed three things. A deer, a dog, and my wallet.
*retired* Low Output Jeep Club # 135