the Jeep is pissing me off lately. Been fighting a hard start, rough idle when it’s cold. All my troubleshooting lead to the IAC. I pulled it out to clean it and check the function. I have a two way scanner, so I can run a couple extra tests. As soon as I actuated the IAC, the plunger shot across the garage! Apparently, the plunger has become unthreaded and was hanging out too far. I threaded out in all the way, and the Jeep started and idled great! Then it developed a chirp, like immediately. That turned out to be the cam synchronizer. Replaced that and the chirp went away, it was running great again. I fired up the scanner to set my sync timing to zero. The Jeep cooled down to ambient again, and now it won’t start.
I guess I’ll dial the adjustment back out. The synchronizer was a
Dorman too. I’m going to try the original sensor and see if that makes a difference.
I’m about ready to go buy a old trailblazer with a good engine…