hello all, I have a 1999 TJ manual 4.0 that is running well except the idle is now about 1050 rpm. I cleaned the IAC Idle Air Control Valve and it dropped it to this level from about 1300 and a pulsing idle with the AC on; which is gone now so cleaning helped a lot.
I decided to replace the IAC with one from Pep boys and after replacing the idle went to 2500-3000 rpm even after driving it for 20 min and even resetting the jeep computer. I bought a Mopar factory IAC today and it had the same results. I put my old one back in and it goes back to the 1000 rpm and runs good. I've checked for vacuum leaks the best I can. It doesn't seem to be calibrating the new IAC valves to the original settings so it just runs high based on the old IAC settings.
Does anyone know a good shop that knows Jeeps that I could take it to without getting raped? I just don't have the electronics to diagnose the issues further. The codes I have point to the IAC specifically P0443 and p0505.
Any help would be greatly appreciated.
I decided to replace the IAC with one from Pep boys and after replacing the idle went to 2500-3000 rpm even after driving it for 20 min and even resetting the jeep computer. I bought a Mopar factory IAC today and it had the same results. I put my old one back in and it goes back to the 1000 rpm and runs good. I've checked for vacuum leaks the best I can. It doesn't seem to be calibrating the new IAC valves to the original settings so it just runs high based on the old IAC settings.
Does anyone know a good shop that knows Jeeps that I could take it to without getting raped? I just don't have the electronics to diagnose the issues further. The codes I have point to the IAC specifically P0443 and p0505.
Any help would be greatly appreciated.
