Hey everyone, I'm chasing a slightly high idle on my 99 4.0 TJ with the 32rh.
The engine idles right about 1000 rpm when in park, and when I tried to take my jeep in for smog today the tech wouldn't even test the Jeep, he could hear the high idle and told me that alone would cause it to fail, so he sent me on my way.
Things I've already tried:
One question I have though is whether I should be able to adjust the length of the IAC tip in and out because I can't seem to adjust mine at all. I've seen videos where you could pull back the collar and rotate the tip in and out to shorten or lengthen it. When I try this on mine I can't get it to spin at all? I read that the tip should be out about 1⅛" and mine is about ¾" so I tried to adjust it and ran into this problem.
Does this seem faulty that I can't get it to adjust at all?
The engine idles right about 1000 rpm when in park, and when I tried to take my jeep in for smog today the tech wouldn't even test the Jeep, he could hear the high idle and told me that alone would cause it to fail, so he sent me on my way.
Things I've already tried:
- Clean throttle body (both while running by spraying carb cleaner into it and also pulled off the Jeep and cleaned on the bench)
- Checked for vacuum leaks -i did a diy smoke test through a port on the intake manifold and could not find a leak anywhere. I've also tried spraying the vac lines with throttle body cleaner with no luck either.
- Throttle position sensor was replaced with a new Mopar about a year ago
One question I have though is whether I should be able to adjust the length of the IAC tip in and out because I can't seem to adjust mine at all. I've seen videos where you could pull back the collar and rotate the tip in and out to shorten or lengthen it. When I try this on mine I can't get it to spin at all? I read that the tip should be out about 1⅛" and mine is about ¾" so I tried to adjust it and ran into this problem.
Does this seem faulty that I can't get it to adjust at all?