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Tech & Fab
Jeep 4.0 high idle when warm... driving me crazy
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<blockquote data-quote="NotMatt" data-source="post: 1471533" data-attributes="member: 15947"><p>I've got another throttle body kicking around somewhere that came off a good running rig, so I'll start with swapping that IAC tomorrow. I did change the ECU out because the old one had one of the mounts broken off, so I swapped back to the original earlier tonight with no success.</p><p></p><p>I did unplug the O2 tonight just for giggles to see what it would do... didn't change a thing. The O2 is mounted in the manifold on the older ones, the newer HO motors have it mounted right below in the B-pipe That could be part of the issue, because the bung on the old manifolds is thicker and the O2 doesn't sit fully in the exhaust stream but recessed a little... doesn't seem like it would cause a problem, but who knows. I'll dig into the wires tomorrow and see what kind of numbers I'm getting out of it at full warm temp and compare.</p><p></p><p>Last resort I guess is to swap back to the other manifold to see if that fixes the problem... if it does, I have some work to do because the front part of my exhaust will have to be re-done... I used the old manifold because it dumps close to straight down, instead of back right at my driveline like the later ones... I ran the exhaust down and around the front of the oil pan with the old manifold, only way I could do it and clear the driveline because I'm running a narrowed 60 front.</p></blockquote><p></p>
[QUOTE="NotMatt, post: 1471533, member: 15947"] I've got another throttle body kicking around somewhere that came off a good running rig, so I'll start with swapping that IAC tomorrow. I did change the ECU out because the old one had one of the mounts broken off, so I swapped back to the original earlier tonight with no success. I did unplug the O2 tonight just for giggles to see what it would do... didn't change a thing. The O2 is mounted in the manifold on the older ones, the newer HO motors have it mounted right below in the B-pipe That could be part of the issue, because the bung on the old manifolds is thicker and the O2 doesn't sit fully in the exhaust stream but recessed a little... doesn't seem like it would cause a problem, but who knows. I'll dig into the wires tomorrow and see what kind of numbers I'm getting out of it at full warm temp and compare. Last resort I guess is to swap back to the other manifold to see if that fixes the problem... if it does, I have some work to do because the front part of my exhaust will have to be re-done... I used the old manifold because it dumps close to straight down, instead of back right at my driveline like the later ones... I ran the exhaust down and around the front of the oil pan with the old manifold, only way I could do it and clear the driveline because I'm running a narrowed 60 front. [/QUOTE]
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Jeep 4.0 high idle when warm... driving me crazy
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