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Jeep Wrangler YJ
YJ General Discussion
Motor wants to idle at 2000rpm
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<blockquote data-quote="machoheadgames" data-source="post: 430400" data-attributes="member: 18789"><p>YJs are a mess as far as idling is concerned. While y’all are staying too high, my 4.0 has always dipped way low over the years at random stops. And by low I mean like 300 rpm, feeling like it’s going to die, shaking the whole Jeep the entire time. I have changed virtually everything including the PCM. No changes whatsoever.</p><p></p><p>Part of me thinks it’s a physical issue, like the timing chain or something. Hard to say. I recently put a New double roller timing chain so we’ll see if that helps.</p><p></p><p>This whole post is to say that no one seems to have a similar experience, and for whatever reason, I can not establish what is “normal” as far as idling in a YJ goes. The TJ was MUCH better about this, they all idle at 750 on the dot pretty much no matter what. Very comfortable and solid feeling. I think the more modern tuning of OBDII engine management contributes a lot to that. The very rough edges of OBDI probably aren’t capable of running an engine super smoothly.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 430400, member: 18789"] YJs are a mess as far as idling is concerned. While y’all are staying too high, my 4.0 has always dipped way low over the years at random stops. And by low I mean like 300 rpm, feeling like it’s going to die, shaking the whole Jeep the entire time. I have changed virtually everything including the PCM. No changes whatsoever. Part of me thinks it’s a physical issue, like the timing chain or something. Hard to say. I recently put a New double roller timing chain so we’ll see if that helps. This whole post is to say that no one seems to have a similar experience, and for whatever reason, I can not establish what is “normal” as far as idling in a YJ goes. The TJ was MUCH better about this, they all idle at 750 on the dot pretty much no matter what. Very comfortable and solid feeling. I think the more modern tuning of OBDII engine management contributes a lot to that. The very rough edges of OBDI probably aren’t capable of running an engine super smoothly. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Motor wants to idle at 2000rpm
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