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Old 08-06-2014, 11:20 PM   #1
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Idle Issues 2000 TJ

I've been scouring the forums and have yet to find any "this is what fixed it" posts, so here goes.

I've got a 2000 TJ with a 4.0. For quite a while now, I've experienced intermittent 2 types of idle issues... the first one that came around was a high idle (sometimes up to 3k depending on how far down the throttle was being pressed when let off to shift) This usually goes away by pulling over and letting it idle.

The second (and most frustrating issue) is the low idle issue that occurs at random - sometimes at startup, sometimes down the road when coming to a stop... it'll idle down and more often, shut down. There is also a noticeable smell of gas at startup.

Now for the interesting part - this was taking place before my previous engine blew, and currently with the "new" engine. Prior to the old engine's death, I did replace both O2 sensors (non-cali jeep). I am also getting an IAC code - as I was with the old one, too. When the engine was replaced, so was the TB and intake. So the main things that remained the same throughout are the exhaust, the PCM, and vacuum system.

Tomorrow I have an appointment at the exhaust shop to have the cat cut off of it. If that doesn't fix it, I'm not sure where to go next - any info is appreciated
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Old 08-07-2014, 01:45 AM   #2
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Mine would idle very high. I found a vacuum hose that had come off and put it back on. Problem solved.

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Old 08-07-2014, 04:32 PM   #3
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You might also want to check the TPS (throttle position sensor) wires and connections, and do an IAC (idle air control) cleaning if it has not been done in a long time
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Old 08-07-2014, 07:23 PM   #4
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I too would suggest cleaning the IAC with a carb/choke cleaner and a rag. If that doesn't work then definitely consider changing your TPS. I had similar problems this last winter, which was especially frustrating when there was so much snow to go play in. The problem ended up being my TPS. I first purchased a TPS off the internet to save a few $$$.... Not with it. Cont'd having problems a few weeks later. Ended up going to to a local parts store and bought a replacement and haven't had an issue since.

Both solutions are very easy to do and cost are minimal. Hope this helps.
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Old 08-10-2014, 12:32 PM   #5
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well, since my original post, i have had the cat removed and swapped throttle bodies with a new set of iac and tps. so far, there is not a whole lot of difference that i can tell. im sure the computer is still re-learning with so many changes. will see how it goes from here. as always, suggestions are helpful
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