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  1. TJ Technical Discussion
    Hello, I have a 98 Jeep Wrangler TJ. 4.0 Manual. My check engine light came on and at first there were no symptoms. Shortly after, while idling at a stop light, I noticed my RPMs were jumping from ~900-1200 so I went to an auto parts store and they told me it was my TPS. I purchased a new one...
  2. YJ Technical Discussion
    So Ive been having rough idle issues with this jeep since i bought it. I did a leakdown test to reveal i had an intake valve on cylinder 1 leaking by. I replaced the head thinking that would get everything running right. But it didn't. So my symptoms are very rough idle, it sounds like its...
  3. YJ Technical Discussion
    Took over a jeep project that has been sitting in a pals garage for a few years now. His dad worked on it before passing, so it's got new belts and guides, and all new fluids everywhere but the brake lines. The man was no mechanic though. I got it back running around the block by cleaning...
  4. YJ Technical Discussion
    Hey I recently installed a aftermarket AC into my 93 yj and I have noticed that the idle speed is way too low. It seems as if the engine is about to stall however it has not done so yet. It occurs when I am about to stop and I put the clutch in the rpms drop really quick. However if I turn the...
  5. TJ Technical Discussion
    i have a 1997 jeep wrangler with the 2.5 i4 with an ax5 trans. recently anytime i push the clutch in to stop at a red light the rpms will drop to roughly 1000-900 to idle, then after 2 seconds the rpms drop significantly down to about 200-300 and it will idle really rough and low until i come to...
  6. YJ Technical Discussion
    I did the HEI conversion to my jeep a couple weeks ago and while it runs good, the idle is off a little. I think it might be something to do with timing, but I am not used to working on carbureted vehicles so I am not the best at it. So here is what I have attempted, and it has made it better...
  7. TJ Technical Discussion
    Good evening WF, I wanted to throw out my situation with an idle issue and associated P0505 code (IAC valve and/or circuitry). I've been chasing this issue for 6 weeks now, largely with the help of this forum and the gurus (Jerry - :worthy:). At this point I'm near to calling the PCM...
  8. JK Technical Discussion
    My 2012 Jeep Wrangler Unlimited Rubicon will stall out at idle at random. When started the RPMs will be at 900 and then stay at 600-650 RPMs consistently. When the jeep stalls, you can feel a sputter and then the jeep dies. It has never stalled when the RPMs are above 1000... When I am driving I...
  9. JK General Discussion
    My 2012 Jeep Wrangler Unlimited Rubicon will stall out at idle at random. When started the RPMs will be at 900 and then stay at 600-650 RPMs consistently. When the jeep stalls, you can feel a sputter and then the jeep dies. It has never stalled when the RPMs are above 1000... When I am...
  10. TJ Technical Discussion
    Ok, my 98 Jeep Wrangler (in Japan if that's important at all) has a recent issue where when I rev the engine and when driving and let off the gas the rpms drop way below idle and sometimes dies. It idles smooth at about 750 no problems, but give it gas and when it comes back down it dips to...
  11. TJ Technical Discussion
    He Y'all, I've got a high idle problem with P1294 code thrown(sometimes) I'm trying to figure out. She'll start out with an idle about right typically when cool, but after she warms up idle will sit anywhere between 1500 and 2000 RPMs. What I've done so far... Cleaned Throttle body and...
  12. YJ Technical Discussion
    Feel like I've been searching the forums forever now so decided to make a thread on this. I've been fixing up my YJ as problems appear and it's constantly had an issue where if I'm idle for too long the rpm starts dipping and around 500 the car will just give out. After it turns off it takes a...
  13. TJ Technical Discussion
    Ok, so I know there are already tons of posts about TJ's running rough/rich. I have read through pages and pages of these but have yet to find one that solved my problems. To start I will give the vehicle info and what has already been done. 2000 jeep TJ 4.0 3 spd auto 140XXX miles What...
  14. TJ Technical Discussion
    I have a 98 Jeep TJ 2.5 SE. I just swapped the motor from a 95 YJ. Swap went beautifully for a first time but now i'm running into the issues. When I start my Jeep it idles at 1,000 rpms. Once I gas it to around 2k rpms or more, it idles at 2k rpms! It'll idle at 2k for a while and then maybe go...
  15. JK Technical Discussion
    Hi, I recently purchased a 2008 JK. Last week I had it inspected and in the shop to do some repairs including a new intake manifold gasket. I only drove for a few hours since getting it and taking it to the shop but did not experience this problem so far as I can tell. Since driving it home...
  16. TJ Technical Discussion
    I'm no mechanic and this 4 cyl. 2.4 L 2003 wrangler has some ghosts, so it should be a fun project. I just towed it back to Salt Lake from the desert where a small shop and dealer both looked at it shortly without figuring it out. Any input is much appreciated Symptoms... 1) Won't start...
  17. TJ General Discussion
    So I'm driving home last night, and the jeep is running totally normal. I come to a stop to park, and the idle drops to just above the 0 mark on the rpms. I can rev the engine without troubles at this point but everytime I let off the idle drops back down to just above the 0 mark. I went out...
  18. YJ Technical Discussion
    When I quickly tap the gas pedal at idle (~680) the RPMS drop for a moment down to 400ish before recovering. She never dies from doing this, but what would cause this to happen? Motorcraft 2150 & nuttered. Havent been able to find an answer out there, but that may be because I am not searching...
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