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Thread: Low idle problems with 4 L

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    Low idle problems with 4 L

    Pulled the jeep out of winter storage, put a new battery in it (old one dead) and it has been giving me issues when in low idle (will sputter, rpms seem to go lower then normal, and check engine light comes on sometimes). So far I have replaced fuel filter; issues remained; cleaned throttle body and idle air control valve. Still issues remained; so replaced iac valve/motor; this seamed to make a difference, but still have same issues. What should the rpm be at when at idle and do you guys have any suggestions...I'm out of ideas...help.

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    push the easy button and get a code reader... I think all my 4.0L's idle about 700/800rpm or so.. I'm no mechanic but it sounds like you tried the right path. have you driven it for any period of time? the battery was dead the whole time? the computer probably needs to 'learn' how to control the idle.. take it for a drive!

    have you checked all the vacuum lines?

    what year is it from?
    Last edited by sk8snwmx; 05-22-2014 at 06:46 AM.
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    this may sound stupid since you replaced the battery but CLEAN the terminals. i replaced the started after a trail run last weekend and then the jeep wouldn't stay running. after 4 hours of messing with it i cleaned the battery posts and terminals with a wire brush and now it idles better then ever.
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    Kind of sounds like the TPS
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    Quote Originally Posted by Curt's_97 View Post
    Kind of sounds like the TPS
    Agreed...
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    If your new battery is not fully charged, you will get the symptoms you have described.
    The batterty needs the proper voltage for the engine to run correctly. I had a battery
    with a bad cell, and my jeep reacted exactly like yours. Charge that battery properly
    with a battery charger, and you will most likely be fine.

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    Would the low voltage show up on the voltmeter gauge? The problem did start after I put in the new battery... shouldn't it get fully charged after running it for a while...the jeep runs fine when I'm putting the throttle down... its just when its at low idle that it sometimes goes squirley.

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    You should not rely on your vehicles charging system to charge a low battery. A proper battery charger
    is required to this job. The stock volt gauage will give you a rough idea, but a multi-meter would be the
    best bet to check the condition of a battery and the charging system.

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    Quote Originally Posted by jeep pilot View Post
    You should not rely on your vehicles charging system to charge a low battery. A proper battery charger
    is required to this job. The stock volt gauage will give you a rough idea, but a multi-meter would be the
    best bet to check the condition of a battery and the charging system.
    Doubt they sold him a low battery

    Quote Originally Posted by 95Jeep View Post
    put a new battery in it (old one dead)
    Quote Originally Posted by 95Jeep View Post
    The problem did start after I put in the new battery

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    Assuming this is a 1995 Jeep of some variety (XJ? YJ? ZJ? All should use Chrysler OBD-I PCM)

    Lots of things can cause a fluctuating idle, from bad tuneup parts to a busted TPS to corroded battery wires to shit in the fuel line to vacuum leaks... ESPECIALLY on models with a vacuum FPR and MAP sensor half a lightyear away from the throttle body.

    Did you get the code? The PCM is trying to tell you what's wrong.

    Idle on these things is 750 RPM.
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    Low idle

    Quote Originally Posted by salad View Post
    Assuming this is a 1995 Jeep of some variety (XJ? YJ? ZJ? All should use Chrysler OBD-I PCM)

    Lots of things can cause a fluctuating idle, from bad tuneup parts to a busted TPS to corroded battery wires to shit in the fuel line to vacuum leaks... ESPECIALLY on models with a vacuum FPR and MAP sensor half a lightyear away from the throttle body.

    Did you get the code? The PCM is trying to tell you what's wrong.

    Idle on these things is 750 RPM.
    Thanks for the info, I am going to get the code read today, how would you flush a gas line?

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    put in some good new fuel and drive the piss out of it. then see if its still acting up. unless you get an odvious code leading you to the culprit. a corooded sensor pulg from sitting can cause havoc.
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    Got the codes read today....first time in the 5 years of owning the jeep...took me and mechanic a while to find plug! Anyway, 2 codes came up... Code 33 air conditioner resistor and code 24 tps sensor circuit resistance high. So I think i will swap out the tps sensor this week and see what happens. Stay tuned

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    Quote Originally Posted by Curt's_97 View Post
    Kind of sounds like the TPS


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    Quote Originally Posted by Curt's_97 View Post
    im the other guy in that .gif

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    I love those guys!!! And thanks for the help... it was funny watching the 3 mechanics try and find my OBDI socket so the codes could be read.

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    Final answer.... TPS sensor... its amazing what you can fix when you get the codes read. Plugged in new sensor....drove jeep...jeep computer made adjustments...jeep running good....thanks again everyone.

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    Quote Originally Posted by 95Jeep View Post
    it was funny watching the 3 mechanics try and find my OBDI socket so the codes could be read.
    Now go buy a code reader when its on sale at crappy tire.... probably cost about the same in labour that you paid for the tools to find a blue connector.
    Last edited by sk8snwmx; 06-01-2014 at 08:52 PM.

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    Only cost 4 coffees... guys are good s%#@... I bring them enough stuff... they don't charge for little stuff

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    Quote Originally Posted by sk8snwmx View Post
    Now go buy a code reader when its on sale at crappy tire.... probably cost about the same in labour that you paid for the tools to find a blue connector.
    I'm assuming it's a 95 YJ due to his name it's OBD1 and the scanners tend to be harder to find and more costly.

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