1. 2001 4.0 Engine issue

    so my daughters jeep is begging me to sell it but i really dont want to. this little thing has given me fits since weve owned it.(bought it used) but i was ok with that, i figured once she is done with it then ill keep for myself and have a toy. but man this thing is stubborn, its as if it just doesnt like not having an issue. Ive been chasing a intermittent starting issue that i think i finally solved and now got hit with a new one. Friday my daughter was getting ready to leave school and it wouldnt start. i was thinking oh here we go again. but she said this time was different. So i get to her school and start, or try to start her jeep. it turned over but wouldnt start. so i feathered the accelerator and it would start but if i let off the accelerator it would instantly die. So to get home, which is only a couple of miles, i had to feather the accelerator and brake. once i get home i backed into the garage so it would be easier to work on, let off the accelerator it would stay running but it had a a really low idle. Not sure where to start so any leads would be great. Thanks everyone.

  2. Re: 2001 4.0 Engine issue

    Idle issues with the 4.0 usually points straight to the IACV " Idle air control valve ".
    Located at the throttle body, take it out and clean it, maybe 10 minutes. It's a very common issue but an easy fix.

  3. #3
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    5,955

    Re: 2001 4.0 Engine issue

    As above clean the TB band IAC.
    Check fuel pressure.
    O2sensor
    Temp sensor
    CKP



    Regards,
    JPNinPA

    Sent using TapTalk
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

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