Question about 1996 Jeep Grand Cherokee

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96cherokee after it gets hot and idles forbout4-5min idles ruff give it throttle wants to shut off but if you pump the gas baby it and get it going your ok till you stop !I unhooked vacuum hose to the lil canister in the font bumper an pulled a cap off A VACCUM PORT ON the intake maifold RUNS GREAT !PUT THAT STUFF BACK ON TOOK IT TOO AUTO ZONE ON THE CODE SAYS OXYGEN SENSOR IS LEAN GAS /AIR???

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  • jasonshaffer Jun 28, 2009

    Thats what I've been leaning towards mine has two, but I'm thinking its the heated one (on the manifold)!but then i was thinking it's the IAC I'm stuck between the those two things but I BELIEVE IM GONE WITH THE OXYGEN SENSOR! THANK YOU!

  • jasonshaffer Jun 28, 2009

    AS I SAID THE HOSES I TOOK OFF I PUT BACK ON BEFORE I CODE TESTED IT I HAVE NO VACCUM LEAKS ITS EITHER OXYGEN SENSOR OR IAC I DO BELIEVE!

  • jasonshaffer Jun 29, 2009

    Thank you for helping me out!Its just one of those things !GOT ME STUMPED I APPRECIATE TAKING YOUR TIME TO HELP ME OUT!
    THANKS
    JASON T. SHAFFER

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6 Answers

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Here is the best way for you to check if it is the O2 sensor or the IAC valve. Take your IAC off and soak it in some throttle body cleaner and blow it out with some air. Put it back in and see if this helps. If it does help you need to replace the IAC as it is going out and cleaning it will not be a permanent fix. If it doesn't help at all it will be your heated O2 sensor. Just went through this same thing with a 2001 Venture and it turned out to be the O2 sensor and fixed it right up. Thanks for rating my response and for using FixYa!

Posted on Jun 29, 2009

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Replace the O2 sensor, and you may find your loping still exists.
MAF sensor will need cleaning and/or replacement.

Thanks for using FixYa!!

Posted on Jun 28, 2009

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When u pulled the vacuum hose off you triggered the O2 lean code, sounds like you have a bad MAP sensor or an intake manifold leak.

Posted on Jun 28, 2009

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  • yadayada
    yadayada Jun 28, 2009

    u triggered the code while you had the hoses off, it is retainned in memory for 100 drive cylces or so. that is a long time.

  • yadayada
    yadayada Jun 28, 2009

    what don't u understand about code memory?

  • yadayada
    yadayada Jun 28, 2009

    u can call if u like 925-459-0571

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Oxygen sensor stuck causing adaptive s to go to far causing it to stall so when you disconnect the vacuum hose it alters the adaptives to make it run correctly. It needs an oxygen sensor

Posted on Jun 28, 2009

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The thing I suggest is replace the Idle Air Control sylenoid. It is getting too much air and not enough fuel or vise versa. It's a pretty spendy little part but it is easy to get to right on the front of the throttle body with an electrical connection to it. Had the same issue with my 90 cherokee with the 4.0 inline 6.

Posted on Jun 28, 2009

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Check out the throttle body at the throttle plate and spray off all the carbon right at the butterfly plate or throttle plate. at an idle carbon buildsup around this plate and causes it to idle rough.
just use some carb spray and a very very very clean rag.
do not drop anything in the throttle body.
use superunlead to prevent the buildup from forming again.

hope this helps
thank you
jm

Posted on Jun 27, 2009

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