Question about 1996 Jeep Grand Cherokee

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98 jeep grand cherokee limited 4.0 litre. starts up, during warm up process engine will idle irradically and stall out. starts back up and does the same thing. no check engine light on. cleanrd throttle body, good compression, good spark. i checked to see if it might have been the map sensor by starting the motor and then pulling the connector off the map sensor, the rpm's changed a slight bit but went to normal and didn't stall out. i was thinking about checking to see if i have fuel pressure on my fuel rail, but i have no gauge. any suggestions or comments are greatly appreciated. shops i've taken it to are stumped or they say it could be this...

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  • yadayada
    yadayada May 11, 2010

    did u clean the idle speed control air bypass valve? after cleaning did u didconnect the battery for 5 minutes to allow idle relearning?

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98 jeep grand cherokee, starts fine but then dies and will not run, after it dies it will start right back and do the same thing, can not get it run, any help is always appreciated

Posted on May 31, 2011

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Could be TPS (Throttle Position Sensor) located on throttle body or CPS (Crankshaft Position Sensor) located on tranny bell housing.

Posted on Mar 17, 2009

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Does this thing have a throttle body that looks like a computer-controlled carburetor?

If so, start motor and verify that it behaves irratically and then stalls.

then, spray WD-40 liberally around base of throttle body where tb meets intake manifold.

Start motor...

Does the problem go away, at least whilst for a little while?

Yes?

You gotta vacuum leak. Replace gasket under TB and tighten bolts to factory spec.

Posted on Mar 09, 2009

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I had a similar problem with a Ford Excursion, it turned out to be intake manifold gaskets. It would stall then start right up again, it ran fine during warm up. But, once fully warmed up it would stall at stop lights and stuff like that. I did get a check engine light, the code was lean condition. I don't know on a Jeep, sorry I can't be of more help.

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Runs like a dream now. Clunking is gone and idle speed is just right.

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