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Join Date: Mar 2011
Location: Santa Monica, CA
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'99 Jeep Cherokee not idling
My son has a '99 Jeep Cherokee with the inline 6 that is acting a little funky. From time to time it will die at idle. As long as I have the revs above idle it's fine. And once it warms up it does fine. Do you guys think this is a fuel pump or fuel filter issue? I do not have a gauge to determine fuel pressure.
Thanks in advance for the suggestions. |
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11-14-2014, 10:21 AM
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Location: Michigan
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Check engine light on? If so, read the code or codes to get a starting point.
Short of that I would try cleaning the MAF sensor, if equipped as well as checking for loose broken vacuum lines. Air filter clean? EDIT--I did a search on the web and found that it COULD be the Idle Air Circuit sensor.
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11-14-2014, 10:25 AM
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Throttle position sensor dirty?
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11-14-2014, 11:02 AM
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First place I would look is on the side of the intake manifold, there two vacum lines that are connected there, and I see them leak all the time. I think there are 90 elbows on them that lead to plastic tubing, but you can easily cut them off, and make a repair with straight vacum tubing .
If no vacum leaks are found, I would check, and clean the throttle body, then re set all adaptives . Not sure, if you can do this without a scanner, but , after you clean the throttle body, maybe try disconnecting the battery for 10 minutes or so, and then let it re-learn how to idle. Keep us posted, this should be an easy one.
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11-14-2014, 11:08 AM
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I had a 99 Grand Cherokee Laredo with 4.0l that had a similar problem. Would not start without keeping foot on gas and would not idle. Throttle position sensor was bad.
Usually a dying fuel pump can be temporally corrected by banging on the fuel tank with a rubber mallet (near the fuel pump location.) Dying fuel pump is usually precipitated by a more persistent louder whine from the pump. Clogged Fuel filter will usually not clear itself up.
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11-14-2014, 11:49 AM
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Thank you guys.
I'll try it out this weekend and let you know how it goes. |
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11-14-2014, 11:57 AM
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Also clean the throttle body. Gunk builds up around the butterfly and the IAC motor cant keep up at cold idle.
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11-14-2014, 12:04 PM
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11-14-2014, 09:12 PM
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Every XJ that i have owned would stumble the idle once idling for longer then 5 or so mins. Very common.
I would replace the fuel filter as they are only 10 bucks at napa.
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11-14-2014, 10:31 PM
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Clean throttle body. Make sure you get no fluid into IAC and TPS. Most likely need a TPS as well but you can try cleaning IAC area well. CPS can cause stalling but not only at idle - it would happen all over the powerband but mostly when hot and no airflow (idling). CPS failure would be my second guess with first being TPS.
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11-15-2014, 06:08 AM
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Cleaned the throttle body and IAC. So far so good.
It was pretty dirty. Thanks again for all the input. I really appreciate it. |
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11-15-2014, 03:43 PM
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You do not have permissi
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Quote:
Old school. |
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11-15-2014, 10:47 PM
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