1999 Jeep Cherokee Sport-surging at idle
05-20-2016, 05:20 AM
#1
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Year: 1999
Model: Cherokee
Engine: 4.0
1999 Jeep Cherokee Sport-surging at idle
I have a 1999 Jeep Cherokee Sport with the 4.0, auto 160K on the odometer. I did a tuneup about 5K miles ago (plugs, wires cap & rotor). I noticed lately that at idle sometimes I have a surging problems. Tach goes from 600-1100 rpms. I have to put her in neutral to prevent stalling. It only lasts a minute or so and then everything is back to normal. I do run the AC all the time. No over heating problems, (new water pump & radiator). No warning lights. I did notice last night that I took a hard turn in a parking lot and the engine stalled out. Started right up again. I did run some Sea Foam through the gas tank and no difference. Any suggestions? Thanks in advance. You guys have saved me a lot of $$$ in the past 5-6 years.
05-22-2016, 07:13 PM
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Year: 2000
Model: Cherokee
Engine: 4.0L with throttle body spacer and cold air intake, bored throttle body, #784 injector upgrade
I have had this problem in the past ( still not completely gone ) and what I ended up having to do is clean the throttle body out several and went over all my grounds. The biggest problem for me ended up being that my Idle Air Control was getting pretty gummed up. Hope this helps.
05-22-2016, 07:48 PM
#3
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IAC, ebay. Also check for any play in the distributor shaft side to side. With that mileage you can figure on replacing it. Use only mopar cps, I have 2 autozone ones in my glove box waiting to go back. Ended up putting the original cps with 200k back in the dizzy runs like a swiss watch/.
05-23-2016, 05:42 PM
#7
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And of course the ever present vacuum leak. Should be a routing diagram under the hood. Good idea to just buy some hose and start replacing at the manifold.
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05-24-2016, 05:52 AM
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Year: 1999
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Engine: 4.0
05-24-2016, 05:54 AM
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Year: 1999
Model: Cherokee
Engine: 4.0
IAC, ebay. Also check for any play in the distributor shaft side to side. With that mileage you can figure on replacing it. Use only mopar cps, I have 2 autozone ones in my glove box waiting to go back. Ended up putting the original cps with 200k back in the dizzy runs like a swiss watch/.
05-24-2016, 05:56 AM
#10
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Year: 1999
Model: Cherokee
Engine: 4.0
Good idea. I recently degreased everything under the hood and sprayed engine detail liberally. I like working on a clean engine. Will check the hoses. Thanks.
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