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Old April 12th, 2018, 13:50
patnok patnok is offline
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'92 XJ 4.0 not idling correct

so it stated this almost stalling & then reving up to 1500rpm....changed idle control valve,map sensor & throttle position sensor.....no change...
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Old April 12th, 2018, 20:02
freggie freggie is offline
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Re: '92 XJ 4.0 not idling correct

check for vacuum leaks on intake manifold, rubber and plastic lines. I had a small vacuum leak on the intake manifold, very small hole and it made my jeep idle at 950. Used electrical tape and now it idles fine
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Old April 13th, 2018, 08:33
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Rob Mayercik Rob Mayercik is offline
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Re: '92 XJ 4.0 not idling correct

Don't forget the vacuum reservoir - if you have a stock front bumper, it's tucked inside that on the passenger side, is about 5 inches in diameter/about 8 inches long.
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Old April 16th, 2018, 16:52
patnok patnok is offline
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Smile Re: '92 XJ 4.0 not idling correct

it was the PCM............thanks for everyone's ideas! I know a lot of stuff that is now new & & did some over due maintenance.

ps, jeep hasn't had that canister for years!
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