90' Cherokee Idle Problem - JeepForum.com

 
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post #1 of 8 Old 08-16-2002, 10:39 PM Thread Starter
ddoffroad
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90' Cherokee Idle Problem

I recently had my throtle positioning sensor replaced but my rpm's sometime ride a little high and often when I start my Jeep they jump up to 3000 and wont go back down, but if I shut it off an restart it it will be ok. I have replaced the plugs and wires no more than a year ago....what can I do?


99 XJ - 4.0L HO, Rusty's K&N Intake, Rusty's 4.5" full suspension, 31x11.50 Swamper LTB's, 15x8 blk Daytona's, clear lenses, Warrior bumper w/ hooks

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post #2 of 8 Old 08-16-2002, 10:41 PM
arpy
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sounds like you still have a TPS problem
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post #3 of 8 Old 08-16-2002, 10:43 PM Thread Starter
ddoffroad
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TPS

Throtle Positioning Sensor problem.....? The mechanic said it could need and injector cleaning......

99 XJ - 4.0L HO, Rusty's K&N Intake, Rusty's 4.5" full suspension, 31x11.50 Swamper LTB's, 15x8 blk Daytona's, clear lenses, Warrior bumper w/ hooks

Down & Dirty Offroad: http://ddoffroad.com/
My XJ site: http://www.cardomain.com/ride/2488225/
My Old XJ Site: http://www.cardomain.com/ride/2058746
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post #4 of 8 Old 08-16-2002, 10:56 PM
arpy
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dirty injectors would cause power loss and maybe an erratic idle, but I don't see how it could cause it to rev to 3000 at startup. Mine did this (although only to 2000) until I replaced the TPS. I know you just replaced it, but maybe you got bad one? You want to fix this soon, 3000 at startup before the oil gets circulating will shorten your engine's life considerably.

by the way, check for moisture/corrosion/damage in the connector and wiring to the TPS, part could be good and these things preventing it from proper operation.
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post #5 of 8 Old 08-16-2002, 11:01 PM
arpy
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and clean your injectors just for the hell of it, sometimes I'm full of sh@@, much like your injectors. Like I said I doubt thats your prob with the high revs, but if you haven't done it lately its a good idea anyway. I like Chevron Techron injector cleaner, the cheap stuff ain't gonna make it.
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post #6 of 8 Old 08-17-2002, 08:52 AM
williak
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My 88 did just that prior to the TPS carping out. Mine would also drop to idle while you were going down the road (of course, this would only happen to the wife and not me, smart car). I replaced the TPS and the high idle and drop to idle problems stopped. I still have an low and irratic idle though, but thats another problem.
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post #7 of 8 Old 08-17-2002, 10:44 AM
CruzNlife1
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Yeah i would check all wiring and connectors etc.... first, and as for the high idle at startup it could be when the new sensor was instlalled the idle skrew may have been touched

1989 Jeep Cherokee XJ LIMITED....2door.... Auto, NP242 4x4...

1996 Ranger Supercab....

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post #8 of 8 Old 08-18-2002, 12:38 AM Thread Starter
ddoffroad
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TPS

Yeah, if it does come down to the TPS then I can get it replaced at the dealer I bought it from. Does anyone know the warranty on the Mopar TPS?

99 XJ - 4.0L HO, Rusty's K&N Intake, Rusty's 4.5" full suspension, 31x11.50 Swamper LTB's, 15x8 blk Daytona's, clear lenses, Warrior bumper w/ hooks

Down & Dirty Offroad: http://ddoffroad.com/
My XJ site: http://www.cardomain.com/ride/2488225/
My Old XJ Site: http://www.cardomain.com/ride/2058746
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