Argh! Help with idle
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Junior Member
Joined: Oct 2009
Posts: 65
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From: Tacoma
Year: 1989
Model: Cherokee
Engine: 4.0
I know this has been covered multiple times, regarding the weird idles issues, jumping up to 1000+ sometimes and then dropping to normal, or rough idle or hesitation at take off from stops. I know its possible its a sensor of some kind. I do have my TPS adjusted correctly. I also cleaned out the throttle body and the Idle Stepper Motor, (IAC), a few weeks ago. I would just like a general opinion on what I should throw money at. I did a quick check on auto zone and if I replace all the sensors that deal w/ idle and emissions etc, it's roughly $400. I know this is some kinda phantom issue, but again, I'm just looking for your expert opinions on this. Thanks in advance.
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
why throw money at it get a meter and test the sensorshttp://www.lunghd.com/Tech_Articles/...iagnostics.htm
Member
Joined: Jun 2011
Posts: 104
Likes: 1
From: Rocky Mountain House, Alberta, Canada
Year: 1988 & 1990
Model: Cherokee
Engine: Inline 6
I had the same problem when I first got my jeep, it drove me nuts until I figured it out. I would start by checking for a vacuum leak. There are lots of vacuum lines under the hood and a broken line can cause similar problems to what you described.
CF Veteran




Joined: Nov 2010
Posts: 5,841
Likes: 117
From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
Cleaning the idle air control does not guarantee a return to function. It works sometimes, but if there is a true electrical or mechanical issue, the only thing that will resolve is replacement.
And definitely perform full testing on that throttle position sensor.
And definitely perform full testing on that throttle position sensor.
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