Question about 1989 Jeep Grand Wagoneer

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89 jeep high idle problem

I have an intermitant high idle problem. at times when i start it the idle is up around 2500rpm and nothing i do seems to help it go down. i have replace the IAC valve and that helped for awhile but now it is doing the high idle thing again. anything else i can check??

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  • jhonjjt Feb 09, 2009

    I have the same problem and also replaced the IAC valve and nothing changed. I still have a high Idle, at 3000 RPM.

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6 Suggested Answers

  • 958 Answers

SOURCE: high idle 1997 Madza 626 4 cylinder auto transamission

hi,
if i can offer another solution,
do you have air conditioning in the car?
was it on while this problem is going on?

a/c has this idling riser to compensate for the load of the compressor.

maybe this is the fault. as the compressor kicks in, normal rpm appears, as the compressor kicks out, and the idling riser did not go down , then you will have a high rpm.

just a thought,

drcool

Posted on Oct 19, 2008

  • 19 Answers

SOURCE: 1997 buick lasabre custom high idle, transmission, stalling

had same problem i would check the Idel Air Valve and also check all of your vaccum hose lines makeing sure there are no cracks or splits in rubber connectors if there is repair immediatelt because over time they start to dammage the internal parts fo the engine and if youve replace tps mass air etc. sounds like a vaccum hose problem

Posted on Feb 10, 2009

  • 150 Answers

SOURCE: idle at 1500 to 2000 rpm

Most likely the throttle body gasket (between the throttle body and the intake manifold) is leaking.

Posted on Feb 12, 2009

emissionwiz
  • 61292 Answers

SOURCE: fast idle after warm up .already changed IAC valve

fast idle is many times caused by a engine intake vacuum leak, use a can of carb spray and spray the top of the engine for leaks, if u hit one u will hear the eng change idle speed, also look for split or leaking vacuum hoses.

Posted on May 20, 2009

Molson02536
  • 3854 Answers

SOURCE: IAC Valve Location - 1996 Jeep Grand Cherokee

The idle air control valve is located on the back of the throttle body. It has an oval electrical connector and two torx screws holding it in. Unplug the connector, remove the two screws then lightly tap the body with a soft faced mallet to loosen it from the body. 
Once you have it out and prior to installing a new valve clean the seat inside the throttle body where the idle control fits. This must be very clean! Installation is in the reverse order. 
 To save some cash, pull the valve out and clean it with throttle body cleaner, this usually fixes the problem for quite a while.
Good luck and hope this helps.

Posted on May 28, 2009

  • 14 Answers

SOURCE: IAC control valve. Locato\ion 2002 ford escape

If it's not idling and has problems starting, it's probably the IAC motor. It's located on the throttle body. Follow the airfilter box all the way to the engine, where the rubber flex hose attaches. The throttle body should be the first aluminum part you come to. Attached to the side you'll find small little aluminum part with a small wire harness attached. Unplug it, take the IAC motor off and clean inside with carb cleaner. This should fix the problem with the idle.

Posted on Sep 11, 2009

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