Question about 2000 Jeep Grand Cherokee
Looks like a problem with the idle air control stepper motor. Many times its just dirty and needs to be cleaned.
Posted on Feb 03, 2015
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Posted on Jan 02, 2017
If you haven't changed the plugs or had the fuel system cleaned, now would be a good time to do it. The number 1 culprit for rough idles is dirty injectors or plugs. You can try an injector cleaner in a can (or bottle) for under $10 and see if it helps, and then work from there. If there isn't any improvement then if you are able to, check the plugs for any gunky buildup and if you find a bad plug, make sure you replace them all (or have them replaced) at the same time.
Posted on Aug 03, 2009
The throttle plate is supposed to be closed at idle...Idle air enters through a port controlled by the iac valve which takes its instructions from the computer. BUT...the computer only knows what it has been "told" by other sensors...throttle position sensor map sensor and manifold air temperature sensors all have a lot to do with this. The iac valve can be removed and cleaned with carb cleaner, as can the passages that lead to and from it. DO NOT turn the plunger on the valve and don't loose the small "o" ring seal.
Always check all vacuum hoses and connections before working on other parts. Often you will find a small vacuum leak that when corrected avoids major work. You can test nearly all components using a digital volt ohmeter and a manual such as chiltons or haynes as a guide. (cheap...around twenty bucks) Careful testing avoids buying expensive parts you don't need.
Ask if you need specific help with anything.
Posted on Sep 24, 2009
Testimonial: "thanks thundergod - i am selling the vehicle as is and will relay the info to the buyer"
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