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I have a 2001 Cehvy Venture van that has recently started idling at high speeds after being started. It will run for a few seconds at normal RPM then jump to a fairly high RPM. WHile driving, it will h old a speed of 45 MPH because of the engine speed. I am suspectng the idle air control valve but am not sure. Has anyone seen somethng similar. If so, where is the valve located so I can check it.
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I have the same problem with my '01 venture. Brought it to my mechanic just last week who found nothing during system scan and test drive. Itoccursduring hot weather (88+). Idle won't kick-down via accelerator but doesreset after turning vehicle off but resumes high idle after acceleration. This van has been an electronic nightmare - climate fan speeds fixed twice,rear air vent doors stuck, dash gets super hot with stereo use. The intake manifold gasket was replaced as well (overheating and fluid loss). Other than than that engine and drive train are solid. Vans accelerates, handles and rides really well and hauls 8 people and tons of gear.I hope we can get some help with that idle. It can't be healthy for the motor.
I have experienced similar problems with our van. On warm days (+75 degrees), not only does it idle excessively fast but, in slow or stop and go traffic, the engine overheats and stalls. Frustrating on the expressway. Our mechanic as well as local Chevrolet dealership conclude there is no problem with the engine. Love the van but must find a solution to this problem.
My van has been idling back and forth also. It also hesitates gears. I found out that I needed a throttle position sensor. If you look this up it will show you the symptoms that happens when this goes bad. Idling is one of them. Hope this helps. The part itself cost around 40.00. You can find someone to put it in for you. Not sure how much labor will be.