Question about 2005 Chevrolet Express

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After cranking it idles fine but after about a min. it starts idling really high. I can't find any vacuum leaks. is there any of the controle modules that would cause this ?

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Are you sure that this is actually idling high? If you put you foot on the brake, and put into drive, would the vehicle jump?
The reason that I ask, is the cooling fan has a very similar sounding effect, when it kicks in. If this were to be the cause, you would alter it's noise, slightly, by putting into drive, but the vehicle would not jump excessively?

If the vehicle is actually reving high, I suggest paying for a diagnostic, presumeing you have no error codes........ Many things can cause higher idle, many of them NEEDED, they deal with issues like temprature, emissions, some models charging....etc. get an opinion.

Your vehicle, by the way, has drive by wire, meaning there is not actually a pull cable going from the foot pedal to the throttle plate..... So, you need to inquire, programmically, with the computer, typically these tools are too expensive for home use....get an opinion from a good shop, or maybe the dealer.... At least the dealer would also look for recall issues for you...

Posted on Mar 11, 2011


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