Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome! My name is ***** ***** I can assist you with your question. Does the engine stall out at times? Does it start hard at times? Is the check engine light on or are there any codes in the computer?
Hello and sorry for the delay! Do you know the code number in the computer?
Ok, no problem. I can still give you some possible causes as to what can be wrong causing this high idle or engine reving condition.
The most common cause would be either an air or vacuum leak or bad throttle position sensor located on the side of the throttle body. Sometimes the throttle body itself or the throttle body cable/linkage will stick preventing the throttle plate from closing all of the way. This will cause the rpm's to go higher than normal by itself.
Another possible cause would be a bad/lazy idle air control motor. It can stick open causing more air to enter the engine causing this high engine idle
I would start by opening the hood and looking around for air/vacuum leaks. Listen for a hissing sound indicating a vacuum leak. Look close by the air intake system.. intake manifold and gasket and throttle body and gasket and fix or replace anything that is leaking vacuum. Sometimes it is just a sinple vacuum hose or line leaking causing this sort of condition.
If there ae no air or vacuum leaks, I would suspect a bad TPS sensor (throttle position sensor) or a bad idle air control motor. I would go after those next as those two would be the most likley causes of a high idle if there are no air or vacuum leaks.
I am glad I can help!
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Hello! It's Amedee from just answer.
I am just checking in to see how things are going and to see if you need any further assistance?
Please let me know and I will be happy to help!