In park or drive I can hear a revving sound

2012 CHEVROLET CRUZE
85,000 MILES • 1.4L • 4 CYL • TURBO • 2WD • AUTOMATIC
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TERRY MYRR
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In park when started there is a revving sound for a few seconds. Also, when I am stopped at a light I hear the same thing. I am just wondering if this is normal for a turbo engine?
May 26, 2018 at 7:01 PM
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JACOBANDNICKOLAS
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Hi and thanks for using 2CarPros.com. If the engine idle is fluctuating, chances are you either have a vacuum leak or the idle air control valve (IAC) is not working properly.

Here are general directions for finding a vacuum leak:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Here are general directions for replacing an IAC:
https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

The IAC is located on the throttle body. I found a picture online so you can identify it. Picture two, item 4 is the throttle body on your engine.

I hope this helps you. Please keep in mind, a turbo can make a spooling sound. The information I provided is related to the engine speed changing.
I hope that is what you were looking for.

Let me know if you have other questions.

Take care,
Joe
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May 26, 2018 at 9:12 PM