LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

What is that noise when you shut off you car?

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Old Apr 7, 2003 | 10:18 PM
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RedRyder518's Avatar
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From: Katy, Texas
What is that noise when you shut off you car?

After turning the key off, what is that sucking noise that comes from the intake? I was told it was the IAC valve opening up, but how does it make this noise...What good is this action?
Old Apr 7, 2003 | 10:42 PM
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Anderson's Avatar
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From: Winter Springs, FL
I alwasy thought it was the AIR pump.
Old Apr 7, 2003 | 10:51 PM
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CODY BEHNKE's Avatar
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The sucking noise is the air from the cylinders. The electric motor noise is the A.I.R. pump.
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