Noise from Air Filter Housing 2000 GM
 

A loud humming virbration noise is coming from the air filter housing on my 2000 GM. When I tap or shake the air filter top and housing the noise stops for a moment then retarts. I took the top off and with the motor running, the noise is still present. When I move the flexible hose going to the air filter housing the noise sometimes stops. Any I idea what's happening? I replaced the idle air flow valve last week and all was fine.

Sounds like it maybe the Idle Air Speed Control Valve. A simple repair two small bolts, an electrical connector, and a hose.

Freedom, you're right. I nosed around and found it was the idle air valve. I just replaced the idle air valve last week. Car ran fine.
Bad part from NAPA. They will replace but have to order part. Will be here tomorrow. Meanwhile, I saved the old part. Cleaned gunk out with carb cleaner. I reinstalled old part and the noise is gone and the idle is fine. I know this is only a temp fix and will install new part tomorrow.

cleaning the IAC is all that is usually necessary... they get gummed with oil and a good cleaning will make it last another who knows how many miles... done this to many cars and never had to replace the IAC before

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