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homemade87 · 03-27-2019, 06:45 AM

If you have the air intake off you can here it pretty good . This is normal . It does a little quick test open and close to check to see if there is a problem with the tb binding . If it detects a slight resistance it will throw a code and will not open the tb after starting the engine .

This is GM fail safe test so you dont have a stuck open tb and a run away engine .

03-27-2019, 06:45 AM	#3
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: Noisy DBW Throttle Body If you have the air intake off you can here it pretty good . This is normal . It does a little quick test open and close to check to see if there is a problem with the tb binding . If it detects a slight resistance it will throw a code and will not open the tb after starting the engine . This is GM fail safe test so you dont have a stuck open tb and a run away engine .