Quote:
Originally Posted by homemade87
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 .
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The factory air intake is on it. And, after crank up, you can rev the motor. I posted a link to a video with the sound just before this post.