SOLVED Re: Squeal and flapping sound
Unbelievable. 3 nuts/bolts broke off on the exhaust manifold passenger side.
You got your tick tick sound, then as you accelerate, it whistles(cat screech) with more exhaust flow, then if you get on it, the manifold itself is lifting on and off the head hence the flapping/banging sound.
Saw the tech bulletin on the fasteners, why didn't the original dealer ever contact me, why not GM. The tech bulletin says to replace if brought in for manifold service. Guess if it fails you bring it in. Would have been nice to change them before the failure.
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