Originally Posted by TransAm-98
Moisture on the pulleys can cause a chirp. But most of the time on LSx engines it's because of a tired idler pulley or tensioner.
In my case putting a single drop of water on the grooved side of the belt eliminates the noise.
I tried putting a drop of water on each pulley - and on top of the belt - still have the chirp. but as soon as the water hits the grooves - no more chirp.