While replacing the serpentine and supercharger belts, I noticed that two of the pulleys didn’t spin as easily as they should. Rather than wait for them to seize up or destroy another belt, I replaced both the serpentine belt tensioner pulley and the supercharger’s smooth 3″ idler pulley. For more, click on the text link or thumbnail image below.
Pontiac Grand Prix Idler & Tensioner Pulleys Replacement Guide
