Quote:
Originally Posted by AlanAZ
Take the belt off, and spin the pulleys by hand, you can tell if they're shot or not (watch the videos on the previous page.)
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In the video, the guy shows how the bad pulleys free wheel spin and also have a grainy sound.
What if you have just a idler pulley that free spins? Meaning if you rotate it, it spins without any resistance? It doesn't make that sand grainy sound. Is it still bad?
I'm trying to diagnose a sound from my car, not sure what's causing it or exactly where it's coming from.