Quote:
Originally Posted by E92_William
You can spray it on the pulley bearing and this sometimes can work to diagnose things. However I think your best bet is removing the belt entirely and starting the engine and see if the sound still is there, that way you can point towards something that is driven by it or not
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Def sounds like either a pulley is shot, or a heat shield is rattling something fierce. Try wiggling the pulley. If it has excessive play that's probably it.