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My engine is making a knocking noise where my belt is, I was wondering what would cause this. This noise only occurs after driving and I stop at a light or to park. Not sure what it is but my mechanic hasn't heard the noise at all yet as they don't drive it around. I would post a video but you can only hear it slightly inside of the car as I have holes in my exhaust.
 

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which engine 4 cyl or V6

pop the drive belt /serp belt off run motor a very short time ...see if noise is there'

water pump bearing makes a knocking sound
idler pully or alternator bearing a whirring /squealing noise
tappets a fast ticking

plug /patch/ fix holes in zorst as budget allows

is your noise anything like this





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