Quote:
Originally Posted by Kiske
So engine #toomany's low rpm loud tapping noise goes away when the drive belt is off. I feared that bank 1 on the new engine had a loose rocker. Cannot visually find amything wrong with the pulleys but, I suspect the waterpump due to the location of the noise. It doesn't make a noise when spun by hand, there is a super tiny ammount of back and foruth movement when wiggling it though...
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Very possible it's the water pump IMO.
My Trans Am developed a horrible idle rattle that sounded like nuts and bolts in a coffee can. After an hour checking every piece of heat shield and sheet metal on the front of the car I took the serp belt off. Tiny amount of play in the belt tension pulley. Put a new one on and the noise went away.