I replaced the whole tensioner assembly. That did not fix it. I removed the water pump and checked it. That doesn't appear to be the problem. However, I broke off one of the power steering bolts in the block in the process, and I am trying to get that taken care of. What a PIA. I will have to take it to someone to get that fixed. The rattle still isnt fixed though. However, it does mostly go away when the A/C is turned on.