Join Date: Jan 2012
Location: Piedmont, NC
Thanked 490 Times in 380 Posts
Probably the tensioner. Factory ones are noisy to begin with, then as they age they knock more and more. Mine got so bad I thought I had a bearing going. Replaced with some Lowes hardware and made it a manual adjustment; never had another issue.
Tis better to be thought a fool and remain silent, than to open one's mouth and remove all doubt.