Reviving the thread, I have the exact same problem. Replaced the belt (OEM) and tensioner (Gates) about 6 months ago. Turned out in my case the tensioner (Gates) decided to crap out. The noise at first was faint but has gotten a lot worst. The rattling was from inside the tensioner, most likely a defective spring or something.
I have a OEM tensioner on order online, cost twice as much as the Gate one but should had went that route in the first place and save myself the headache. I am very surprise the Gates tensioner failed so early ....
I have a OEM tensioner on order online, cost twice as much as the Gate one but should had went that route in the first place and save myself the headache. I am very surprise the Gates tensioner failed so early ....
