Our cars have a timing chain Dampener/Damper.

It's kind of like a tensioner, does the same job, just a different style.

And no, I mean the tensioners for the serpentine belt, and the supercharger belt (if you have a GTP)

Just pop the hood, and have someone start the car, while you look. It's really easy to see if they are chattering. They'll rock back and forth, and the actual noise is caused by the tensioner hitting the stop (fully disengaged)