[kzag90]

Hey gang - I've been floating around the forums but finally found a reason to actually post. My 2002 Mustang (~200k miles) recently started making a new sound and I was wondering if anyone had an idea what it could be. Video link here:

I can only describe the sound as an intermittent, low-ish pitched rattle. I tried to pinpoint where it's coming from and it sounds a bit louder from the left side of the engine bay (facing the engine) but that's about all I can tell. Any thoughts?

 

[Urambo Tauro]

Welcome!

I'm thinking accessory drive, like maybe a pulley bearing somewhere. With the engine running, use a mechanic's stethoscope (or a long screwdriver) to listen for noise near each pulley. (Obviously, you'll want to touch it to a non-moving surface, like a housing or bracket.) Could be the tensioner, or maybe in that compressor clutch assembly...