Maybe could be the motor mounts,When I'm accelerating, especially from a stop, I'm hearing a subtle grinding in the lower RPMs, rattling noise. It sounds like it's coming from the transmission. I'm thinking it's possibly the transmission fan or something like that.
Anybody have this strange sound?
I asked the dealer and they gave me the classic "thats normal" routine.
Personally, it drives me crazy and I'd like to get it fixed.
I know it sounds crazy but you are missing the top bolt on your A/C pump or it's loose. Had the same problem and after a a year of troubleshooting finally found that the bolt came loose and fell out. Got a new bolt from O'Reilly's and all is silent. I have no idea why is goes away when pushing in the clutch but I had the exact same issue. All is good now.I've also been hearing it really faintly when I'm idling at a stop sign. When I have the clutch pedal in, the noise goes away. This makes me think it's something to do with the tranny. For awhile I thought it was spark knock, but I tried supreme gas and it's still there.