x5 made a sharp noise upon starting

[msammy]

Originally Posted by Blue Mountain Raider

man so i left the x (2003 3.0i) outside last night (bad move) and it was like -20c anyways in the morning when i started the car i heard a sharp noise that came from somewhere under the hood. the noise lasted a split second.

has this happened to anyone else? or what could it possibily be? the car drives fine but im kinda worried about the noise. plus this has never happened b4.

Same thing happend to me twice in the last week when temps were below 18F. The sound really sounds like you've kept the key turned for too long when starting, kinda metallic, and it starts and runs just fine. It's gotta be the belt slipping slightly - it does not do this when I start it when after staying in my garage overnight (at 50F).

[crosvs]

like a high pitched whine with a little hint of metal to metal

yeah i definitely hear the same thing sometimes on cold morning, only for a split second or so, that's a good way of describing it