5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
I've been struggling to figure out what's going on with my 2001 525i since I bought it this past March. Basically, in cold weather, the idle will dip when I'm stopped. It will drop from ~900RPM down to <500RPM, and then the car will recognize that it's about to stall and kick the idle back up to a normal level. It'll will dip back down again and the loop will continue until I start moving or the car is at a normal operating temperature. Every so often it will actually stall.
I've taken it to two mechanics and had the car tuned up back in the spring, and they don't know what's wrong. I know it only happens in cold weather because it's happening again now that the nights are dipping below 50F, but didn't do it all summer.
Does anyone have any ideas what could be causing this problem?
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