When the weather is warm, we rely on our car's cooling system to keep temperatures in the engine compartment under control, and keep us on the road. Your cooling system is a series of components that circulate coolant through the engine to absorb heat, then circulate air around the coolant to get it out. If any part of the system stops working, you're on the side of the road while your engine takes a steam bath.The best medicine is preventive. You should flush your radiator
on schedule to keep the system clean and well flowing. Unfortunately we aren't always lucky, and things go wrong. Let us help you figure out why your car or truck is running hot or overheating.
Problem with 2000 BMW 528i idling problem when you start the car in the winter time. The care starts by idling aroun 1000rpm, which is normal for a cold engine start, but within 30 seconds it drops down to about 750rpm. Now the problem is that it fluctuates between 750rpm and 250rpm, almost shutting down, and sometimes does shutdown.
Solutions:1. I would first try to clean out the Idle control valve...some people have seen a 30% increase on cold start idle, there are several links in the DIY section.
2. If the sounds like classic Vanos seal issues. I had the same problem with mine in the cold weather. It would go away after the car warmed up. Replaced the Vanos seals and the problem disappeared.
3. Make sure you get the correct replacement seals or you'll end up with the same problem down the road.