Q: Rough idle in cold weather.
Vehicle idles rough when I start it up in cold weather.
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Rough Idle could be caused by many things and is hard to diagnose. BMW have a known issue with the vanos solenoid that causes this problem. I would have the car checked for codes and have a technician troubleshoot the rough idle problem. It could also be a bad coil pack as well as a number of other things.
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