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Old 01-19-2013, 05:28 PM
HerbP HerbP is offline
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Location: Georgia
Join Date: Jul 2009
Posts: 5,113
Mein Auto: 2005 645Ci & 2007 750Li
The thermostat is a very common failure on these engines. If your engine is idling rough, you could have a vacuum leak. Check your 2 vent valve lines at the front of the valve covers for leaks. Another problem could be a loose oil filler cap, or the 2 crack case valves. You should be able to find plenty of info in the DIY section. You might want to look into buying some diagnostic tools for a BMW, generic readers are not much help on these cars.

Good Luck!
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