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Old 11-24-2013, 01:19 AM   #3
JohnnyK
1st Gear Newbie
 
Join Date: Nov 2013
Location: Toronto
Posts: 10
I feel compelled to chime in as I hunt for seats.

The mileage gauge SHOULD read 0mpg when you're not moving. No codes? Vacuum leak would probably cause a funky idle.

ANd I'm not sure about your BMW's specifically, but it's probably a combination of vacuum and VSS that controls that (Just a guess). When vacuum is high and VSS is reading 0, it knows you're at 0 mph, and mileage should read 0. What IS your vacuum at idle?
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