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I don't know what is causing the valves to get gummed up on the non-M's. However, you're right: The solution is to either spray the valves with carb cleaner and/or blow 'em out with compressed air. For me, the carb cleaner was sufficient to resolve the code thrown.
My wife's car didn't have any idle issues as such, although it had occasionally died on me with a quick stop. Rather, it was just the code which was the cause for my finding the DIY.
I wonder if anyone has had these valves replaced for any reason on an M?
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