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      07-02-2009, 01:37 PM   #16
Wires
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Drives: 335xi
Join Date: Apr 2008
Location: Calgary

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I believe it's normal. At idle, they lean out the engine for maximum efficiency. During that time, power output is lower, and the engine is less forgiving to changes in engine load (aka A/C compressor suddenly snapping on).

My GM vehicles do the same.