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      05-14-2012, 10:17 PM   #1
wren57
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Drives: 335i
Join Date: Jul 2010
Location: St Louis

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What causes exhaust oscillation?

Lately I've noticed that my exhaust note oscillates a good deal both at idle and at a stable cruising speed. What could be the cause of this? I've recently cleaned my intake valves and replaced my spark plugs.
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