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      09-19-2013, 02:15 PM   #3
Incompatible
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Drives: 07 AW Z4C 3.0Si
Join Date: Aug 2007
Location: San Diego

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You need to get a mechanic's stethoscope and use it to localize the sound. Knowing where it's not coming from can lead you to the source. It may take a number of cold starts, but eventually you will track it down. From the sound quality and short duration could it be the air pump?
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