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M3 Frequently Asked Questions First place to check if you've got a question about your BMW M3. UNDER CONSTRUCTION


 
 
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Old Fri, Oct-31-2003, 05:06:39 PM   #11
95RogueM3
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hfm= hot film meter, frequently referred to as air flow meter.

This is the peice which meters the air going into the engine and then compensates with the correct amount of gasoline to keep the stochiometric ratio.

-Richard
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