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More likely cause than a bad AFM is a bad CTS (m) (archive)
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Posted by John A on June 01, 2002 at 18:22:41:

In Reply to: Black Soot on rear bumper = bad AFM????? posted by Erik Brannfors - Seattle M3 on June 01, 2002 at 12:02:08:

Coolant temperature sensor, the blue one on the coolant pipe on the passenger side of the head. At 68 degrees F., it should have a resistance of 2200 to 2700 ohms. At operating temperature (80 degrees C.), the resistance should be 300 to 360 ohms. Also check the wires going to it for breaks.
John
88 ///M3 Cinnabar

Noticing that after a week there is a buildup of soot on the rear bumper from the exhaust. I have searched the archives and saw that some have indivated that a b ad AFM causes this. Can I adjust it? Do I pop the cover and clean the carbon off the track under the sweeping needle? Do I adjust the screw under the "tamper proof" blue plug?

Or bite the bullet and spend $1000 on a Split Second Gen 2 MAF kit!!!! Yeah......




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