Philip, Since you mentioned the "fun" VW bulletin, here it is for those who have not yet had the pleasure of reading it. (Actually this discussion started with the possiblity of clogged fuel injectors causing similar symptoms as the infamous afm-induced vanagon syndrome. I still think my injectors are clogged. Today I dropped the injectors off for ultrasound cleaning, only $30 apiece, cheap insurance). For those who suspect their afm has harmonic vibrations, read on: Technical Bulletin Group: 24 Number: 92-01 Date: February 29, 1992 Subject: Vanagon Intermittent Misfire Model(s): All Vanagon Digifant Fuel Injection Engines CONDITION After driving for 1/2 to 2 hours at a constant speed, vehicle experiences lack of power, cuts-out or stalls, often accompanied by bucking or jerking of the vehicle. In ALL cases, the vehicle will restart immediately. This symptom may not re-occur for several weeks/months. Inspection by the dealer results in nothing conclusive. Some air-flow meters may experience a vibration resonance of the metering potentiometer wiper during extended constant driving. This resonance causes the air-flow meter to supply an intermittent signal to the Digifant ECU. The ECU will then default to a "no-load" condition and reduce the injection time.
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