Hi all. Was curious about the relationahip between the AFM air bypass and AFM flap. Maybe someone else is too. http://www.race.nangreaves.com/golf/FU01/ch7.6.html From that page (Digifant II as used in other VW's but very similar to the 2.1 WBX it seems): "The idle mixture (% CO) is adjusted by turning the idle mixture screw, changing the amount of air allowed to bypass the air flow sensor flap. This changes the opening force acting on the flap, which changes the potentiometer signal to the control unit. Since the injector opening time (and therefore the amount of fuel delivered) is influenced by the potentiometer signal, the idle mixture is changed." Through my various stages of trouble shooting and learning about Digifant on the 2.1 WBX, I had figured that the air bypass, at idle, would allow the AFM to stay closed. e.g. that air bypassed this flap and that the mixture was controlled by adjustment of air only, via the CO screw. Not true it seems.
Neil.
-- Neil n 65 kb image Myford Ready For Assembly http://tinyurl.com/64sx4rp '88 Slate Blue Westy to be named. '81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/ Vanagon VAG Gas I4/VR Swap Google Group: http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines |
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