Does the AFM do anything at idle?  In other words, does the spring tension
affect the idle mixture at all or is it strictly set by the mixture screw?
I am trying to tune with the new HP Digijet ECU  in my otherwise stock 1.9l
Boston Bob engine.  I have tightened the spring tension 4 notches in an
attempt to regain some of the lost mpg.  I put a Voltmeter on the O2 sensor
and roughly set the mixture by the voltage.  The idle mixture seems to run
leaner with the O2 sensor disconnected.  I would have guessed the other way
around, hence my question about the AFM's role at idle speed.  Maybe it
moves a little at idle?
The new ECU really makes a big difference.  I would highly recommend it.
Seat of pants feels like 10 hp, at least as good as a stock 2.1l.

                                                            Jay

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