From: "Geza Polony" <gezapolony@SBCGLOBAL.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, June 20, 2007 11:24 AM
Subject: Re: Aux Air Valve becoming available as reman

> Question: am I right in thinking that the way these things work is by
> supplying a tiny bit more air to the throttle body and thus "fooling" the
> ECU into "thinking" that the engine is running faster and thus supplying
> more fuel? If not, how do these things work?

No, there's no "fooling" involved; the engine *is* running faster.  The
intake for the aux air regulator is *after* the AFM, therefore the air being
introduced is metered air.  The effect is the same as if you very slightly
press down on the gas pedal, in turn holding open the throttle butterfly
very slightly, and increasing engine revs.   When the aux air regulator
closes it's as if you lifted your foot from the gas pedal, reducing engine
revs.

Tom Young