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I was just reading about this, so here goes.... The AAR (Aux Air Regulator) lets in more air into the intake to increase the idle speed when cold (sorta kinda like the fast idle cam on a carburetor). The electric ones are diven by a wire coming off the fuel pump circuit. It heats up an element that causes a rotary valve to close as it heats up. See here: http://www.tiserves.com/VW/technical/FI/page45.html So, armed with that information: Is the wire to the heating element getting power? If so, maybe the heating element is bad. On Tue, 15 Feb 2005 18:30:06 -0800, Toby Erkson <air_cooled_nut@pobox.com> wrote: > Okay, how does this damn thing work? > > My hoses are connected correctly. There is a red wire attached to the > bottom of it -- good, as that's what the automatic model is supposed to > have. > > I can completely close the idle bypass...nothing happens to the engine > idle. If I open up the idle bypass the rpm increase. > > If I clamp off the hose from the air cleaner to the AAD (or pull off the > hose and seal it with my thumb). The engine dies. > > This is with the engine cold as well as warmed up. What gives? How is > it supposed to work and how does one test it? I'm thinking that once > the engine is warmed up the AAD would close, no longer allowing air to pass. > > -- > Toby Erkson -- air_cooled_nut@pobox.com > Two '72 VW Squarebacks, '95 VW Jetta ~ WIP, '81 Gold Wing, '73 Porsche 914 > http://www.icbm.org/ > Portland, Oregon > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >