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Jim, Interesting observation made tonight: " yes, i forgot this one. i always had the same issue until I replced the air intake sensor, now it starts great, even when cold. my AAR was not even hooked up, so it seems that the air intake sensor affected cold idle much more than the the AAR." So I disconnected the electrical connection to the temp sensor, then removed the AAR just to clean things up and see how it works. Neat little peice of gear - but here is what I observed. When removing the air hose that leads to the intake - rpms go up due to pulling in more air - exactly as you described the AAR would do. MY ASSUMPTION: The AAR is spring loaded valve that should be adjusted to open and allow more air when cold - right? - this would raise the RPM until the hot oil warms the spring and closes the air valve - lowering the RPM to normal My valve was pretty dirty so I washed it out real well...but it does not appear to be adjust correctly. I noticed a + and - sign on the bottom near the heat activated spring. I could use some advice as to how this thing should be set when cold so it behaves correctly. Looks like the screw at the bottom lets you adjust the spring to load it for tension when cold - and heat expansion would close it. How to do this? Is this worth the effort or is it possible that like yours - the air intake sensor replace will fix some of this and the AAR does little? I checked my brain - bunch of numbers followed by B. Thanks in advance, Paulie > On 26 Apr 2004 at 16:34, Gamboa, Gary wrote: > > > > intake air temp sensors > > > > yes, i forgot this one. i always had the same issue until I replced > > the air intake sensor, now it starts great, even when cold. my AAR > > was not even hooked up, so it seems that the air intake sensor affected > > cold idle much more than the AAR. > > The temp sensors control the richness. The AAR only controls the idle speed. > > -- > ******************************* > Jim Adney, jadney@vwtype3.org > Madison, Wisconsin, USA > ******************************* > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org >