[T3] 72 VW Fastback idlle

Dennis Stiefel dlstiefel at dekalbk12.org
Thu May 21 16:50:44 PDT 2015

Yes as I understand it the idle screw works like a manual version of the air idle control valve that you see on modern FI systems. You just manually adjusting the amount of air bypassing the throttle plate instead of the computer doing it for you all the time. 
Ive been suspecting that I didn't get all the trash out the first time I done it. 

Sent from my iPhone

> On May 21, 2015, at 8:46 AM, Dave Pallo <rdavid at rochester.rr.com> wrote:
> Hi Dennis. I agree with Jim on his advice to clean out the air passage on
> your idle speed screw. Our FI idle speed screw is not like most other cars
> where the screw is a mechanical stop for the throttle plate to rest on. With
> our FI system - this idle speed screw is an air bleed screw, where adjusting
> the screw allows more or less air into the IAD, therefore raising or
> lowering the idle speed.  (Our '72 throttle plates are supposed to be closed
> fully at idle.) On my '72; if I back off the idle speed screw - I can raise
> the idle to a very high rpm. To see your screw so far out tells me your air
> passage is quite blocked. Keep in mind that with our 72's - you MUST have
> the 72 dizzy with dual vacuum can properly installed and functioning in
> order to achieve correct idle.  If you do not have the correct and
> functioning '72 dizzy; your idle speed will be a compromise of engine timing
> in order to achieve a correct idle speed.
> I also agree with Jim on removing the dashpot. A not needed item ;-)
> Dave Pallo
> '72 Square ~ Elwood
> Fairport, NY
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