From: Jay Kempf [jkempf@tds.net]
Sent: Saturday, June 01, 2002 1:16 PM
To: 928
Subject: [928] RE: Aux Air Reg

> -----Original Message-----
> From: Glen Larson [mailto:bigdadglen@earthlink.net]
>
> To get at a bad-looking hose (where do I stop?), I took the Extra Air
> Valve (Auxiliary Air Regulator) off of my '80 S (CIS). I'm having a
> drivability problem with stumbling on acceleration so thought to take a
> look.
>
> What should the position of the plate be when disconnected? The valve is
> mostly closed with the notch and part of the bigger hole visible. Should
> it be fully closed? Is there a test for this thing?
>
> Thanks,
>
> Glen


Yup,

Don't laugh. The test is to throw the unit in the freezer. Leave it in there
for an hour or so. It should completely open. Or if you try to put a
standard phillips #2 through it it should go through all the way out the
back. If you would like to try this one the car I would think a nice bag of
ice on top of the area would be a good simulation. Then just throw the bag
of ice in your cooler and off you go. This device as far as I can tell isn't
servicable when it gets screwed up unlike the other bits in the system.

Test for the other end of the adjustment is fully closed on a fully warmed
up engine. Off the car suspending it over some steam (steam basket of your
favorite pasta pot) would be a good approximation. I belive the device is
designed for these two extremes open at freezing, closed at boiling. More or
less doesn't open it more or less. There is a part of the arc that opens it
about half in between the extremes so that might be what you are seeing. It
might be stuck halfway meaning a broken or screwed up bimetallic element
which is the most common failure. Functioning properly it holds the idle up
about 2-300rpm and slowly and smoothly settles the idle down as it closes.
If the engine is warm it should be closed just from heat. Blipping the
throttle will not pull it off like on some other carburated setups. Actually
a pretty nice design when working right. Nothing to hang up like alot of cam
type things I have seen. When open it is just a controlled leak past the
throttle body.

Jay K.