82 coupe heat/idle problem

[Huw Powell]

please keep this stuff "on list"... for two reasons.  One is that as
soon as it goes private, I am only "helping" one person.  On list, I
could be helping those who once helped me.  Don't want to sound
cranky...

The other is at least the list strips off the stupid html and makes it
so a message will be quoted properly when "replied" to.

Anyway...

>  on "heat" will the car run if you keep your foot on the gas pedal a
>  bit?  by "heat" do you mean anywhere in the "red" part of the scale?

Yes I can drive all day with the heat on; as soon as I push in the
clutch to come to a stop the idle drops  and
engine stalls.

>  things to check anyway: vacuum leaks (as always!), mixture settings,
>  tune up parts in general.

New vac hose yesterday; tune up stuff is new.
Mixture settings have not fooled with b/c it runs great, no smoke, and
great mileage...

OK, so what could make the car idle with "extra" air but not without it
(the extra air is not leaning it out, it gets matched with fuel)?

could be... the warm up regulator problems making it run too rich
could be... the vacuum leak you don't have

and as a long shot, why not a take a close look at your heater valve
cable and the valve - is there any chance motion or position of them
could be pushing against anything, shorting anything out, all that good
stuff?

If I were you I would take some measurements.  Get it warm, then measure
the OXS output voltage in eahc position (heat off, running, then heat on
and it stalls - anything interesting happen then?  also, heat on, kept
revving steadily by assistant or clamp on throttle linkage)

If you can, measure the frequency valve duty cycle at the "spare"
connector by the pass side strut tower, see what that is doing.

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/