re. 1982 Coupe:Hot Start Issues

[Huw Powell]

Ben Swann wrote:

> A mixup in terms I suppose.  As long as I can recall, back to the days of
> the Dasher and Rabbit, the terms Control Pressure Regulator and Warmup
> regulator have been used somewhat interchangeably, as the warmup regulator
> adjusts control pressure based on warmup/engine temp.  I think the term
> Warmup Regulator comes from the thermo switch that provides additional
> vaccum on warmup(or is it the other way around) to provide for reduced
> control pressure during the first few minutes of engine running.   Also
> doesn't it have vacuum ports for control pressure regulation based on
> manifold preesure(vacuum) as well?
> 
> Anyway WUR is what I am referring to.

Yeah, terminology is a bear.  You learn a word one place, it's used 
differently somewhere else, things have more than one official name... 
anyway, it's more my fault than yours, since whatever we are going to 
call the WUR (a term I learned from the shop next door), it certainly 
does regulate the control pressure!  Of course, the only thing it really 
does that for is to handle cold start enrichment (and on some, cold/WOT 
extra-enrichment via a couple of vacuum ports).

On CIS, the frequency valve acts more like the electromechanical control 
pressure actuator (a name for it I picked up from a guy next door who 
knows more about these things than all of us put together...) when the 
car is in closed loop - fine tuing the mixture in response to the OXS. 
Which, of course, should be called the Lambda Sensor and nothing else...

Ti Kan wrote:

> The official Bosch terminology for the "warm-up regulator" is actually
> the Control Pressure Regulator, used on CIS and CIS-lambda cars
> (circa 1975-83, and also on Audi CIS turbo models).  This is the device
> that's mounted on the engine block with two fuel lines going to it from
> the fuel distributor.  It is bi-metallic controlled and electrically
> heated.  Sometimes it also has one or two vacuum ports.
> 
> The CIS-E (circa 1984-91 non-turbo) and device on the fuel distributor
> is called Differential Pressure Regulator according to Bosch.  This has
> been called "control pressure actuator" on this list in the past, causing
> confusion.
 >
> The other device to increase idle for cold engine is called the Auxiliary
> Air Regulator according to Bosch.  This is a also bi-metallic and
> electrically heated device, but is used to bypass air around the throttle
> body.
 >
> Hope this clears the terminology up.  I call for everyone to use the
> Bosch way of calling these things to eliminate any future confusion.

If only we all knew what Bosch called everything, and every book and pro 
followed the same rules, life would be easier.

Just out of curiosity, I dug into the good ole family album to see what 
*Audi* calls a few of these parts:

the auxiliary air valve = "idle air control"
warm up regulator = "warm up valve"
cold start valve, at least, seems to always have the same name!
I couldn't even *find* a frequency valve to see what they call it.
and the CISE control pressure actuator... = "pressure regulator"

I'm not quite bored enough to go find out what my Bentleys call all 
these things.

Bottom line?  Always best to describe a part a little, as to position 
and connections, supplementing with a photo on the www somewhere if 
necessary.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/