CGT / 4000 questions

[Huw Powell]

Did someone call?

(1) Your car should have the 2144 cc engine with CIS (identifiable by 
the black fuel distributor head).

No one, not even VAG, understands the cold start system on that car 
completely.

First, cold starting an ICE requires two things - more fuel and more air.

The air is handled by the auxiliary air valve on the back of the head. 
It is heated by the head and electrically, which closes off the extra 
air as the engine warms up.  Or if you leave the key "on" for too long.

As far as fuel, there are basically two things going on.

One is the warm up regulator (WUR), a/k/a control pressure regulator, 
and the other is the cold start valve.

The WUR is on the driver side of the engine and has two fuel lines, two 
vacuum lines, and an electrical connector.

The electrical connector is a heater, it is in parallel with the aux air 
valve heater, and is always on with ignition.

The fuel lines allow it to use gasoline as a hydraulic fluid to adjust 
the control pressure at the fuel dist.

The fuel is probably stale and gone bad, and the WUR is probably clogged 
also.  Remove, clean, flush, etc.

I forget what the vacuum lines do but go here:

http://audi.humanspeakers.com/vacuum-system.htm

To properly troubleshoot a clean system you need to hook up pressure 
gauges to the fuel lines in various places.

The cold start valve, or 6th injector, is actuated by that thermo switch 
and some pretty iffy electronics.  It's supposed to spray for a few 
seconds depending on temperature.  The graph is in the manual. (I think 
it always gets 12v and the ground is switched, should be obvious from 
the manual.)

It is also used for hot starting using the orange hot start pulse relay.

This is mostly for the CIS-E system, but read it anyway:

http://audi.humanspeakers.com/tuning-cise.htm

(2) Speedo cable - yes, at least there was:

http://audi.humanspeakers.com/oxstimer.htm

I'll sell you the one out of my '82 if you can't get it new.

I'll sell you lots of other cool stuff too, if you want.

(3) Side trim, good luck.  I don't think they sell it, and you can't get 
it off a car to re-use because it will get bent.

- Huw

On 12/3/2015 1:11 PM, Woodland, Mark wrote:
> Greetings folks,
> I'm troubleshooting an '83 CGT 5 cyl /5-speed cold start circuit.
> Per the Bentley, the Coolant Temp switch "seems" to check out on the back of the head (35 Ohms vs 60).
> I have continuity on the ground circuit, but the "hot" wire shared with the ignition / starter circuit is not hot, but the starter is.
>
> Bentley schematic says they circuits are connected "behind the dash" at Terminal T4.
>
> 1. Anyone have any idea where this "T4" terminal is? The 4000 schematic shows the same terminal and circuit, if that helps.
>
> Also, the speedo cable(s) and intermediate O2 sensor mileage recording "box" w/reset button is toast.. all rusted up.
>
> 2. Does anyone know if there is a single cable replacement that bypasses the mileage box and goes straight from the transmission to the speedo?
> I would think that earlier Foxes / Quantums / Dashers might have a one piece cable.
>
> 3. Looking for CGT side trim, both sides, if anyone has any to spare.
>
> Many thanks in advance,
> Mark
>
>
>
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