Re: WOT switch

[Gerard <gerard@poboxes.com>]

> Audi fits various emission control devices to the cars depending on the
> market they're designed for. Vehicles without oxygen sensor and
> catalytic converter are imported into countries where unleaded fuel is
> not available or where the emissions limits are liberal enough not to
> require catalytic converter. I guess that the Audi tech you spoke to
> meant that the lambda sensor was never installed on South African
> models. Importing the cars with oxygen sensor and then removing it would
> be idiotic.

These cars were imported into the country as far as I understand.
They came with all the fittings and were "modified" when they 
landed, this is what the tech told me. Last night, in an attempt to
find this lambda sensor (and being stupid enough not to know that I
needed to look for it from the bottom of the car) I went flashing
my light all over the RHS of the vehicle. The result of this
prodding around looking for something is that I will now be taking
my car in tomorrow to have the inner CV joint repacked and sealed.
While looking for a lambda sensor I happened to notice that the  boot
on the right inner CV joint has torn off and the thing looks dry.
So tomorrow my *new* mechanic will be repacking the CV joint and I
told him while he is down there could he confirm the installation
of the lambda sensor. So tomorrow I will find out if the guys as
VW/Audi SA have given me correct information.

> Besides, when the car with catalytic converter is run on
> leaded fuel, the cat soon goes south and can get clogged with deposits.

No cat as far as I can see. Someone put on a Brospeed muffler in
the middle. Audi indicate explicitly  to run the motor on 93
leaded fuel at the coast and at altitude and not to use any other
fuel. Why?

> I also don't quite understand how the fuel injection was replaced with
> the one from the non-turbo cars. All 10V turbocharged and early
> non-turbo cars, regardless of the emissions control devices installed,
> use the K-Jetronic injection system, which is purely mechanical system.
> Turbocharged cars feature computer, which controls ingition, boost and
> can also control mixture by "fooling" the fuel distributor by means of
> the frequency valve. As Phil observed, depending on the country of
> destination the ECU either monitors the oxygen sensor to estimate the
> correct mixture or uses values stored in the memory. Some early models
> did not have the frequency valve at all, so the ECU's control over
> mixture was somewhat limited.

I was told they reverted back to the normally aspirated injection
systems. How they did or whether it was done is heresay.

I can confirm the that the it runs some K-Jet injection, but as far as I
can tell from the Haynes books the turbo models run KE-Jet which 
is the one with fully electronic ignition (FEI). How to confirm this
visually? KE as far as I know is  K, but with Electronic ignition.

> Non-turbocharged K-Jetronic cars did not have any electronic control
> devices at all or, in case of US cars that required emissions control
> since early 80s, had a small electronic box that triggered the frequency
> valve depending on the signal from the oxygen sensor.
> Later non-turbo cars got the new KE-Jetronic system. It features an ECU,
> fuel metering plate potentiometer and integrated solenoid to control the
> operation of the fuel distributor, so it works more like an EFI. I doubt
> if any turbocharged Audis ever had this system installed, though.

Is this KE-III? I understand that that was the last type fitted to
those shaped motors. I don't have that at all. Mine, as far as I
can determine, is KE-Jetronic. the ECU is MAC13, at least the tag
indicates that. Don't the normal distributors have a vacuum line and
the electronic ones have a electrical connector on the side? Mine
has the electric plug connected to it. There is a frequency valve
on the throttle. I will be confirming existance of the lambda sensor.
There is no cat attached.

G.
-- 
"a thousand miles from here, there is another person smiling"
1990 Turbo (200T)
name   : gerard van vught
tel    : +27-57-912 2658 (w) / 082 923 9609 (cell)
url    : http://www.acenet.co.za/homepages/gerard/
e-mail : gerard@poboxes.com  / han.solo@galaxycorp.com
         gerard@acenet.co.za / van_vught@frg.issi.co.za