Re: WOT switch

[Gerard <gerard@poboxes.com>]

> I don't know if there are any differences between US 5KTs and South
> African 200s, but on my car the lambda sensor is located on the top of
> the downpipe right after the turbo and is easily visible looking from
> above.

Looked and looked, but nothing plugged into the down pipe after the
turbo. I assume we're looking at the point right after the point
where the corrugated downpipe from the wastegate meets the other pipe
coming from the turbo. Will see tomorrow if there is anything plugged
in along the exhaust lines when I take the car in for a CV service.

> So what's the point of fitting a lambda sesor into the car with no
> catalytic converter, except if both the lambda sensor and the cat were
> removed, but then again, what's the point in importing car with
> _expensive_ catalytic converter just to throw it out?

Beats me. There is no cat on this thing. Only 2 silencer boxes.

> That's not true. All Bosch injection systems except Motronic are
> independent from the ignition system. All Turbo models use K-Jetronic
> injection and fully electronic ignition system controlled by Hitachi
> made computer. The computer that controls the ignition also controls the
> boost level and is responsible for fine adjustment of the mixture. This
> is done, however, by an external device called "frequency valve" that
> alters the control pressure of the injection system. The frequency
> valve, ingition computer etc. are not parts of K-Jetronic system, but
> add-on devices that can alter it's operation.
> The KE-Jetronic system is a system derived from the mechanical
> K-Jetronic system, but already designed by Bosch to be electronically
> controlled. It incorporates an air metering plate position sensor, an
> ECU and a solenoid built into the fuel distributor, which acts in a way
> similar to the frequency valve. It can probably be identified by a
> number of wires connected to the metering unit, but wait until tomorrow
> so I'll check it in books. KE-Jetronic system is still independent from
> the ignition system, though.

Ok, sorry, my mistake. It definitely is a mechanical K-Jetronic, but
with electronic ignition. I know the KE-Jetronic came in the later
Audi cars when they also reshaped the intake manifold (which actually
looks  better than the one in the older models :)). That was a
almost EFI system and was on the NA motors. Those never came out as
turbo as far as I can tell. That was just before the shape changed
to the A6.

> The KE-Jetronic (official Bosch name) system is sometimes referenced as
> CIS-IIIE or something like that in English language literature. This was
> fitted to the NF normally aspirated engines. To the best of my knowledge
> it wasn't fitted to any turbocharged engines.

:)

> You are right, but as I already said, the ignition system is independent
> from the injection system (and the computer is made by Hitachi <grin>)

Yup. I understand completely now. A while back I pulled the carpeting
of the passenger side to see what ECU I was running. It is definitely
the MAC-13 Hitachi unit.

> The frequency valve is not on the throttle. It is located behind the
> fuel distributor (easier heard (buzzes) than seen).

Green plug? If it is a green plug, then the one I'm looking at is
on the front side of my fuel distributor. Buzzes like mad, actually
had me scared when I first popped the hood on this thing having
never seen them.

Thanks for the help. So this is what it's looking like right now:

	MAC-13 ECU
	Cannot see lambda sensor
	No cat
	K-Jetronic with electronic ignition

So if the lambda was pulled off this thing I should be able to confirm
it with an error code from the ECU which I can setup by putting a fuse
into the plug on top of the fuel pump relay.

If there is no lambda attached to the ECU then can it automatically
compensate for a missing sensor or did it need to be reprogrammed
to take it into account? I assume it would normally compensate without
adverse affects for the case where a lambda sensor might go faulty
on a "normal" 200T system. Am I right in thinking this way? If I am
then VW/Audi SA knew this and it would be okay for them to simply
have pulled it off.

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