Ur-q duty cycle wrong.

[Martin Pajak <quattro@rogerswave.ca>]

Q-list,

Finally the Frequancy valve is working.
I was given a properly working computer to try and see if the frequancy
valve would work.
It does.
However there is a problem with the duty cycle.
When the car is first started the duty is ~50% and moves up or down.
Sometimes it actually goes down to about 37%.
The closing of full throttle valve causes the duty to go to 77%.
And yes the idle switch is working fine and the wire to the ECU is fine
and the ground for the switch is also fine.
Once the engine gets a bit of a temp into it, the duty cycle shoots up
to 96% and stays there unless I close the full throttle switch at which
time it goes back to 77%.
I tried to adjust the CO from all the way rich to all the way lean
(untill the engine stalls).
No change in duty reading.
Also unplugging the Oxygen sensor makes no difference, the wire is fine.

I know that the air temp sensor gives reading of 2400 Ohms rather than
13 Ohms at room temp, but it should only affect ignition timing and
boost cut-off.
I checked all the wires for continuity and they are fine.
The fuel pump relay I am using is has the right part number except for
the letter which is G and it's supposed to be F.
I can't see from the wiring diagrams how this would make any
difference.  The fuel pump works fine.
I am stuck.  Any hints would be greatly appriciated.

TIA

--
Martin Pajak

http://www.geocities.com/MotorCity/5939

1982 Audi Coupe Turbo (475,000 km)
1982 Audi Coupe Quattro (155,000 km) Coupe with 4kq floor
1983 Audi Ur-quattro (220,000 km)
1986 Audi 4000 S Quattro (360,000 km) with 5 bolt pattern

C.E.O. of examlastminuteallnighterrollthedice inc.