Re: Ur-q duty cycle still wrong?

[Martin Pajak <quattro@rogerswave.ca>]

Huw,

I performed another test. Cold running enrichment.
Book sais to unplug Ox sensor, unplug the coolant temp sensor.
Duty cycle should go to 95% but only for max of 30 seconds.
It stays there wether the wires are unpluged or pluged for more than 2 minutes
(than I would shut the engine off).

I have no clue.  I will change the ox sensor tomorrow but I doubt it will fix
anything since unpluging it has no effect.
The wires to both coolant temp and oxyg sensor read 0 Ohms of resistance between
the ECU and the connector.

Thanks

Huw Powell wrote:

> > when I unplug the Oxygen sensor the duty cycle stays at around 96%.
> > What would the computer defoult to (what %) when the Oxygen sensor
> > resistance is at infinity?
>
> The OXS isn't a resistance, it generates voltage.  Duty cycle "outside"
> the OXS operating params should be a default of 50% though.
>
> > If in fact it is 96% than I am sure the problem is the oxygen sensor.
> > I have already ordered one.  They are only $40 CDN (from a Bosch dealer) so
> > nothing much to loose.
>
> that's what I'd been thinking... if all the connections are good, the FV
> is working, etc., it sounded like a bad OXS (or bad wire to it?)
>
> --
> Huw Powell
>
> http://www.thebook.com/human-speakers
>
> 82 Audi Coupe; 85 Coupe GT
> http://www.nh.ultranet.com/~human



--
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.