Re: Urq sorting out

[Huw Powell <audi@mediaone.net>]

DGraber460@aol.com wrote:
> 
> I think I am making progress.
> I had thought if I got rid of the rich condition, it would be finished. Not
> so.
> Cold start= DC of 42 climbing to 63.2 in about a minute. After 2-3 min. goes
> to stable 49.6. All is well.
> Tripping the WOT sends to 62.4, and returns to 49.6 when released. All is
> well.
> Upon driving it starts to feel sluggish, and runs random on 4 cyl. Feels like
> rich or lean condition.
> Pull in garage & hook up meter = 49.6. 

As far as I can guess, you are running open loop.  That duty cycle is
supposed to go up and down in a feedback loop around some vague center
setting.  At the same time the OXS output voltage will oscillate around
0.5 volts.  A "fixed" duty cycle means no OXS feedback in the system,
for whatever reason.

So measure the OXS voltage while it is warm and idling...

I suspect something is stopping the ECU from taking over, but as we get
more specific I'll have to defer to people who know Urq's better than
myself.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

82 Audi Coupe; 84 4kq; 85 Coupe GT; 73 F250