Re: ur-Q Oxygen Sensor Question

[Huw Powell <human@nh.ultranet.com>]

>    Before I went ahead and bought a new oxygen sensor for the ur-Q, I decided
>    to check
>    the voltage coming from it. No voltage until it's warmed up, of course...
>    after that, I
>    was seeing, at first, about .1v, then upto about .125v, then after the
>    radiator fan began
>    to cycle, I was getting about .25v.
> 
> Is a problem!

(pretty graph snipped)
> 
> You're running lean. Bad. Bad. Bad.

perhaps...
> 
> Outside chance your static mixture is way way lean -- this is adjusted
> via 3mm (??) hex on the top front of the fuel distributor assembly.

more likely, bad oxygen sensor I think. if the voltage was low *and* the
duty cycle was pegged by the ecu (trying to compensate for leanness) I'd
buy the lean theory but the OXS voltage is not even being accepted by
the ecu - it's running a fixed 50% DC.  Maybe not only is the OXS bad
(or the system too lean...) but also perhaps the OXS signal isn't even
getting to the ecu...

all things to check I suppose.

-- 
Huw Powell

http://www.thebook.com/human-speakers

82 Audi Coupe; 85 Coupe GT
http://www.nh.ultranet.com/~human