CIS help?

[Konstantine Bogach]

Thank you Huw for soothing info.  New OXS is in the mail though :)  It will
wait year or two.

Konstantin.

Huw Powell wrote:

> > Having problem with CIS I followd Orin's advise and tried to adjust
> > air/fuel mixture so the measured OXS output voltage, while it is
> > disconnected from ECU, is ~0.5V.  I could not do it.  Voltage jumping
> > all over the place. I can get to the point - makig it richer - where
> > voltage stay stable at ~.87V.  Slowly making it  leaner gradualy(but
> > very small change in the screw position) reaches ~.75V and then goes
> > to the state where voltage randomly jumps betwee 0.004V to .9V.
> > Going far to lean makes voltage stay at ~.001V.
>
> that "hovering" point where it keeps flipping back and forth is the
> closest you are going to get.  Leave it there.
>
> > Does OXS voltage should stay more less at same level in whole voltage
> > range while signal wire is disconnected from ECU? I think it should.
>
> It won't.  The OXS is too sensitive for that, the tiniest bit richer or
> leaner will peg it one way or the other.  In actual operation it never
> sits in the middle, it swings back and forth over its middle range while
> the ECU constantly adjusts mixture to keep it there - very close to stoich.
>
> With the OXS disconnected, even at the "perfect" adjustment point, I
> would the exhaust is probably still slightly inconsistent from moment to
> moment, resulting in the random jumping you see when you are that close.
>
> --
> Huw Powell
>
> http://www.humanspeakers.com/audi
>
> http://www.humanthoughts.org/