Darrell:

It seems to me your basic mixture is set too rich; you should be
observing the fluctuation around .5 volts with a hot, disconnected O2 sensor.

On Sat, 27 Jun 1998, Darrell Boehler wrote:

> [snip]
> After  1 minute the voltage climbs to  to 0.9 volts and stays there.
> The oxygen sensor is getting a pretty rich reading in default mode, my van
> seems to run ok in this mode but mileage would not as  good as normal.
>     With the van still running  if I plug the oxygen sensor  connector back
> together the voltage reading will stay at the 0.9 volt level  for 30 seconds
> . Then the digifant has discerned the oxygen sensor is working and has is
> detecting a rich mixture and by 35 seconds my digifant  has the oxygen
> sensor voltage readings bouncing above and below the 0.5 volt range. 0.5
> volts reading indicates a perfect mixture.  The bouncing of the oxygen
> sensor voltage  above and below  0.5 volts is the way all ECU's seem to
> operate.

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Tom Young               young@sherlock.SIMS.Berkeley.EDU
Lafayette, CA  94549    '81 Vanagon
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