At 07:57 AM 4/11/2001, Warren Chapman wrote:
>running rich when the O2 sensor is attached.   Disconnect the O2 sensor and
>it runs correctly.

It would be difficult for that to be anything but a sensor
problem.  Measure the output voltage with it connected and
disconnected.  With the sensor disconnected it should go below a half-volt
on closed-throttle deceleration, and should go above a half-volt on WOT.

>The O2 sensor is new.

And therefore immediately suspect anyway.  Maybe got poisoned with some
antiseize compound, maybe bad from the factory, maybe flaky connection?

>  The CAT seems OK.

Not relevant

>  Have swapped ECU and AFM with no
>success.

David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"