At 06:45 PM 7/4/2008, Gerry Lepage wrote:
>wires myself.?I got the old one out and?connected the new one up and
>bus runs like crap. Rough idling with black smoke. Same as old
>sensor. Unplug it and it runs

So...the system is getting a constant "lean" signal from the sensor
input so it's richening the mixture as much as it can.  If I recall
correctly, lean (oxygen on both sides of the cell) should give 0
volts, so I'd look for where the lead is shorted to ground or to the
heater minus lead.

>

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