weird o2 sensor readings? (mc'd urq)

[Michael S. Williams]

hey all... so, i made a little jumper thing that allowed me to
connect my multimeter up to the signal wire for the o2 sensor...
basically, i just used a long bit of wire and combined it with a
short bit of wire into a spade terminal on one side... then, the
other end of the short wire continues the line from the o2 sensor,
and the long one goes into the cabin and is the one that i hook the
multimeter up to...  i connected it at the factory spade terminal,
cause it seemed easiest and the least intrusiveto the system...

so, apparently the sunpro multimeteri have fits perfectly behind the
shiftboot andwill stay in place while driving.  i used an alligator
clip to hold its ground (i used one of the grounds on the chassis
under the driver's kick panel... that circular thing w/ lots of
ground terminals), and then had the other lead connected to the wire
i ran in from the engine bay....

so, here's where the weirdness started... the display was showing
about .400-.600v at idle, and would drop quickly under load, to
almost zero....  so, i pulled over and turned the mixture screw about
1/2 turn clockwise (i know that's alot)... enough to cause the
frequency valve to shut off at idle... got back in the car, and at
idle, itwas reading about .800-.900v... ok... SEEMS closer... but
assoon as i got on the gas, it would drop...

but here's the strange thing.  the car had a LOT more power, and the
reading dropped BELOW 0v, into 'negative' voltage, about -.02 or
so....  and finally, when i turned off the car, the voltage reading
stayed there, and was around .550v

but, like i said, the power is closer to where it is supposed to be,
it isnt using coolant, the compression is almost exactly the same
across all 5 cylinders, the o2 sensor is brand new, the idle/wot
switch is new, the temp sender for the isv is new, the michelin man
hose is new, i checked and rechecked the intake hosing, inspected the
vacuum lines.....nothing....

the one thing i dont have on hand is a fuel pressure gauge, but im
gonna order one, since it seems like it's a good idea to have anyway,
esp w/ the cis....

anyone have any thoughts?
--
MswmSwmsW

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