[Talewinds]

A fellow Pelican and I are attempting to set the baseline AFR using the "ghetto style" O2 sensor measurement of between 0.2-0.6Vdc. This morning after the car had been driven and warmed up we were getting no reliable reading from the O2 sensor's output (the male pin, not the heater pins), like when a meter is open circuited and it's bouncing around on millivolts while it's reading the atmosphere, not a tangible electrical signal.

Fast forward, later at home he connected his meter to the O2 sensor while the car was cold and after starting the car watched the O2 output go from around 0.6v and slowly sink down to 0v gradually as the car warmed up.

What's going on with this O2 sensor?