At 08:42 PM 9/9/2009, Rocket J Squirrel wrote:
>I have a Ken Lewis O2 meter and during the initial open-loop operation, it
>read normally, in the middle of the scale, even when running poorly.

Until the sensor heats up to ?600F? or so it won't output a signal,
and the level you see on the bar graph represents the bias placed on
the line by the ECU.  When the sensor starts working it overrides
that signal -- unlike every other sensor/sender on the engine it
actually is a specialized battery.  So until it leaves the middle for
the first time it's telling you nothing except that it's not shorted
to ground or to the heater voltage on the 2.1l etc.

Yours,
David