W-A-A-A-A-Y-Y-Y  off any gun-related topic, but does anyone happen to know what kind of voltages a "typical" oxygen sensor is supposed to produce (under both lean and rich conditions)? The vehicle I'm trouble-shooting uses the unheated variety, mounted in the exhaust manifold.

Don't have a scan tool, and this vehicle is too old to provide much in the way of diagnostics anyway (carbureted 1988 Mitsubishi 2.6L four-cylinder).

I may be wrong, but was under the impression that many (but not all) O2 sensors produce similar voltages under similar conditions. For example, Edelbrock, MSD and Holley all sell aftermarket lean/rich indicators that can be used with the vehicle's existing O2 sensor. That would seem to imply some commonality among them.

According to GM specs:

Sensor voltage at operating temperature (392 degrees F, 200 degrees C)
Lean 200mv. (.2vdc)
Rich 800mv. (.8vdc)

Below operating temperature, the voltage drops rapidly out of this range and responds more slowly to oxygen changes.

SWS, you the man.

Much thanks, [b]SWS[/b] - You are indeed Da Man!