What are the oxygen sensor voltages for rich/lean?

[nogard]

I don't have a air/fuel ratio gauge. I was wondering if I could connect my digital multi-meter to the oxygen sensor wires and read the voltage that is coming off of it. I'm experimenting with the AFM mod, setting the tension of the spring, the "click" mod. I would like to know were I'm at right now with the air/fuel ratio. Can someone list the different voltages for rich to lean, and if you know the voltage to ratio, example: 3 volts = 14.7 A/F, something like that.

Thanks.

[Kep]

Toysrme did a great project that you may want to review. Among other things it involved metering the O2 sensor. I’ve wanted to try it but have never taken the time…

http://www.toyotanation.com/forum/showthread.php?t=67571&highlight=oxygen+sensor

Kep

[aych]

are the diagnostics ports he mentions the ones clipped beside the air filter box?

[4g63tFTW]

The diagnostic port is the one that says diagnostic on it. It is near the airbox.