I believe I have found an alternative to an EFIE.

Correct me if I am wrong but the more volts the computer recieves from the O2 sensor the leaner the fuel mixture becomes.

I was thinking why not just have a AA battery that adds a little voltage at a time. My goal is to be able to add .1v at a time.

I believe I have got it close.

A fixed 100 ohm resister in series with a variable resister you can tune to 1400 ohms.

This is what if found as the potentiometer http://potentiometer.com/MW10.cfm?se...08091612385762