O2 sensor Voltage

[mike mager]

"Steve Leonard" <gsxr1300 at hotmail.com> asked:

>  I need to alter the voltage signal coming from a O2 sensor. I want
to fool the ECU into a leaner condition.
>  I am going to school, driving 110mi round trip. I want to see how
much fuel mileage I can sqeeze out of my Geo Metro. Where can I get plans 
for a simple voltage "stepper".

Uh, what's a 'Voltage "stepper"'?

A simple single-supply operational amplifier could add an offset Voltage to 
the EGO Voltage, or could effect the EGO Voltage by a ratio.  "How lean can 
you go", we wonder?

Mike
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