O2 sensor Voltage

[nacelp]

Might not be anywhere near that easy depending on your ecm.  Have you read
about any of the ecm strategies for monitoring O2 v, and corrections?.
Some expect a specific response, and time delay from the O2 to changes in
injector timing.
Grumpy



>     I'm working on a similar project, only I want to be able to fool the
O2
> sensor in either direction (rich or lean).  I'll be using a microprocessor
> to control the O2 sensor line to the ECU, and I'd like to be able to set
the
> conditions for rich, lean, and optimal mixture.  In my case, the ECU
really
> only pays attention to the O2 sensor signal from idle to about 3000 RPM,
> depending on the throttle position.  I want to be able to fool the ECU
into
> thinking that the mixture is optimal during these conditions while I mess
> around with the pulse width being delivered to the injectors.  My first
idea
> is to use an A/D to monitor the input voltage, modify it to optimal, and
> then a D/A to tell the ECU not to change the fuel.  Any other ideas or
extra
> input would be appreciated.
>
>  Chad
>
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