Larry;
        I beg to differ. Your method would not work at all because the O2
closed loop is a dynamic system. The duty cycle of rich-lean transition
varies due to changes in RPMs and different engine load. Besides, a
continuous input would cause the ECU to default into limp mode ignoring
any O2 data.
        I linear opamp's output should follow the O2's output precisely
but at a scaled version. Intuitively this idea seems to simple to be
flawless and I would like to hear any counter points.

Drive Safely & Good Luck
Ken Lewis<Kernersville,NC>86 VW crewcab;60 356B Coupe
For Sale: 61 AustinHealey Sprite(not Bugeye);Daily driver $2500

On Sat, 15 Jan 2000 09:42:09 -0500 Lawrence Johnson
<larry_avery.johnson@sympatico.ca> writes:
>Kenneth,
>You could disconnect the OXS and plug in a potentiometer with an AA
>battery.
>By varying the potentiometer, you vary the voltage between 0 & 1 volt.
>This
>way you could lie to the ECU telling it that the engine is running too
>lean
>(near 0 volts) or too rich (near 1 volt). Automatically, the ECU would
>vary
>the FI cycle to enrich or lean respectively. You could connect the OXS
>to a
>voltmeter and read how rich or lean the engine is really running.
>It ain't elegant but its cheap.
>-Larry
>PS. This would not be kind to your Catalytic Converter
>

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