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OK and Great. Thanks for the feedback Paul and Tony (as well as your kind offer).
Things are starting to make more sense to me now as little by little, both the lambda cis and this digital wurs operation is better understood.
Last night, I installed the new 02 sensor (old one was completely covered with a hard black surface) and tested things again.
This time, I was able to get a signal from the sensor lead while warm, and it was around .85 volts when engine was fully warm and at idle. At this time, the control pressure was steady at 2.9 bar. The FV still runs at 50% duty cycle in open loop, but when the sensor lead is reconnected with a warm motor, it is now around 88%.
Seems odd ? if I understand things right, the 02 sensor is indicating a rich mixture, the control pressure is producing a rich mixture, but the FV duty cycle is responding in a way that would indicate it thinks the mixture is too LEAN ?
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