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OK I understand a little more know, I have never driven a car with lean burn before.
On a traditional FE car, the computer holds the A/F ratio at 14.7:1 (closed loop) up to a certain throttle opening, after this point the computer goes into open loop and disregards the O2 sensor. When in closed loop it maintains the 14.7:1 by alternating rich/lean, not by actually measuring 14.7:1.
There may not be a closed loop in the traditional sence for your car. I would try to record some data on A/F ratio vs throttle opening and post it here and seek some opinion. My previous post would apply more to a non lean burn car, I would need to see more info to provide any meaningful advice to your situation.
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