O2 sensors at WOT?

[Mark Wilcutts]

Question: if the ECM ignores the O2 sensor, in what sense do you mean it
stays in closed loop? How can it have added to the block learns if it's
ignoring the sensor?

On Tue, 3 Nov 1998, Mark Romans wrote:

> The engine actually stays in closed loop at WOT,  it just won't learn and
> ignores the 02 sensor and goes to a richer "Commanded" air fuel ratio.  Per
> PP Fenske,  it the engine has learned to add more fuel via block learn and
> integrator it will add these same amounts at wot,  however if it is pulling
> fuel out, it will go to 128.  If you have diacom it shows what the commanded