O2 Sensor Open/Close Loop

[tom cloud]

>My ECM is in closed loop mode at idle and part throttle. At wide open
>throttle is goes into open loop mode ( it stops reading the O2 sensor ). 
>
>WHY?
>
>Is the sensor not accurate after a certain exhaust gas velocity has been
>reached? Can the ECM not react fast enough at the high RPMs? Help!
>
>
>Mark Mason.

That's SOP (standard operating procedure).


Tom Cloud <cloud at peaches.ph.utexas.edu>