Quote:
Originally Posted by CarAbuser
Open loop at WOT?? The only time the DME is open loop is when there is a O2 sensor fault or at startup.
He's also not having the surging issue at WOT, because diagnostic routines are mostly disabled at high DME CPU load.
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Yes, at WOT, the DME is ignoring the secondary narrow band sensors. These are only used for emission compliance to reach stoic under low throttle. Primary wide band sensors are used to target rich fuel mixtures.