I am pretty sure closed loop is anytime the pcm is fueling off of the O2 sensor. Becuase if you look at closed loop afr it is 14.7. So I believe Sabrewings is correct.

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)