Quote:
Originally posted by Bluv69k
 anybody?
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Closed loop is a mode that the ECU goes in to when at idle, partial throttle and at cruising speeds.
In this mode, it uses the O2 sensors to maintain a A/F ratio of 14.7:1 (Stoich), which is the chemically correct mixture for the lowest emissions and fuel economy.
If you have the setting to far off, the ECU can't achieve closed loop.
At WOT, the ECU comes out of closed loop, disregards the O2's completley, and uses the MAF to regulate fuel. THat is why it's so important to have the WOT A/F setting correct.
In closed loop, the ECU is very adaptable, and it has a big range it can work within...