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This is why I don't like widebands...
If you read the FSM, it tells you to adjust everything possible until idle is highest.
The FSM does not mention anything about AFR's or widebands - you don't need it accord to what Mazda recommends.
A lot of things can affect wideband AFR's, and it's not going to be identical for all engines.
Most have reported that anywhere between 12.9 to 12.5 is about normal.
The engine just doesn't like idling any leaner than that - probably due to the fact that atomization is very poor at that low RPM's.
Bottom line...adjust AFR's until idle is highest; don't adjust idle trying to hit some target number.
-Ted
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