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Secondary 02S stoichiometric at same O2 amount as primary?
In reading about air/fuel gauges, a thought occured to me.
From what I've read, most oxygen sensors have an abrupt change in voltage when they cross the threshold for proper air:fuel mixture to achieve lowest emissions or best mileage (not sure which). Their operation at any other mixture, or O2 content, is not very predictable, so they don't make good tuning tools.
If the primary O2 sensor threshold is, say, 13:1, wouldn't the secondary sensor's threshold have to be set at a lower O2 content? Since the catalytic converter oxydizes (burns) chemicals in the exhaust, there will be less O2 in the exhaust after the converter; and for the ECU to read it, the threshold would need to be for lower O2 content.
So, I was thinking the secondary sensor would have a lower air:fuel threshold than the primary, and could possibly be close enough to 10:1 that it could be used as a tuning tool.
Anyone know the threshold of the secondary O2 sensor? Is there any chance it's near the right level?
I'm know this is unlikely, or someone else would be doing it already.
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Jason, 98 automatic, large transmission cooler.
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Linear Mode
