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O2 Sensor Voltage

Old Feb 13, 2007 | 12:05 AM
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Default O2 Sensor Voltage & AFR

What would be the normal parameters for O2 sensor voltage readings at sustained WOT (as in a track pass) on a basically stock motor, indicating a healthy AFR?

Last edited by RevGTO; Feb 13, 2007 at 07:33 AM.
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Old Feb 13, 2007 | 09:55 PM
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Between .8 to .9 volts.
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Old Feb 13, 2007 | 09:59 PM
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Is the lower number richer or leaner?
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Old Feb 13, 2007 | 10:15 PM
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Originally Posted by RevGTO
Is the lower number richer or leaner?
Lower voltage is lean, higher voltage is rich.
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Old Feb 14, 2007 | 04:53 PM
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I have tried this and find that it is VERY unreliable. The O2's are good around stoich (14.7) and nowhere else.

At WOT you should have afr in the 12.5-13.0 range and that is WAY out of the range that narrow band (stock) O2 sensors can measure.

Doing with anything but a wideband will give inaccurate results.
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Old Feb 14, 2007 | 05:35 PM
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LINK
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Old Feb 14, 2007 | 05:56 PM
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Originally Posted by DrkPhx
Originally Posted by RevGTO
Is the lower number richer or leaner?
Lower voltage is lean, higher voltage is rich.
Actually all it really means is that the fueling is richer then Stoich (14.63), nothing more nothing less. I have seen O2 mV readings range from low 800 to mid 950s, while the wideband reported around 12.8 AFR. Stock O2s are worthless for WOT tuning.
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