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Exhaust oxygen percentage

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What's desireable? I just passed emissions :banana:but my o2 %'s seemed high at 4.49 (cruise) and 9.58 (idle). In order to pass emissions I retimed it to 20 deg BTDC and installed a new o2 sensor. We're talking EA82T here, and it was a static test. In any case, it seems like it's time for that AFR gauge.

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