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I pulled the plugs after hitting 14.1 AFR on my AEM UEGO at the 1000' mark. They look light tan with no visible signs of detonation. The fuel ring is narrow, about 1/16", suggesting a lean condition. I have the O2 bung in the middle of the collector and a 12" turndown after it. I know the engine is lean, but 14.1?!?!? Does anyone know how accurate these UEGO O2 systems are?
 

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Put your trust in the plug read, all the rest of the stuff can lie to ya. I use the O2 and EGT reads for general information and direction pointing in tunning the motor.

Blessings.........Ron.
 

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