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Given your narrowband O2 Sensor is by no means the most accurate, .02 means you are running very lean. On a stock O2 Sensor if I remember correctly, the "ideal" voltage is .45... which means it is at an optimal air/fuel mixture. Anything below that is lean, anything above that is rich... relatively... based on the number. I'm sure you already know that, I just wanted to throw that in there for anyone in the future that may experience the same problem as you that is searching.
Does it always lean out at 4000rpm's or only when under heavy acceleration?
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