Yes, air/fuel ratio, AFR. If you run a common narrowband lambda/oxygen sensor, throw it out the window. You WILL! be better of simply smelling the exhaust fumes. Tuning should only be done with wideband sensor - do a google search if you dont believe me. I tried, stubborn as i am, using a narrowband on my first project years ago, but it is nothing more but a lean/rich sensor, telling you the outline of the mixture, but not any exact details which is an absolute must - therefore useless at best.
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