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How are you measuring your AFR? When you say 1 equal perfect I will take that as you mean 1 equal stoich, which stoich(14.7) is 1 in lambda and 1 in eq ratio. When you say 1.3 I think you are looking at it as eq ratio which should be something like low 11's in AFR. Unless you are running a specific tuner program that value air/fuel as eq ratio or unless you was running ethanol it would be much easier to just read AFR.
What wideband are you using?
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