MetroMPG -
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Originally Posted by MetroMPG
Does this only apply to an engine operating in closed loop mode?
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I will make sure to display the Open/Closed loop parameter when I repeat the WOT+low RPM test.
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This is one of the drawbacks of the ScanGauge, in my understanding. It's relatively accurate provided you stay in closed loop, where it can make calcs based on stoich A/F ratios. But when you get into open loop fuel enrichment at higher loads, it doesn't necessarily know how much more fuel the computer is injecting.
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Are you implying that it is using the 02 sensor feedback? From my experience, I do not think it does.
I think it makes calcs based on the assumption of 14.7/1 AFR ratios, but it *derives" it's MPG from all the other data inputs.
CarloSW2