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I have a really small exhaust leak on a vband flange that I can't get rid of. Its before the turbo. I have the wideband about 3 feet after the turbo.
I can't actually feel any air come out of the connection but I can hear it and see a black stain near the leak
Will a small exhaust leak change my wideband readings a lot?
I think it will....
well the leak is so small that I'd guess probably 1/1000th of the total air volume is flowing through that leak.
Wouldn't the air that flows out the exhaust leak be mixed are therefore not effecting afr? I wouldn't think fresh air will flow into the piping because it is pre turbo and the backpressure should be higher then atmospheric.
YES. Fix the mechanical problem before you get too deep into the calibration.