Originally Posted by
murfie
Targeting a different commanded lambda, just changes the stoich AFR at the desired area.This isn't an appropriate way to correct closed loop O2 error.
If the O2 sensors are seeing blow through air, reporting lean, this will not correct the error they report. It would have to be done using SD blow through. Or abandon the closed loop fueling all together.
On the other hand if they are saying a cam lope tune is rich, you should be able to correct that by modifying they way it determines mass air(MAF) or mass fuel(injector flow, fuel pressure) at idle. If its saying rich, and your changes do not have an effect, I would be looking at injectors for leaking fuel.