You cannot blindly use cells 0 to 19 as a bulk value since some cells are used for decel and fuel learn is off thus your trim average is bloated since its adding into the trim average when PCM is commanding fuel off thus would be leaner on decel but being added to when fuel is commanded on
I was thinking only in cell 21 the PCM will turn off fuel learn (in fact I see an AFR of around 13 on the WB but the LTFT remain constant at about -2%). During fuel cut off it's another story.
I also see cell 0,1, 4 and 8 in decel (mostly 0 and 1) but the AFR is stoichiometric (so I assume the PCM is learning).
What cells would you consider? I tried 0-19 and 0-15 and the result is exactly the same.
For MAP over 85 - 90 kPa it's quite difficult because it goes in PE, so I just continued the line by feeling (values 90 - 100 kpa). Is there another way to determinate this last piece of the IFR curve?
Stefano
