o2 numbers

[andytalon]

When at idle, should the O2s be .01, .02 exex, or should they be .92??? Or is .92 only at WOT?? a bit lost here because I think I may need to lean my afc down for some reason at 1k because my idle is high and ive done everything to fix it but its still a bit high. I dont get knock at idle, and it says my LowFT is at 139%, so should I just go for it and lean it out a bit. What is a Danger point I should watch for my EGTs??

AFPR- 38psi (vac line off)
Timing- 5*
Biss screw- all the way down
No boost leaks

Anything would be awsome, Thanks!

 

[DSM90AWD]

When at idle, should the O2s be .01, .02 exex, or should they be .92??? Or is .92 only at WOT?? a bit lost here because I think I may need to lean my afc down for some reason at 1k because my idle is high and ive done everything to fix it but its still a bit high. I dont get knock at idle, and it says my LowFT is at 139%, so should I just go for it and lean it out a bit.

At Idle your ECU is in "Closed Loop" and your O2 voltage should oscillate smoothly up/down from 0 to 1V. If it does not, then your trim at that airflow/rpm level is likely maxed out and the ECU cannot compensate any further. This is shown in your LTFTs (Long-Term Fuel Trims). The 91-94 ECUs fuel trim adjustments go from 60 (way rich) to 140 (way lean). 100 is the midpoint at which no adjustments have been made (also were you start at when you reset the ECU).

As you are at 139%, you are running extremely lean and your ECU has added in +39% adjustment to fuel. My suggestion is to log "Oxy Feedback" (Short Term Fuel Trim) and add fuel in on the low settings of the S-AFC at 1K-3K RPMs and try to get the STFT curve to oscillate around 100% (testing/adjusting each each RPM separately). This will get you ballpark. Then re-set the ECU (reset the LTFTs) take it out for a drive and see where you end up and re-adjust if necessary.

Biss screw- all the way down

You do know that the BISS is meant to set base Idle. Simply screwing all the way will likely take your ISC motor out of its operating range and you will have Idle surge/high Idle problems