How's it look now?Originally Posted by 2000C-5You need to:
- set the Engine/Fuel Control/OL & CL/Closed Loop Closed Loop Enable/ECT vs IAT to 284* across the board. This will put you in open loop along with setting the MAF fail freq to 0.
- on the same page as above, you want to disable LTFT
- also on this same page, in Open Loop/EQ Ratio, set all to 1.00 or I just set the ones from 140* and up to 1.00 (this will command 14.63 or stoich)
This step can be done several ways too. You can leave it as is if you want or change it to 1.13 which will command 13.0 AFR, because it doesn't really matter what you are commanding, because the % error will still be the same. After going back to Closed Loop this table isn't used anymore.
- in Engine/Fuel Control/Fuel Cutoff set DFCO enable temp to 284*
- in Engine/Fuel Control/COT, Lean Cruise set COT to disable
- in Eng. Diag/Airflow set MAF fail freq to 0 (you should also unplug the MAF if you can, but you won't be able to because your IAT is wired in the same plug, they are seperate in the earlier C-5s)
Now go log. Make sure you log VE for AFR, commanded AFR, and AFR percent error. I log first and then change the cell hits required to 25 for the percent error. Right click/Copy the percent error histogram, open Editor and use the paste special/multiply by % to the Engine/Airflow/General Airflow/Main VE/Primary table. Then, if you have a 1997-2000 C-5, copy the even numbered MAP lines to the secondary VE table by using the old copy/paste method. Save and "write calibration only" to the PCM. Drive and see where you are.
After this, reset the MAF fail back to 14000 (leave everything else as is for now) and do the same thing for the MAF tables using MAF vs Output Freq (Hz) histograms instead of the VE histograms.