Once lean cruise is active it will not use semi open loop trimming. If you watch the Commanded EQ when lean cruise kicks in you will see that commanded goes away from stoich, preventing SOL from being active.
Once lean cruise is active it will not use semi open loop trimming. If you watch the Commanded EQ when lean cruise kicks in you will see that commanded goes away from stoich, preventing SOL from being active.
The Tremor at AIR
Yup, just enabled lean cruise today and saw that happen when it leaned out. Pretty neat!
2001 Silverado 5.3L ECSB 2WD T56:
T76 turbo, Meth injection, 72# injectors, 799 heads, 212/212 114LSA cam, Built 4L80E, 3.42's
EFILive V1 Commercial, COS5 2-bar SOLSD, AEM wideband
I loaded COS5 the other day and can't get lean cruise to work. The attached cax file (02020005.cax) is in C:\Program Files\EFILive\V7.5\Calibrations and the attached cal_link file is in C:\Program Files\EFILive\V7.5\Configuration. Lean cruise is enabled and was working in the stock-OS based tune I loaded after flashing COS5. Not sure what I'm doing wrong, any suggestions are appreciated.
Have to do full flash when LC is activated by .cax, then do normal cal flash to fill in the rest like regular COS procedure.
Last edited by Chevy366; July 31st, 2014 at 06:49 AM.
2005 1500 HD , Custom OS3 SD tune .
2006 Trailblazer
Dinosaurs and Plants gave their lives so that we may drive , long live fossil fuel .
Yes, the file 02020005.cax was in place when I did the full flash of COS5. Then I cal-only flashed my previous tune file from the original OS. B9001 is enabled and I have valid numbers in the lean cruise tables & parameters. When I drive over the LC activate speed the commanded AFR does not change, like it did before I went to COS5.
Do I need to do something else - besides having the cax file in place - when I do the full flash to activate LC?
Yes, you have to enable LC, save file, and then do a full flash of this file, as Chevy366 said above.
Then you have to populate the LC tables and do a cal flash.
Got it, thanks. I just had to do a full flash with the file I've been using. So the process is: full flash of the COS with cax file in place, cal only flash the latest tune file from the original OS, save the tune file, then full flash that tune file.
You already have a current COS tune file
(i.e. you already full flashed in the COS, you already cal flashed from the original OS to populate the COS, you already read back the COS from the PCM and saved to file... you may have done further edits and flashes, and now this is your current tune file);
within your current tune file, enable LC and do a full flash, then populate the LC tables and do a cal flash.
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