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Originally Posted by Fast305
For a while I was running BRDW which is the Mexican Export L31 TBI .bin that works without EGR. Lean Cruise worked 100% in that calibration, WITHOUT the EGR valve. There is an idle lean limit table that is only used at idle. Once the throttle is opened enough for the idle flag to be lifted the PCM uses the main open loop air/fuel ratio table or any additional adder table.
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I used that table awhile back to help cure my idle fluctuation issue due to my cams overlap. Tried everything from o2 swing points,o2 voltages, and gains, but nothing was working. The engine simply didn't want to idle at 14.7. What I finally did was use that table @ 4BA4 along with the Open Loop Idle Time @ 4BA3 to put fueling into open loop as soon as idle parameters where met, and run @ 13.5 min AFR as set by me in the min idle table.
As far as L400D bit 4 is concerned, I havn't seen a bunch of bins but suspect most do not have the EGR having the option bit being enabled @ idle due to the fact it will stall an engine at idle. Also bit 4 is irrelevant if the TPS % to enable EGR is at least stock @ above 3%. I will say that I must however be overlooking something because I've been on it for a solid week and have made 0 progress. Even tried reducing the VE table by 10% across the board to see if the AFR would follow the change, but all that did was bring INT up. BLM still stayed stagnant @ 126 and WB stayed right around 14.7-15 even though commanded was 16. Uncheck bit 0 and everything is back to normal. What am I missing????
On a side note, after swapping this 350 back in my fuel mileage even without lean cruise working is SOOOO much better and tuning is SOOOO much easier than that 383. This thing purrs like a kitten and appears to be getting around 14 in town, still, the goal of 21ish Hwy would be better.