Open Loop BLM?????

[ralmo94]

So for some reason, after getting spark curve issues inline, when tuning ve table open loop, I get BLM? Anybody ever have that before?

I did a quick search and I couldn't find anything.

I'm tuning in $OD on a 94 GMC 5.7. I have a wideband installed to EGR channel to the 7427 equivalent (6395)

closed loop enable temp is maxed, and data log shows open loop.

BLM update min RPM maxed out.

I don't understand why BLM's are updating in open loop?

I went ahead and burned another chip with min BLM max BLM both to 128 and changed BLM step from 1 to 0.

Tune log entries

07/12/2020 20:38:36 Scalar: Minimum BLM changed from 105 BLM (0x69) to 128 BLM (0x80).
07/12/2020 20:38:49 Scalar: Minimum BLM at Idle changed from 90 BLM (0x5A) to 128 BLM (0x80).
07/12/2020 20:38:56 Scalar: BLM Step Value changed from 1 BLM (0x01) to 0 BLM (0x00).
07/12/2020 20:39:06 Scalar: Maximum BLM changed from 165 BLM (0xA5) to 128 BLM (0x80).
07/12/2020 20:39:14 Scalar: Maximum Initial BLM changed from 135 BLM (0x87) to 128 BLM (0x80).
07/12/2020 20:39:24 Scalar: Minimum Initial BLM changed from 126 BLM (0x7E) to 128 BLM (0x80).



I will disconect the battery to clear BLM and try tuning VE again.

Maybe I don't understand, but I was under the impression that all qualifiers had to be met to trim fuel, Closed loop enable, INT, max RPM, TEMP. Does someone know how the code logic works? Does it look for 1 before the other?

I have no idea. Weirdest thing to me to have open loop BLM's while INT's stay locked at 128

I thought with a Wide Band this thing would be easy to tune. I still think if it would do what I'm trying to tell it to do, it would be.

[ralmo94]

i hope it was ok to post my bin here. I just read a thread stating that it's not cool to post modified bins on a public thread. I always thought if you had something weird going on you were suppost to post your bin, so if anyone interested in helping could see what you did that might be wrong. If I have broke the rules, I sincerely apologize. I never intended anyone to try to run a bin I posted that might have issues

[1project2many]

It's OK to post your .bin for the sake of diagnosis.

I'm unsure why your BLM numbers are changing. They should remain at 128. I may not have time to look at your files today. Are you seeing changes in the actual BLM or the BLM Cell#?

[ralmo94]

It's actual blm. I when I looked at wide band in the same areas blm was under 128, wide band was lean. Above 128, wide band was rich. I no longer have a narrow band on the truck. Any narrow band reading is from simulation from wide band. Thanks

[steveo]

the BLM (long term trim) values can change in open loop, if you have stored trims in a cell, and you're changing cells.

that doesn't mean they're updating (if your INT is 128, they really can't be)

[ralmo94]

the BLM (long term trim) values can change in open loop, if you have stored trims in a cell, and you're changing cells.

that doesn't mean they're updating (if your INT is 128, they really can't be)

That's what I thought also! Truck has only had open loop tune since last battery disconnect, and a long long time before that. If you look at the data log, it shows deviation range. I understand that trim cells don't exactly correspond to VE cells, but it shouldn't have any BLM, as I have not seen it go closed loop, and have not ran a closed loop chip. Disconnected the battery this morning, don't have a new data log as my laptop was dead.