Park idle rich, in gear at same rpm/map not

**TheApocalyptican** · 03-28-2013

Originally Posted by EagleMark

You could lower the BLM min, but realistically you need to pull some fuel from the idle cells.

What bin? BCC code?

You sure it's in Closed Loop when reading 128 BLM? You can post a log if you want us to take a look?

$42 ASDU. The low blm question was more of a curiosity than anything. It's definitely in closed loop. It's not a dead on 128 just around there due to my tuning. I'll get a log posted up here soon and see what you think.

**EagleMark** · 03-28-2013

Post your bin too.

**TheApocalyptican** · 04-08-2013

I am about to do some datalogging, and while check my bin used for tuning to my bin that is normally used I noticed two differences that I wasn't sure of. I'm pretty sure it is but....is the checksum different based on every little change in a bin? My tuning bin has everything turned off that would affect the logging. Does this then make the checksum different? The other that I am less sure on is the ----Fuel---- scalar. My tuning bin is 121, but my regular bin is 119. Is this setting one that is different due to the certain scalars being off for tuning?

Also, back to the BLM, just for a initial recheck of the fueling, how low can I drop the low end of the blm? IE: How low can the ecm read the blms?

**EagleMark** · 04-09-2013

Checksum will change every time you make a change to the bin and save it in TunerPro. Automatic nowadays. Used to have to add hex...

I'm not sure how low min BLM can go? Really this is not a tuning tool, if your rich at idle take out fuel from VE table. 128 is the half way point of 156 bit so should be able to lower it? Honestly I don't know how it will effect the rest of algorithm of the ECM...

The " ----Fuel----" I think your looking at a title to separate things, not a paremeter, don't change it! In the next version of $42 they are marked as "Do Not Change!" Right click on it and Edit XDF, if the hex address is 0x00 it's a title, does it look like this? "-= FUEL =-"

**TheApocalyptican** · 04-09-2013

Originally Posted by EagleMark

Checksum will change every time you make a change to the bin and save it in TunerPro. Automatic nowadays. Used to have to add hex...

I'm not sure how low min BLM can go? Really this is not a tuning tool, if your rich at idle take out fuel from VE table. 128 is the half way point of 156 bit so should be able to lower it? Honestly I don't know how it will effect the rest of algorithm of the ECM...

The " ----Fuel----" I think your looking at a title to separate things, not a paremeter, don't change it! In the next version of $42 they are marked as "Do Not Change!" Right click on it and Edit XDF, if the hex address is 0x00 it's a title, does it look like this? "-= FUEL =-"

I'm just worried about maybe having to adjust from 108 flat... which means multiple adjustments before fine tuning can begin.

The ----Fuel---- is a title to separate. I just don't ever recall seeing it show up when using the difference tool.

**EagleMark** · 04-09-2013

Hex address 0x00 is actually first part of Checksum. So if Checksum changes then so will all Titles...

I guess the real solution would be ask Mark Mansaur at TunerPro to add a new XDF object.

I'm just worried about maybe having to adjust from 108 flat... which means multiple adjustments before fine tuning can begin.

Multiple adjustments are part of the learning to tune game. I still can't get it right first shot.

I've got a strange problem with the Suburban in my signature(or at least seems strange to me, but maybe is normal)where the 800/30 cell(I think the 800/40 does too) runs down to 108blm when in park. This same cell when in gear however is tuned to, and registers when logging to be around 128. I've gotten everything dialed in, but these cells at idle in park. Biggest reason I am concerned is that I've got an emissions test coming up in early May, and here they do a parked idle, and a parked 1200 rpm test, and I'd prefer to have the fueling where it should be. So is this something that is normal, and either way, is there something I can tune to fix this?

I think I told you this but idle in park and idle in drive should change cells, it changes RPM and load so it has to move some. Also it's not one cell, it is that one cell and four surrounding cells interpolated to come up with the number used. This is why smoothing helps so much in tuning. Also Park/Neutral uses a different BLM learn cell then if in drive, so BLM will be different.

If the tune is that close and all your worried about is idle for emissions and the BLM is bottomed out? Try this, "O2 - Idle AFR Bias Value" I believe this is subtracted from O2 sensor voltage to produce a lower AFR for idle, so raise it. Let us know what the resulting BLM does.

Also always base your data on a totally warmed up and driven truck, especially for idle! I've found to dial in a perfect idle on TBI to do it at end of a data log run.