For a 7747... I have this thing where if I hit the low RPM/low MAP cells while driving the BLM values come out sort of reasonable (in line with nearby cells), but if I stop and put the trans in park, they just go up up up. My most recent tune run showed BLM's around 130-135 while driving and as high as 167 while idling in park. I'm attaching a pic of my logged table from TunerPro. Look at the upper left of the table and you'll see these anomalous values up over 150. Using these is give me strange bumpiness in the VE table as I tune.

Any ideas what might cause this?

 

I dont see any issues? Just adjust the Ve table.

 

What program are you using there? TunerPro? Version 5?

 

The issue is that the BLM seems to climb when idling compared to when the same cell is exercised during normal driving. I have been tuning to it, but the result is a weird bump in the VE table in the cells around idle. I don't believe it is correct, I think a VE table should be more or less smooth.

 

Most recent TunerPro RT.

 

I believed they should be smooth. But last 10 learns I reduced the smoothing factor and did nothing additional after the ECD did minimal smoothing. Result is I am seeing better BLMs the more I datalog(VE Learn). Add the fuel it wants and see what happens. you may see improvement toward 128.

 

Mastiff

You may want to check if you are firing the injectors in async mode at idle when the blms are climbing. If you are then it may be an indication that the injector bias is set incorrectly.

 

How can I tell? Thanks.

 

There should be a flag in your log data that tells you when you are in async mode.