I have a 2004 Trailblazer with a P10 PCM, and am 'blessed' with having 5 different VE tables to tune. At the moment I am focusing on the low RPM Dbl/Sgl tables. These tables span 600-3800 RPM across the top, then call for a Load% down the side. I set up my histogram for LTFT and tried using 'Calculated Load', but it barely registered any data below the 50% mark (which means only the last three rows of the table have any data in them). I switched to using 'Absolute Load', and now I get a nice spread of data across the center of my table which seems to correspond to the actual driving conditions.
For the past week I have logged some data, then applied the numbers from the histogram to the VE tables (Paste special, Add), driven around 2-3 days and scanned again. Unfortunately something is not right. Every time I make changes, the histogram keeps giving me back a set of data with even higher numbers, and the average MPG reported on my dash has been steadily going down.
OK, I'm new to this, but I thought I understood the basics... Build a histogram that matches the sensors and values shown in the editor, log the appropriate data, then apply the LTFT adjustments to the VE table. Obviously I'm doing something wrong here. My best guess is that 'Load%' in the editor is not the same as 'Absolute Load %' in the scanner -- so what would be the correct item to use here? Is there a trick I can use to find the specific sensor used in the editor that should be applied to the histogram so I'm not trying to just 'guess' what I should use?
I've attached three files below. The text file shows the current VE table I am running, and you can easily see the band just under the center-line where the values have increased dramatically. Above the center-line, the values have been decreasing from stock, so overall I have adjusted by as much as -9 above the center, and +16 below the center. I have also included a log file from this morning (after driving for the last 3 days with the previous tables), and the config file for the scanner with all of the histograms I have set up. Hopefully someone can tell me where I failed.