I am hoping someone can enlighten me as to what the problem is with my current project and getting it tuned correctly.
I have installed a 6.0 with 243 heads and a mild cam into a 91 K1500 pickup.
My initial attempt has been to dial in driveability with the Factory 02 sensors and Long term trims, as it wasn't reading as being too far off when I first fired it up.
I turned off everything MAF and used these factory O2 sensors with a Histogram I created to dial in the main VE table and it runs and drives pretty decent that way.
I then turned off everything MAP related and went to dialing in the MAF sensor.
I created a histogram using Long term trims and MAF sensor Hertz and here is where it went sideways. I want to understand what has gone wrong.
The trims started as under 10 and after a few tuning trips I have them dialed in really close. Most are under 3. But it seems like the closer I got to optimum the worse it runs. It hesitates, pops, bucks, you name it, it just runs badly.
My current plan is to put my wideband on it next and see what the AFR actually is this way, but I am really wanting to understand what I have done wrong here, and why this method did not work, as I have used it before multiple times with no issues.
Thanks,
Roy