Background: Gen 3 5.3L LM7 out of 2005 silverado in a 2007 Jeep JK Wrangler. I didn't do the swap so I may not have some details on the components. Conversion is using a BP Automotive harness.
This thing has been doing this for some time. I thought I found the issues. NOTE: That this is my first attempt at tuning, but I thought I had it in decent shape yesterday.
Issue 1 - the MAP sensor was wrong and only reading in the 80's key on, engine off - FIXED
Issue 2 - The swap was using an LS7 MAF with integrated IAT and the stock LS1 MAF tune - (Tuned it for the LS7 MAF and used the IAT settings off the forums)
Also, ignore the speed in the Drive to work 4-23.hpltune I had not set up the gearing yet.
I tuned this over the past weekend and drove it for two days and everything was running great. The VE table needed some more work, but I just did a couple passes on it this weekend.
Drove it to work this morning and the O2 sensors and fuel trims are acting crazy. Bank 1 is showing crazy lean and LTFT's on that bank maxed out. Bank 2 is still fluctuating but running rich. Log file attached (Drive to work).
Later that day I go to lunch, everything is fine again but pulling a lot of fuel out (-12) in the 800 rpm range (log LUNCH 1). So I took some out there and did another test drive. All the LTFT's came in -5 to -1. (Lunch 2 logfile)
On the drive home, bank 1 goes crazy lean again. (Logfile Drive Home) I managed to get it home and changed out BOTH O2 sensors. Also when I did that I unplugged the passenger side one and ensured that the pass side went to 450 mv to rule out the wiring being backwards. The driver's side was fouled out, so the plugs probably are too.
It didn't seem to help anyway though, see logfile (both o2 swapped). I checked the fuel pressure (this has the return line system) and it is reading 48 and when I pull the vac line off of it it jumps to 54 psi. (That seems low so I'll see if I can find out what is going on there. Going to test it again in the morning)
Also note that I hooked my Wideband up when I got home (stuck it in the tailpipe).
Note that I did drive it on the interstate to work and back and none of my tuning was on the interstate. So maybe that is it, but this problem has been going on for months... I really need some help.