First time posting here and first time using HP tuners. I appreciate any help that is offered.
Truck comes in from a shop that had done an AFM delete - lifters, plate & new camshaft. The vehicle is a 2009 Silverado, that started life as LMG, 5.3L, VIN 0, with 164k on the odometer. The shop does the mechanical stuff and he has a buddy that has HP Tuners who attempted a tune. Vehicle has a misfire at an idle with the MIL on and flashing. DTC's stored were - P0172 Fuel Trim Bank 2 Rich, P0573 Brake Switch, and P1175 Fuel Trim Cylinder Balance Bank 2.
No P0300 stored, that's odd. Another oddity was BARO was at 82 kPa which puts the altitude at 5 - 7k feet. I'm at roughly 1,500'. Misfire counts are stored on 1, 4, 6, and 7. Cylinder 6 had the majority of the misfire counts. His situation is he needs a California smog test, for which the MIL has to be off with no DTC's stored and the Readiness Flags have to complete testing to pass. It's not going to happen the way it is now.
Relative compression testing was even and a compression test on cylinder 6 (165 PSI) with a leak down test revealed no problems at least on that cylinder.
I decided to put the factory tune in and used HP tuners to disable the AFM/DOD to "Disabled." First go around didn't take. DTC's P3401 - P3449 are set and starting it up it is misfiring on multiple cylinders. It now is setting a P0300 and BARO is at 96 kPa. I did this again after looking at a post that suggested to change DOD to off in all gear positions. I changed the 0's to 1's for all gears. It's a 6L80E, MYC transmission, if that matters.
This time no DTC's set until the engine warmed up and it was idling after a test drive. Cylinders 1, 4, 6, and 7 are counting up misfires that goes away above 1,000 RPM, and it sets a P0300.
Can someone look over the file and make suggestions on what needs to be changed to correct this? Sorry for the length of this post and I appreciate the help!
Thank you!
2009 Silverado AFM Delete .hpt