i set a very general SD tune up for my friends truck last night and everything was working fine except i noticed after my flash was done the Fuel trims no longer worked in gear. At idle the fuel trims are active and sweeping like they are supposed to but as soon as the truck hits reverse of drive it goes rich and stops trimming. I had to send him home so i showed him how to force the trims on in the scanner and that works for now until i can get them on.
i left all the closed loop parameters on as we are using the O2 sensors and trims to tune instead of a wideband which is still tied up in shipping. Has anyone else ever ran into this issue before? Im waiting for him to come back over so i can post the tune up here.
2000 Chevy Silverado 6.0 Swap with factory 5.3 computer.