02 Sensor heater diferances between 4.8/5.3 and 6.0?

[mecanicman]

It appears that the lower gvw trucks with 4.8/5.3 use the pcm to control the heater for the 02 sensor more actively than the higher gvw 6.0 trucks. I am doing a swap vehicle and put a 6.0 file into the truck. With the headers the 02 sensors take forever to heat up and cycle. I tried a few different files from different models with the same results. When I put a 4.8 file back in the sensors heat up and cycle right away. Wiring from what I can see is identical. Anyone else noticed this? Anyone know where these parameters are located and how I might turn them on in a 6.0 file?

[7T8LS6]

What tuning software are you using? If its tunercat, I was unable to find where you change the O2 sensor timers based on whether or not it is cold or nornal engine temperature. In EFIlive, its under engine calibration>fuel>O2>parameters.

[Munchies]

The 02's changed in 03? when going to the newer "LS1B" style '0411' ecm.

[mecanicman]

No, 2002 was last year of 0411 style PCM(except corvette) which supplied constant voltage to pcm. 2003 is the 1 mb PCM and the ground side of the o2 sensor feeds to the PCM for control. O2 sensors are different.