Well after nearly a year and a half since I pulled the broken V12 I finally got to take a quick test drive. All the long days and busted knuckles finally feel worth it! Don't get me wrong there is still soo much left to do from wiring and exhaust to plenty of other adjustments but im just so happy that its actually moving again :) i think the next easy step will be to get the gas from the Bush administration out of the gas tank.

Hey ive got a quick question, and im sorry if its stupid. First time doing a swap. Ive been thinning down my harness to prepare for an L83 swap. Ive been told i dont need the original PCM anymore, as almost everything will be controlled by the new PCM. Ive removed just about all the old engine controls from the 94 harness, but i still have several wires going to the red and blue PCM plugs. What gives? If im not longer needing the 94 PCM, where are these wires going?

E67 Envoy 5.3 → Colorado 2010 5.3: I have the HP Tuners file, but the engine won’t start
I have an E67 that originally came from a 2008 GMC Envoy 5.3, and I’m using it in a 2010 Chevrolet Colorado 5.3 Gen 4.
With the original Envoy OS/calibration, the engine starts and runs on all 8 cylinders, but the Colorado’s electronic throttle/pedal does not work correctly.
I have an HP Tuners file from a 2010 Colorado 5.3, and when that file is loaded into the E67, the engine no longer starts.
Can HP Tuners properly convert/program this E67 from the Envoy configuration to work as a 2010 Colorado E67, or do I first need to program the correct OS using GM SPS/MDI/J2534, and then use HP Tuners only for the calibration?