Hi!
I just completed this very same conversion on my ‘96 Trans Am WS6.
And you’re right about Kyle’s (“Horsepowertubes”) pinouts, If he would clean up the sheets he posted and make the instructions more clear, they would help explain things better.
he stated using the 5 volt reference wires merged together for some sensors. He listed all the factory LT1 connectors C-1, C-2, C-3,C-4 and put notes on the pinout sheets, I believe it would make things clearer to just place the notes on separate sheets. The unused pins with them being “Lined out” just adds to the confusion. If you are deleting emissions wiring, if those wires were “High lighted” in a specific color Like LT1swap.com (Brandon) does on his pinout sheets.
Since the 2001 Chevy Express Van with the 350 Vortec engine has a crankshaft position sensor and Camshaft position sensor, it’s got the same firing order as the LT1, same ignition coil And module. You need to start with a base 2001 Express Van tune for an L31.
I have all my emissions turned off, the cam sensor is set to fail for “Batch Fire” mode (the cam sensor DTC and MIL light are turned off)
my first start was pretty rough, (when I first started “re-pinning” my harness, I replaced the “MAP” sensor connector, because the lock tap had broken off) well , I un-pinned the original connector, and I didn't mark The original positions of the 5v ref. And ground wires, which were swapped,
Made the engine run awful. So I started checking my sensor voltages and checked the harness from the PCM to the connector for continuity, they all checked out fine ( because the color codes of the wires and the PCM connector numbers were spot on, that threw me off, I kept getting weird readings from my MAP sensor, the 5volt reference signal volts were now reading 1.75volts. I checked the Schematics, and looked at some photos of other LT1 engines and noticed I had the two wires mixed up.
Once That was fixed, the map sensor read just like the vacuum/voltage chart said. The engine idles much better, isn't running “Pig Rich” and Now I can move onto tuning it better.
I am Using “LS Droid” with the “OBDLink MX+” to read and flash my 0411 PCM. I can also Data log using the OBDLink MX+ As it’s a bluetooth elm dongle.
As of right now, I have to replace one of the two O2 sensors (Bank two is not reading correctly and I just replaced both with new Delco sensors)
That should make it run a little better.I’ve also got a “back fire” in my exhaust randomly, and on deceleration,
Probably due to the O2 sensor.
If anyone has any suggestions, or questions, please feel free to ask!
Have a good one!
Ben Smith