Christian Steffen
I'm Awesome
I just did an 0411 PCM swap on my 99 Suburban. The process is pretty straight forward and easy with the proper pin out sheet from Lextech.
I'm trying to do mine with HPTs. I have the L31 Engine segments from the Chevy express Van along with the 4l60e trans segments from an 01 Sierra as my base. The fuel trims are way off and I'm getting KR under medium to heavy load. I want to eliminate the KR before I start the VE tuning so I keep pulling timing and reshaping the timing table. It's going slow...
I kind wish I would have just gotten a PCM from Lextech from the beginning. I've done quite a bit of research and couldn't find ANY established GMT400 tuning provider who uses HP Tuners. Pretty much everyone using EFI Live.
Redline, the stock L31 timing table for an express van didn't work?
Is your engine modified?