ever since I did the 0411 pcm swap, the speedometer hasn't worked. Has anyone else had this issue and does anyone know how to fix it?

good to know it seemed like the exhaust was still pretty hot even after opening it up more than the stock exhaust was.

I used a pinout spread sheet from Lextech (Jeff) to pull the pins out of the 4 connector style PCM and install then into the 2 connector 0411 connectors. it was pretty easy really, but I had to chase...

I have a 99 suburban that has a GMPP HT383E in it with 0411 PCM swap. I'm trying to start dialing it in. it currently has a stock 02 express van tune on it.

first off, i'm curious of the flowrate...

running now. just a little rough with a lot of misfires.

so I think I figured it out. I tested the signal from the PCM with an LED and it was goo. so tomorrow I will get and ICM and that should fix it. it is quite a coincidence for that to go bad at the...

I have continuity from 26Red pin to ICM white wire, ICM WHT/Black to Coil, and ign power with key on to both, also good ground to ICM. so the only thing left is what signal to test for and how from...

it sees RPM while cranking.

So, im trying to complete my 0411 swap in my 1999 K1500 suburban with an HT383E from GMPP. I swapped all the pins from Lextech's spreadsheet and set the VATS to none, removed the generator signal...