Beginner in tuning and looking for some help and L31 vortec questions.

[Douglas1300]

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 my tail for a week as to what I did wrong to lose spark when really I just had an ICM go bad coincidentally at the same time as I did the swap.

[dfarr67]

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 my tail for a week as to what I did wrong to lose spark when really I just had an ICM go bad coincidentally at the same time as I did the swap.

Ah- you had it easy with the 'black box' ecu.