Nothing better than heat,vibration and whatever else that can be thrown at the PCM under the bonnet.
Cont:
What i ended up doing was using my existing V6 body/instrument loom and the original low level BCM.
This let me keep my original ignition key/barrel which is linked to my BCM (1 less hassle)
The next thing was that the V6 is UART serial data (i think)and the GEN3 PCM communicates through class 2 serial data which is converted to UART serial data
through the P/train Interface Module (PIM)and then sent to the BCM and instrument cluster.
NOW...this meant i had to chase up a (PIM) (which sits in the LHF kick panel).
I also fitted a VX SS cluster to my dash.
Surprisingly the LS1 engine loom plug pinouts almost matched up to the V6 body loom/BCM.
Delete a couple of wires and add an extra wire from the PIM to the diagnostic connector under the dash was all that was needed.
Once all the wiring from V6 to LS1 was converted,the next thing to be done was link the BCM to the PCM and then to the PIM.
A Tech2 would be required to do this.
Meanwhile i was fitting the starter/alternator wiring in between the brain drain of the above saga.
I forgot to mention that an LS1 fuel line harness and pump was fitted as well since the V8 lines are a bigger diameter.
As it was getting more difficult borrowing a Tech2 from work,I had noticed the influx of chinese copy Tech2's hitting the market.
A workmate had just bought one and i had been thinking about getting one for the track car to make sure all that i had done was gonna
work..eg wiring,linking,sensors and DTCs.
I bit the bullet and bought one as well.
These Tech2s come with chev software,but i updated my card with Holden software.
After linking the PCM and BCM everything was going except...linking of the PIM to BCM and PCM.
I had trouble getting the PIM to link and learn the "password" for theft deterrent.
I tried a few times to get it to link but failed...
This requires - 1hr10mins ignition on then ignition off for 30 secs then repeat 2 more times...a total of 3hrs and 30 odd minutes.
Password learn failed about 4 times,that was 14 hours or so stuffing around.
The car would start and then shut down.The PIM hadn't learnt the "password" and shut the injectors down.
To say it was getting to me was an understatement.
I was thinking that i may have stuffed up some wiring or done something wrong or missed something,double checking this and that.
I knew it had to be the PIM password/VATS.
A workmate had a PCM with VATS disabled and lent it to me to try out.
It fired first go and kept running,so i was relieved that my wiring etc was OK.
Then it was back to my PCM and PIM to learn again,then it dawned on me when selecting on the Tech2 to do the "learn"
procedure,i was pressing the wrong "Enter" key to highlight an asterix to begin the learn mode. (the tech2 has 2 enter keys)DOH!!
3hr and 30 minutes later....it was time to find out.......FINALLY i did it right
More later!
I have a VY auto body loom - VY auto LS1 ECM - VY BCM/key - VX auto LS1 engine loom and i wanted it to fit in a VT S1 V6 auto 
i would have just disabled vats 
