2xLS1

iTrader: (25)

I tried reading a 02 Vette today that has been previously tuned at an unknown shop. HP Tuners would read the file but would not open it because of an VIN/OS mismatch. I was able to ID the OS# with TC OBD2. I suspect it is an EFI Live COS. Can anyone with EFI Live experience verify if an OS ID 2030003 used on a 02 Vette is indeed an EFI Live COS?

JOHNBOY66

OS 02020003 is the custom 2-3 bar SD operating system of GM OS 12212156 from EFI Live.

2xLS1

iTrader: (25)

Thanks. That is not an exact match of what it has in it. It is a Z06 so it started out with either GM OS 12221588 or 12593358. That OD ID 02020003 is close enough to what it has that it was probably tuned with EFI Live though.

foff667

iTrader: (2)

Glen, you should be able to have the pcm flashed back to stock via tech2 or similar then just reread with our software so you can start from scratch in these cases.

JOHNBOY66

The information I have says the same as you posted. 2002 ZO6 stock OSs are 12593358 and 12221588. Both have custom SD 2-3bar versions from EFI Live.
12593358= EFI Live OS 02040003
12221588= EFI Live OS 02030003

As mentioned you should be able use a Tech II and flash it back to stock if you don't mind starting from scratch.

2xLS1

iTrader: (25)

The car seems to have a really good tune in it and is making close to 700 rwhp as it sits (twin turbo) so I really don't want to start from scratch. We're just going to add some ID2000 injectors ans switch it to E85. We've located someone local with EFI Live that's going to let us use it. This is not entirely my deal. Just helping a local shop.

roughneck427

iTrader: (12)

I have added EFI live COS OS numbers to TC in the VDF editor and able to read out with TC and open up in tuner editor