GM/Delco chip numbers

[Mike Fahrion]

> 
> EEPROM=TRUE.  Can't give you many details, but we use a scantool to
> download calibration files from the PC in the boss' office and then
> upload them into the vehicle. Think this started in 94 or 95 Geo storm,
> and all GM vehicles, AFAIK, are now this way.  If it's OBDII then it's
> probably EEprom.
> 
> Hypertech makes a reprogrammer for Camaros and maybe 'vette's, too. Saves
> stock calibration so you can pass the smoggies.
> 
>  Around this time last year, Steve Cole of Mastertune fame was working on
> breaking the code.  Don't know if he got anywhere.
> 
To my knowledge, the GM OBDII systems now use Flash instead of 
EEPROM.  I believe Steve Cole (now of The Turbo Shop) has a 
programmer now available to reprogram the flash through the vehicles 
J1850 (OBDII-type) bus.  Pretty sure I have a press release around 
here somewhere for it.

-mike
mfahrion at bb-elec.com