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The factory ECM was not the primary problem, it was the programming. GM has always guarded and continues to guard its programming with encryption, making repair, diagnosis and recalibration extremely difficult. Even if you have access to one of the many calibration programs and an EPROM burner/eraser, the iterative process of tuning for maximum performance and acceptable driveability can take years in extreme cases. If you're one of the few who has more time than money--or lots of time and lots of money--this may be a viable option for you, but it sure wasn't for us.
ACCEL Gen 7 System - Magnum Returns

 The factory ECM was not the primary problem, it was the programming. GM has always guarded and continues to guard its programming with encryption, making repair, diagnosis and recalibration extremely difficult. Even if you have access to one of the many calibration programs and an EPROM burner/eraser, the iterative process of tuning for maximum performance and acceptable driveability can take years in extreme cases. If you're one of the few who has more time than money--or lots of time and lots of money--this may be a viable option for you, but it sure wasn't for us.  View Related Article

 

 

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