Why cant tuners reflash a computer to OBD1, obd2 etc? Leave the wiring harnesses out of the equation for the moment. I just want to know why cant each computer be totally earaced and programed with whatever?
I ask this question because I want my 93 computer to have all the 94 abilities except maf. Sounds easy enough. Opinions please.

 

the 93s and 94s are different, itd be like trying to save windows 98 to a mac without a harddrive and only a floppy

 

Different layouts, memory sizes, different communication protocols, etc.

93 ECM - 256 kbit
94-97 - 1024 kbit
98-02 - 2048 kbit
03+ - 8196 kbit

A newer PCM's memory size may allow for a downgrade to an OBD1 program, but the layout of the board, components and the protocol won't, making it impossible.

 

Exactly what I was looking for. Thanks.