Buick ECM Trivia

[Ludis Langens]

JTesta1966 at aol.com wrote:
> 
> <<  Putting a 148 chip in a 153 should
>  make it talk like a 148 - however, it might not run correctly when the
>  chip decides to switch to SFI mode. >>
> 
> Why? If the rom is the same, do you mean the processing inside is different,
> despite the program telling it to do xyz? I'm trying to understand the
> difference.

I haven't checked exactly what the '148 does when the software switches
to SFI mode.  (SFI is handled by an extra chip that isn't present in the
'153.)  The software might turn off the injector output from the batch
fire timer chip.  In a '153, that would shut off the injectors.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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