Reversing the '8625

[Matt Bossard]

Mike, I am very interested in your project.  I am also planning to reverse the
cal from a PCM out of a '95 TBI 5.7L truck.    The number on the the PCM was
not printed very well, but it looks like 0764700.   I wonder if this cal prom
will turn out to be similar to yours?

Did you start off with any knowledge of the contents of the prom to begin
with?  What has been your basic plan of attack?

Thanks for posting the link to the data.   I will be eager to see the progress
you make.

Thanks,
-Matt

> Hi all,
>
> I've started the process of reversing the cal from an '8625 TBI PCM.
> This is from a '93 4.3L CPI "W" engine code Olds Bravada (same as
> Blazer, etc).  The PCM also controls the 4L60E transmission.  This
> same PCM is also used on some 5.7L TBI trucks of the '93-'94 time
> frame.
>
> I've sent the file to a couple of list elders already, but thought that I
> should let the general list know in case someone else is interested
> whom I don't know about.
>
> At any time you may find the reversed cal at:
> http://www.emi.net/~mpitts/Bbnt.asm
>
> I will update this file periodically as I make progress, which will no
> doubt be slow since I am *not* very good with assembler level code.
> I am sure this will be littered with bugs, but it's all that I have.  If
> you find any in the code I would want to know about, please let
> me know.  I can be reached at: mailto:mpitts at emi.net
>
> The ultimate goal is to find the transmission, fueling and spark
> parameters so I can turbocharge the engine and alter the shifting
> characteristics.  This may be of interest to those who would want
> to add a supercharger to this engine as well.
>
> Thanks,
> -Mike