Can a GM ECM be tuned

[David Posea]

Thanks!! This is what I've been looking for. I'll check out an EMP-20. Does
anyone make a socket for the flash chip? if so, it should be easy to make an
adpater. Now I can start digging out the calibration info.

David
-----Original Message-----
From: Andrew K. Mattei <amattei at mindspring.com>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: Sunday, July 30, 2000 5:09 PM
Subject: Re: Can a GM ECM be tuned


>>So what is necessary for reflashing? Can it be done with common equipment?
>
>
>>>They can be reflashed... Not sure the address, but there are several
>people
>>>that have cracked into the PCM for the 96 LT1.
>>>I also believe there is a rom dump from that PCM on the ftp site...
>>>ftp://diy-efi.org/incoming
>
>
>Well, I've got an LS1 PCM on my desk right now that I'm going to be
removing
>the flash chip from and reading with an EMP-20 (the chip is an Intel
>AB28F400BX - 4 Mbit flash chip). Biggest problem is that it uses a chip
>package that doesn't lend itself to being inserted in a conventional
>reader/programmer very well. I'm going to make a little adapter for it if I
>can, and if that doesn't work, I'll carefully solder wires on each of the
44
>legs. ;)
>
>The 94/95 LT1 flash chip is *easy* to work with, since it's a standard
>32-pin PLCC package. Took about an hour for me to build a PLCC to DIP
>adapter so I could read that one with my burner.
>
>As long as your burner supports the chip, you can read and flash it all you
>want. My Needhams EMP-10 supports the Intel AN28F512 that's found on the
>94/95 LT1 PCM, but the replacement chip from Catalyst (CAT28F512NA) doesn't
>work in the EMP-10 (but it does work in the EMP-20 we have at work).
>
>Gotta watch out for flopped address lines, though. GM does that. ;)
>
>-Andrew
>
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