It depends GREATLY on the year/make of the vehicle. If it is OBDI ('95 and
earlier) it will be a lot easier. Just a simple serial stream, you just have to
decode it. If it is a '95 or earlier GM, I can likely tell you how to
scan/datalog the PCM's parameters (20+ parameters), and reprogram nearly any
control parameters (probably around 70 tables/parameters). On my car (a '94
Z28) it is as easy as editing a few tables and uploading to the FLASH via a
serial port. I can change ANY parameter controlled by the PCM, fuel enrichment,
spark timing, as well as adjust the "learn" characteristics of the PCM to put
up with a much more efficient intake tract, or a super/turbocharger. On
automatic transmission vehicles, I can change shift points and even the line
pressure of the hydralic shift mechanism.

If your car is OBDII ('96 and later), it will be a little more difficult to talk
to the PCM (Powertrain Control Module). Instead of a simple serial stream at
around 8192 baud (that a 9600 baud serial port can talk to) you have things
like variable pulse width and varying baud rates for scanning/programming.

Like somebody else said, do a lot of searching on OBDI or OBDII, along with the
model of the vehicle. There is a LOT of info out there. E-mail me if you want.

Steve Ruse


Quoting Matthew Brush <matthewbrush@YAHOO.CA>:

> Thanks guys, that is EXACTLY what I was looking for.  Now I can get started
> with my research.
>
> Thanks again...Peace
>
> MJ Brush
>
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