Re: Mods to '85 GM TPI ECM

["Jim and Sharon Brady" <bradyiii@shore.intercom.net>]

Shannen,
    What kind of scantool?  I have a Sunpro which seems to do nothing more
than short A & B for trouble codes.  I would like to have a laptop interface
to read the diagnostic information from the ECM.  What type of scantool do
you recommend?  Do you think I'm being a little too ambitious about jumping
into a laptop interface?

Jim Brady
'87 Monte SS 383 TPI 6 speed

>
> If you don't have a good scantool, it's a good idea to get one.  I've
> seen them for sale at Sears for cheap $$.  The scantool will allow you
> to read diagnostic information from the ecm.  To read the eprom you'll
> need an eprom burner, several are available from web sources.  To burn
> new chips, you'll also need an eprom eraser.
>
> Manipulating data, the heart of the issue.  To determine what can be
> changed, you'll need to know what year ecm you have.  There's bunches
> of info about the 86-89 TPI ecm, and also about the 90-91 MAP based
> ECM.  I've seen little on the web about the 85 model. : (  You might
> consider changing ecm's if it turns out that you do have an 85 model.
> The easiest way to make changes is with specially written software,
> which can interpret the data from the chip and present it in more
> human numbers.  There is some free stuff for 86-91 tpi's which isn't
> too bad.  You can also purchase software, but you'll need to know what
> year/bcc you have.  Again, lots of people are working with the 86-89
> and 90-91 tpi ecm's, so using one of those computers will allow the
> "been there done that" guys to help you in a jam.
>
> Generally, the error codes can be turned on/off, fuel parameters can
> be changed, and timing tables can be manipulated.  There's more, but
> for "get your feet wet" tuning, it's easy to change too many things
> too fast, and end up with big problems.  Some required reading:
> ftp://diy-efi.org/incoming/TuneTip1.txt
> ftp://diy-efi.org/incoming/GM_ECMArchives.zip
> ftp://diy-efi.org/incoming/DIY_EFIArchives.zip
>
> The DIY... archives are loaded with info, waaay too much to absorb on
> the first two or three readings.  Look for programming 101 for a
> heading, for a start.  TuneTip1 is a good guideline for chip tuning,
> and the ECM archives will have some info in various places.
>
> Didja get enough to start with? : )
> Shannen
>
>
> Jim and Sharon Brady wrote:
> >
> > Hi, my name is Jim Brady and I just joined the list a few moments ago.
My
> > current project is my '87 Monte SS.  My Monte is equipped with the GM
> > TPI(Tuned Port Injection) system consists of an '85 computer(I assume I
have
> > an '85 computer because it had a Bosch MAF burn-off box attached to it)
with
> > '87 hardware.  My original motor was a 305 and the system worked
perfect.
> > My new setup is a 383(stroked 350) with a T56 manual trans.  The only
> > changes I have made to the system since I upgraded from the 305 to the
383
> > is 24lb/hr injectors and a fuel pressure regulator.  Everything works
great
> > except full throttle.  I understand full throttle switches the ECM to
open
> > loop mode leaving the EPROM to feed the system pre-determined values.
Aside
> > from improving my full throttle condition I would like to monitor the
> > parameters of the running motor.  What do I need to approach this
project?
> > I assume an EPROM burner, cable for the aldl connector and software.
What
> > can I manipulate with the software?  How about the EPROM.  I am new to
this
> > and would appreciate any help you can give on this matter.  Thanks.
> >
> > Jim Brady
> > '87 Monte SS 383 TPI 6 speed
> >
>
> --------------------------------------------------------------------------
--
> > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> > in the body of a message (not the subject) to
majordomo@lists.diy-efi.org
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo@lists.diy-efi.org
>
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org