Re: Mods to '85 GM TPI ECM

["Bruce Plecan" <nacelp@bright.net>]

Hunt around, drop by some GM stores, and independent shops, just every once
inna while there are some laying around.  Several years ago I found a couple
OTCs, for $25 each, however they stopped at MY89.  My car used an 87
confuser, so for $25 I was in fat city.

You can always barter, and hunt around on the net.  Lots of guys give up,
and give the stuff away in frustration, I missed a Diacom-P by minutes, that
a guy dumped for $200...
grumpy


> 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
>

----------------------------------------------------------------------------
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