Netres availability

[Shannen Durphey]

What is your base timing value in the 7747 .bin?  What is the base timing of the
distributor?  Are you using an adjustable type timing light or a fixed type
timing light?

Shannen

Dan Griffin wrote:
> 
> After Zeroing knock tables, truck runs better than it ever has since I began
> this project.. And no more backfiring...Although am still getting sluggish
> accelleration, and code 45 but less herky jerky feel than before... After
> setting timing to spec. with '165 plugged in, There is definatly a
> diffrence, with '747 in, I cant find the mark at all....If I can find a
> couple used distributors cheap, Ill do some experimenting...As far as
> netres, it looks like the one from the '6867 is gonna work for now... thanks
> for all the help guys....
> Dan
> ----- Original Message -----
> From: Ludis Langens <ludis at cruzers.com>
> To: <gmecm at diy-efi.org>
> Sent: Monday, August 13, 2001 12:39 PM
> Subject: Re: Netres availability
> 
> > Shannen Durphey wrote:
> > >
> > > I posted a list of ecms used with the 2.5 tbi engines.
> >
> > The problem is that not a one of them uses a removeable netres/CALPAK
> > that could be plugged into a 1227747.
> >
> > > ECM/PCM: ECM #01225570
> > > ECM/PCM: ECM #01225610
> > > ECM/PCM: ECM #01226100
> > > ECM/PCM: ECM #01226156
> > > ECM/PCM: ECM #01226864
> >
> > The above five are hardwired for the 2.5 (and 1.8).  (BTW, I have mask
> > ROM dumps of all of these.)
> >
> > > ECM/PCM: ECM #01227165
> > > ECM/PCM: ECM #01227727
> > > ECM/PCM: ECM #01227748
> >
> > The above three use a MEMCAL which includes a netres along with the EPROM.
> >
> >
> > Just about the only netres option for this application is the netres
> > from a 1226867 (which runs a 2.0).  The '6867 is a single injector TBI
> > ECM - sort of the single injector version of the '7747.  Note that the
> > '7165 replaced the '6867 in some vehicles.
> >
> > As long as you stay out of limp mode, a '7747 netres has three resistors
> > of interest.  One announces to the CPU that the netres is plugged in.
> > One announces to the limp home chip that the netres is plugged in.  And
> > the third one switches the injector hardware between firing both
> > injector outputs together, or firing them seperately.  Note that
> > software also has to reprogram hardware to properly change the injector
> > firing.  I don't know of the '6867 netres has this same pinout or not.
> >
> > --
> > Ludis Langens
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