ECM #

[Wayne Johnson]

Leaded fuel??
It has O2 sensor and goes closed loop above idle. On Diacom shows O2 cross 
counts and swings back and forth between high and low O2 voltage when in 
closed loop.
Does the O2 sensor hold up very well with leaded fuel? Does it use a 
"special" O2 sensor?

>From: "nacelp" <nacelp at bright.net>
>Reply-To: gmecm at diy-efi.org
>To: <gmecm at diy-efi.org>
>Subject: Re: ECM #
>Date: Mon, 1 May 2000 11:52:03 -0400
>
>
>It's one of the leaded fuel chips
>89  454  1227747
>-NM8
>Grumpy
>
>
> > This got me to thinking, my neighbor has a big block (454) rollback that
>has
> > a 747, but I didn't pay attention to the rest of the numbers. The thing 
>is
> > it does not have a knock sensor. No wire in connector, so it appears 
>that
>it
> > never had a knock sensor. I read the bin and the knock tables are zeroed
> > out. It also idles in open loop. I think the bin is anty, have a copy of
>it
> > at home.
> >
> >
> > >From: Shannen Durphey <shannen at grolen.com>
> > >Reply-To: gmecm at diy-efi.org
> > >To: gmecm at diy-efi.org
> > >Subject: Re: ECM  #
> > >Date: Mon, 01 May 2000 00:00:41 -0400
> > >
> > >Hello, rr.
> > >The 1228747 is typically used in a big block chebby truck, and I've
> > >seen it used with large gvw smallblock equipped trucks.  It's not the
> > >same as the 7747, but I can't tell you what the differences are.
> > >Shannen
> > >
> > >rr wrote:
> > > >
> > > > I do believe it is Bruce. I've been holding onto
> > > > four numbers for the '747 (for boneyard hunting):
> > > >
> > > > 1227747    the original
> > > > 1228747    (Not sure about this one)
> > > > 16121154 new service number?
> > > > and
> > > > 16133288, IIRC, a newer version of the '747,
> > > >  possibly a different board inside, but functionally
> > > >  the same.
> > > >
> > > > BobR.
> > > >
> >
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