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Re: ECM #



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@bright.net>
Reply-To: gmecm@diy-efi.org
To: <gmecm@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@grolen.com>
> >Reply-To: gmecm@diy-efi.org
> >To: gmecm@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 16133288, IIRC, a newer version of the '747,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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>
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