Re: TPI '165 pulling timing after Cold start

["Craig Marcho" <not_valid_email@airmail.net>]

I noticed the other day that my wire to the knock sensor had come off. I
plugged it back in, but I don't know how long this has been going on.... I'm
still using the '870 ECM and had never had a code the entire time. Does the
'870 not do the diagnostic thing on startup?

Craig M.

----- Original Message -----
From: "Gabe" <gellett@earthlink.net>
To: <gmecm@diy-efi.org>
Sent: Thursday, July 20, 2000 3:19 PM
Subject: Re: TPI '165 pulling timing after Cold start


> I'll reconnect it after work this afternoon and get back to the list with
the
> results....
>
> Does anyone know the application for APYN???  It was on the GMECM FTP...
>
> Thanks
> Gabe
>
> Bruce Plecan wrote:
>
> > > Will it set a code with just the knock sensor itself disconnected?
> >
> > Generally yes.
> >
> >  I thought
> > > the sensor inputted a frequency into the ESC which then conditioned it
and
> > fed
> > > it into the ECM.  I figured the lack of those frequencies would just
be
> > > interpreted as a lack of knock.
> >
> > NO
> > The ecm has self testing.
> > I will under a given set of circumstanes add a bunch of timing for just
a
> > moment, and then listen for knock, no knock set a check engine light.
> >
> > > The ESC module and all associated wiring are intack.  My theory was
> > (keeping in
> > > mind that I could not burn new calibrations at that time):  It was
losing
> > power
> > > between shifts, I wanted to see if the ECM was taking away advance
between
> > > shifts, it was.  I thought the disconnected knock sensor would be just
> > like a
> > > knock free engine to the ECM.  Last night I burnt a couple new chips
and
> > tried
> > > them out, didn't think to reconnect the knock sensor.  Was trying to
> > correct
> > > cold start (one thing at a time).....
> >
> > Thte thing to so is get all the oem stuff working right first, and then
try
> > to tune it.
> > Grumpy
> >
>
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