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Re: TPI '165 pulling timing after Cold start



Yeah, the 2 second FP occurs in the absence of oil pressure. Don't know about
the code yet...--JB

"Marteney, Steven J." wrote:

> Knock sensor has a certain impedance the ECM can detect (4.7kohm?).  When
> not connected, it won't find that and should set a code.  Does the ECM
> remove timing if the knock sensor isn't detected?  I would think it would,
> but have no knowledge.
>
> What are you doing to adjust cold-start?  My 89 165-based (soon to be
> 730!!!!!) 350 TPI has a terrible time starting when cold.  Acts like not
> enough fuel.  I have played with the PW correction vs. battery voltage in
> Tunercat and can make it much worse on hot and cold starts by lessening the
> PW.  Increasing the PW (so far) has had little effect.  Doesn't seem like an
> air problem either.  Doesn't matter whether my foot's on or off the gas.
>
> Anyone know if the 165 ECM controls the 2 second fuel pump enable when no
> oil pressure is present?  where that may be in the code?
>
> Steve (pulling 730 this weekend 8^)  <-- note: grin bigger than Texas)
>
> -----Original Message-----
> From: Gabe [mailto:gellett@earthlink.net]
> Sent: Thursday, July 20, 2000 1:42 PM
> To: gmecm@diy-efi.org
> Subject: Re: TPI '165 pulling timing after Cold start
>
> Will it set a code with just the knock sensor itself disconnected?  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.
>
> 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).....
>
> Thanks
> Gabe
>
> Bruce Plecan wrote:
>
> > Before even trying to diagnose the system you should have it close to
> right.
> > Unless you have the flag disabled for the ESC test you need to figure out
> > why it's not setting a code.
> > Grumpy
> >
> > > Why does my '165 seem to pull about 15~20 deg of timing out after cold
> > start and
> > > leave it out until I am running up the road a ways?  I have tried a few
> > > different stock calibrations, namely ARAP, APYP, and APYN - I believe
> all
> > those
> > > are '89 code.
> > >
> > > BTW, can anyone tell me the application for APYN - I have been looking
> for
> > a
> > > downloadable '89 305 auto, code to start with (I just got my EPROM
> eraser,
> > so
> > > let the games begin!)
> > >
> > > Anyway....  This removal of timing causes some nasty derivability
> problems
> > when
> > > cold (as well as a nasty exhaust rasp) and I can't seem to get rid of
> it.
> > I
> > > haven't figured out the exact event that is causing the timing to go
> back
> > in
> > > when it does (maybe CL?), for obvious reasons, this event is hard to
> > catch.
> > >
> > > Right now I have the knock sensor disconnected, and the ECM is setting
> no
> > codes
> > > of any kind.
> > >
> > > Thanks
> > > Gabe
> > >
> > >
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