'165 manual trans idle behavior.

[Kevin Crain]

I'm noticing with my APYP code and 750 idle at coolant temp above 100degF
that it holds at ~1250rpm when coming to a halt, then goes to 750rpm after
a few sec of 0mph VSS input.  Kinda annoying, I'd like to see it go
straight to 750 immediately on halt, but just a slight nuisance.

-Kevin

On Sun, 17 Jun 2001, Programmer wrote:

> Yeah--read back through the schematics...no clutch switch input--sorry.
> There is--however--an idle learn strategy. Like Mark mentioned, I think
> part of the strategy is "0" VSS for idle. If there's any EMI down the line
> that feeds the computer a synthetic vss signal, it won't idle low.
> 
> Lyndon
> 
> ----- Original Message -----
> From: Kevin Crain <kevin at warpten.com>
> To: <gmecm at diy-efi.org>
> Sent: Saturday, June 16, 2001 7:08 PM
> Subject: '165 manual trans idle behavior.
> 
> 
> > The symptoms you describe are exactly what I see with the ARAP code, even
> > with the manual trans bit set to 1.  Haven't had time to get an ALDL scan
> > with the APYP ('89 Vette, 6-speed manual) code but the idle seemed to
> > follow the pedal more closely when coming to a stop.  I'll report back on
> > Monday...got a race to attend at Pocono on Sun.
> >
> > The '88 Firebird Helms manual shows no clutch switch input to the ECM,
> > period.  It has an input from the gear selector that closes to ground
> > whenever the shifter is in either P or N.  Given that this wire is now
> open
> > (heat shrink over the end, bundled neatly aside) my ECM never sees me in P
> > or N, and ALDL data confirms this.
> >
> > The only wiring to the clutch switch is the starter interlock, and it's
> > just the clutch "pedal in" switch in series with the starter solenoid
> > circuit.  Until that switch closes, you have no voltage to the starter sol
> > with the key in <START> position.
> >
> > -Kevin
> >
> > At 05:14 PM 6/16/01 -0700, you wrote:
> > >So, what pin was it?  What code are you running?
> > >I have a friend who runs 89 auto code in his 88 Firebird
> > >that he put a 6 speed in.  350 tpi. His idle hangs until
> > >he comes to a stop and waits.
> > >Any ideas?
> > >Thanks.
> > >Mark
> > >----- Original Message -----
> > >From: "Kevin Crain" <kevin at warpten.com>
> > >To: <gmecm at diy-efi.org>
> > >Sent: Saturday, June 16, 2001 9:24 AM
> > >Subject: Re: Fwd: Back from brazil and pistons
> > >
> > >
> > >> At 08:50 AM 6/16/01 -0600, you wrote:
> > >> >Are you giving the PCM a clutch switch signal ?
> > >> >It may stall on you with the vette 6 speed bin...
> > >> >
> > >>
> > >> Hmmm.  No, I'm not sending a clutch switch signal.  There are two
> switches
> > >> on the '95 Firebird pedal set...one that closes when the clutch pedal
> is
> > >> out and another that closes when the pedal's in.  Guess it's time to
> haul
> > >> out the Helms and see which pin(s) the '165 ECM wants to see which
> signal
> > >on.
> > >>
> > >> No stalling issue, no SES light, and the idle returns to 750 much more
> > >> quickly now when stopping.
> > >>
> > >> -Kevin
> > >>
> > >> -Kevin
> >
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> > >
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