'165 manual trans idle behavior.

[Programmer]

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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