'165 manual trans idle behavior.

[rr]

This behaviour is not all that unusual. What happens is that after a cold
start the engine may need an IAC count of 110 to keep a reasonable
idle. You then pull out and drive for a few minutes before again coming
to a stop.

Now the engine has warmed up a bit & only needs an IAC count of
65 to idle. However, upon stopping the IAC goes to 110 first. It will
then adjust downward until a proper idle speed is obtained. Another
part of the idle control is that typically there isn't any until the vehicle
is at a full stop. Just a slight rolling forward is enough to prevent
idle control.

The code actually checks for 0 mph before allowing idle control. On
top of that, until the engine is fully warmed up there is only a lower &
upper limit to idle speed, no actual control of a particular set idle speed.

BobR.

Kevin Crain wrote:

> 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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