[Gmecm] Re: Closed loop and stalling

[Rick McLeod]

yes, jump a-b then key-on-engine-off and you're in
diag, and when I set up TPS, I use factory spec from
manufacturer
most of them are right around 0.55Volt +/- .05Volt as
I recall, but always check.

tidbit, the IAC on most cars is a stepper motor,
meaning it needs pulses from the ECM to move, so if
the ECM isn't running it won't move, ie pulling the
fuse to the ECM won't do it. Also, there are some
startup specs on some cars for the installation of the
pintle as far as preset depth, etc. I've always on the
GM's just used the ECM process, though.

HTH, good luck
--- Frank McCracken <frankmccracken at shaw.ca> wrote:
> Rick;
> Your suggestion to put it into diagnostic mode, is
> to jump A and B? And then
> continue with procedure?
> What do you set tps voltage at? I have conflcting
> voltage settings.
> 747 ecm, 400sb, Holley tbi, manual shift.
> Frank.
> 
> 
> 
> ----- Original Message -----
> From: "Rick McLeod" <dunvegan at sbcglobal.net>
> To: <gmecm at diy-efi.org>
> Sent: Wednesday, May 25, 2005 9:57 AM
> Subject: Re: [Gmecm] Re: Closed loop and stalling
> 
> 
> > Most have a code that when in diag mode, they
> extend
> > the pintle, so I place in that mode, wait, then
> remove
> > connector, and then remove diag mode, start car,
> > adjust idle to just below spec, restart after
> > reconnecting IAC, and all is good. Works great on
> my
> > TPI cars, and I also set TPS at the same time to
> make
> > sure all is good, always get good off-idle resonse
> w/
> > this procedure.
> >
> >
> > --- Cowen <captain_krill at yahoo.com> wrote:
> > > Oops.  When I described setting the idle stop
> screw
> > > for proper idle, I forgot one step - actually I
> > > still
> > > forget it!  If I recall, before you begin, I
> believe
> > > you have to pull the ECM fuse.  If you don't
> pull
> > > the
> > > fuse, when you switch the ignition ON, the IAC
> will
> > > extend the pintle (as you want) but then pull it
> > > back
> > > again to the "start" position.
> > > Pulling the ECM fuse forces the IAC to extend
> the
> > > pintle fully, allowing you to set the idle with
> the
> > > throttle plate only.  The IAC will have minimal
> > > adjusting to do after that.  Be sure to replace
> the
> > > fuse before starting the engine.  Sorry about
> the
> > > omission!
> > >
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