Idle too high. How do I adjust

[rr]

I would be tempted to add a switch to the throttle that activated
a 555 at ~50Hz to simulate a VSS. Just have it off at idle setting
and on shortly above that. Should be enough to get the IAC to
cooperate.

BobR.


ZZZ Temp-Gold wrote:

> I disabled the IAC. Yes it does idle @ 500, but now has trouble starting. It
> doesn't seem to make a difference where I set the idle, the starting problem
> remains w/o the IAC. Is it conceivable to use some type of relay to toggle
> on IAC when starting?  (With the IAC, it starts immediately, and idles up
> for a couple seconds then back down again. This is where, I think it would
> be nice to disable it.) Any ideas?
>
> The schematic at http://www.diy-efi.org/gmecm/ecm_info/1227747/747ecm1.jpg.
> indicates that high gear sensor is on pin C7. My ecu has no wire there.
> Also, the schematic indicates that park neutral sensor is active on ground.
> Unless, Im not interpreting it correctly.
>
> g
>
> > ----------
> > From:         Gregory A. Parmer[SMTP:gparmer at acesag.auburn.edu]
> > Reply To:     gmecm at diy-efi.org
> > Sent:         Wednesday, September 05, 2001 10:04 PM
> > To:   'gmecm at diy-efi.org'
> > Subject:      RE: Idle too high. How do I adjust
> >
> >
> > > so, I do not have it connected to anything. Are you thinking this
> > effects
> > > upper rpm or idle? I dont have the gear selector connected either. Isnt
> > this
> > > a neutral/park indicator? Could the VSS limit the rpm to 4200?
> >
> > No VSS=Idle trouble, mostly. Wouldn't think VSS would limit RPM, but I
> > would try switching the neutral/park pin briefly to see if that had an
> > effect. If you set it to "Drive" and there's no VSS it'll set a code
> > eventually, but it'd be a worthwhile test on the 4200 RPM question.
> >
> > Disabling IAC completely isn't such a bad option probably, for a
> > boat...tho a RNDL switch helping to control idle would make a nice touch.
> >
> > -greg
> >
> > --------------------------------------------------------------------------

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