More data on the idle floating when the A/C signal is on to the green and
white "step up the idle" wire.

Today, for one short period of time, the idle was down where it should be
with the A/C on.

So, how does the Idle Stabilier work?  Why would it float the idle with this
signal, instead of just kicking it up a bit?

Should I just replace the Stabilizer and see if that does it?

Kim
----- Original Message -----
From: "Kim Springer" <kimspringer@RCN.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, September 09, 2007 10:12 PM
Subject: Step up the idle

> Thanks Mark for helping me find the white-green wire for stepping up the
> idle with the AC on.
>
> I connected it yesterday and it worked, but too well.
>
> The idle float and varied around 2K RPM.  It acts like there is a vacuum
> leak, but the engine idles perfectly without the AC signal to ICU.
>
> Does anyone have any idea what's at fault.
>
> Thanks in advance,
>
> Kim
>
> ----- Original Message -----
> From: "Mark Drillock" <drillock@EARTHLINK.NET>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Tuesday, August 21, 2007 8:54 AM
> Subject: Re: Step up the idle
>
>
> > The signal wires from the A/C and power steering don't connect to the
> > ECU. They do connect to the Idle Control Unit. The wires are in the FI
> > harness whether needed or not, at least on the USA models I have seen.
> > The wire needed for the A/C Compressor On signal is a single white/green
> > stripe wire with plastic connector that sticks out of the main FI wiring
> > bundle near the ignition coil area.
> >
> > Good luck with the Bentley diagrams for this wire. Not shown fully and
> > what is shown is misleading. Look at the FI diagram for the ICU and you
> > can see an unused wire coming from pin 2, white/green. Look at the A/C
> > diagram and see a wire from the compressor clutch labeled "to idle
> > stabilizer control unit" but wire color shown is red/blue and no mention
> > of exactly where it goes. These two get connected for the A/C signal to
> ICU.
> >
> > Mark
> >
> > BenT Syncro wrote:
> >
> > > On 8/20/07, Kim Springer <kimspringer@rcn.com> wrote:
> > >
> > >>I recently got the AC runnig in my truck and think I need to step up
the
> > >>idle for the extra load of the AC compressor.  The engine has stalled
a
> few
> > >>times and the rpm takes too long to stabilize off revs.
> > >>
> > >>I haven't looked at the Bently wiring diagrams, but I would guess that
> > >>there is a contact on the Idle Control Relay to do this.  I would also
> guess
> > >>that it's just a matter of running an extension from the clutch wire
to
> the
> > >>relay.
> > >>
> > >>Anyone done this?
> > >>
> > >>Thanks,
> > >>
> > >>Kim
> > >>88 Tristar #7
> > >
> > >
> > >
> > >
> > > Not sure what engine management system you have but I thought the
> Digifant
> > > ECU did all the idle compensatiing for the AC and PS. True or false?
> > >
> > >
> > > BenT
> > >
> >
>