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
> >
>