[Shotimes] Re: Idle Speed Controller Question

[Leigh Smith]

Carl;
Also check to see if the AC compressor may be failing / binding up.
My 89 had an idle problem for 2 years that even a new ISC wouldn't help.
Sporadic unstable idle / even to the point of stalling.
Until the compressor blew and a new one fixed the idle problem.
Just turn the climate control head to OFF and see if the problem goes away.
An ECM self-test should identify a sticking ISC, but not a compressor.
Lee
----- Original Message ----- 
From: "Carl Prochilo" <gr8sho@prochilo.myserver.org>
To: <shotimes@autox.team.net>; <TechSHO@topica.com>
Sent: Monday, January 17, 2005 12:42 PM
Subject: Re: [Shotimes] Re: Idle Speed Controller Question


> Yes, IAB.  I was looking at Autozone website at the time.  Seems to have a
> lot of different names.
>
> My car seems to struggle now to hold a steady idle.  It has been
> developing slowly over that past few months but not to the point of
> stalling (yet).  At this point the idle will drop down to 600 momentarily
> before it bops up, and the low oil pressure light will come on.  Part of
> the problem was masked by the LPM since it bumps the idle up slightly, and
> now I've removed the LPM from the PCM.
>
> I was hoping cleaning the intake would cure the problem, but in fact I
> neglected to clean the IAB while I had it off.  Is it just a matter of
> pulling the part and spraying Berryman's in there?  I already know that
> the lower screw is going to be a problem, so I may just pull the intake
> off again to do it.
> -- 
> Cheers,
> Carl Prochilo
> 92 Ultra Red Crimson
>
> On Mon, January 17, 2005 10:21 am, Donald Mallinson said:
> > Carl,
> >
> > You mean the Idle Air Bypass valve (IAB)?  I think that is
> > what it usually is called.
> >
> > Symptoms are the car dies when you come to a stop and put in
> > the clutch, especially after a highway run, like an exit
> > ramp with a stop sign.
> >
> > ATX cars can develope a nasty rattling sound although the
> > car will still idle, but not well.  Open the air cleaner and
> > the rattle will be LOUD and that is usually the IAB.
> >
> > It can be cleaned with good results, certainly Performance
> > Plus has been cleaning them on MTX cars since 1992 or so
> > with good results.  Takes a few minutes, and if it doesn't
> > work, then they replace it.
> >
> > I think the one on the ATX cars is different and usually it
> > gets replaced.
> >
> > Don Mallinson
> >
> > Carl Prochilo wrote:
> >> What are the symptoms of a failing ISC?
> >>
> >> Also, cleaning of the ISC is usually not considered to be effective,
but
> >> the part is cheap enough to just replace.  True?
> >>
> >> The ISC in question is from said 92 and is original (214K miles).
> >> ====
> >> Cheers,
> >> Carl Prochilo
> >> 1992 Ultra Red Crimson
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