ICV/ISV

[Ameer Antar]

ISV is a good place to start, but this could be a vac. leak of some 
sort...in hoses, intake, even worn bushes in the throttle body. Maybe it's 
an issue w/ the over-run valve on manual tranny's. It could be turning on 
due to bad wiring or just a sticky valve. Somehow it seems air is getting 
into the engine w/o the control of the throttle valve. Intake hoses and 
such need very careful examination, b/c the leaks/cracks usually occur 
where you can't see them and many times under the hose clamps. I think a 
very close inspection of the whole engine should turn up something, even if 
it's not an intermittent leak.

My car had intermittent idle issues due to a cracked intake hose on the 
turbo that would seal and loosen as I was driving...good luck...you'll need it.

-ameer


At 12:50 PM 11/15/2000 , you wrote:
>Mark,
>My '86 CGT exhibits the same poor idle. I also have pulled, cleaned and even
>swapped my ISV for another unit to no avail. But I noticed as you have that
>the idle does not change at all if the electrical plug to the ISV is
>removed. If anyone comes up with an answer and does not post it to the List,
>would you please forward it to me? Thanks.
>
>Craig
>'92 100S (90k)
>'86 CGT (193k)
>
>----- Original Message -----
>From: "Mark E. Johnson" <mej at mejphoto.com>
>To: "quattro list" <quattro at audifans.com>
>Sent: Wednesday, November 15, 2000 10:24 AM
>Subject: Re: ICV/ISV
>
>
> > Hi folks -
> >
> > Several people suggested that I try pulling the plug on the ICV/ISV on my
>86
> > 4kq to see if that was the problem. Well, I pulled the plug and it made no
> > difference in the idle, still bouncing between 1500 and 1800, then soaring
> > up to 4000.
> >
> > Seems to me that if it was working, pulling the plug on it would make some
> > sort of difference. Is my thinking correct or have I wandered off in the
> > wrong direction on this?
> >
> > -mej
> >
> >
> > Mark E. Johnson /
> >                / Photojournalist
> >
> > Medway, Massachusetts
> >
> > Office: 508-533-1562
> > Email: mej at mejphoto                     Images available through:
> > http://www.mejphoto.com                http://www.picturedesk.org
> >
> >
> >
> >
> >
> >