5KSQ High Idle - Idle Stabilization Valves (ISV)

[Huw Powell]

> Someone wrote a few weeks ago that they had a high idle problem on their 5KT
> that was fixed by replacing the ISV.  That person stated that they knew the
> ISV was bad because it was easy to blow through it.  Others chimed in that
> their high idles problems were fixed by replacing ISVs that would not
> completely close.
>
> I don't believe that this is the test for ISVs.  I don't believe that an ISV
> for a 5KS (Don't know about the turbo.) closes completely.
>
> Any more opinions?

"some" ISV's rest position apparently is "closed" - two wire ones?
maybe.

"other" ISV's, eg the ones in n/a type 85/89 cars, have a rest position
about 1/4 open and flap open and shut when triggered.

the test would be more like running a few (5?) volts across the pins and
making sure they open &/or shut properly without sticking.

and that your harnesses are all well grounded, etc.

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/