If only the instrument cluster lights have gone off maybe fault is at the
large white T14 connector cluster. There is a fuse for those lights but all
the dash lights are on that fuse.

So you unplugged the idle stabilizer valve but left the idle control unit
in front of the passenger side tail light connected?

The ICU connects to several circuits including the coolant temp II sensor
for ECU.

Neil.

On Sat, Dec 9, 2017 at 10:03 AM, Bruce Todd <beeceetee@gmail.com> wrote:

>
>

>  ....... This is a 1986 Digifant.
>
> Van starts - and idles at about 1000 rpm - all is good.  After about 5
> minutes under load (partial warm-up) rpm climb to 3000 rpm and then does
> not return to normal idle rpm.  The can fluctuate will from 3000 to 1000
> then back up to 3000 - however when driving, the van responds fine (doesn't
> hesitate or buck) just idles high when in neutral or when clutch is pushed
> in.
>
> So for now  - I have unplugged the idle stabilizer and the idle has come
> down to about 900 rpm and the van operates fairly normally other than
> requires a little more warm up time so it doesn't stall under load.  Idle
> stabilizer is vibrating as it should. Noticing the van runs really well
> when cold for about 10 minutes and then begins to hesitate a little when
> accelerating in first gear from a stop.  This issue has been on-going for
> awhile prior to the fluctuating rpm & unplugging the idle stabilizer.
>
> The other item is that my instrument cluster lights no longer come on -
> they were working intermittently but now have not come on for over 3
> weeks.  Any typical failure points?
>

--
Neil n

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