At 12:02 AM 1/10/2002, Blake Thornton wrote:
> > however, cold starts are a pain, because the Idle Stabilizer Valve
> (ISV) keeps
>
>I haven't noticed cold start problems with the idle stabilizer
>disconnected yet (and its been cold).
>
>And, that makes me wonder about your terminology.  When you say valve, I
>think of a mechanical valve opening and closing - like the auxilary air
>valve -- it opens and closes to let more or less air in the engine.  But,
>when I say idle stabilizer, I'm thinking of the little green box on the
>left side of my van with two funny shaped plugs that I can connect
>together.

The 2.1l engines have a solenoid-operated idle-stabilizer valve with an
associated control board -- it bleeds air past the throttle plate.

The 1.9l engines have a completely electronic circuit that adjusts timing
on-the-fly at low rpm -- with a properly operating idle stabilizer you
should see the timing bouncing all around at idle, which is why you have to
disconnect it to set the timing.  If your engine runs better without it
than with it, strongly suspect it's bad.

Re your other post, it has no idea whether the throttle switch is closed or
not, it's connected between the Hall generator at the distributor and the
ignition module on the firewall.  All it sees is rpm.

> > the engine idling at 1000 rpm when cold. The operation of the valve is
> related
> > to the signal from the Temp II sensor to the ECU. Cold, the ECU circuit
>
>So bypassing idle stabilizer cuts off the signal from the TempII sensor as
>well?  Interesting, and that would explain the difficult cold starts.

That's strictly related to the 2.1l system.

david

--
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"