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Date: 4 Dec 2002 21:10:56 -0700
From: andrewunix <agreenbunopsamnet>
Subject: Re: 1995 NG 900S 2.3NA AT - Idle hunting
Thanks for the input. One peculiarity is that the idle only seems to hunt
after the car has warmed up a bit (idle is still on the low side when
it's cold, though). Any thoughts as to why this would be the case?
Tue, 3 Dec 2002 13:15:41 -0500, LEGUENnopsamORLD.NET suggested:
: Hello Andrew,
: I am sorry I do not have a good answer for you ,but have two Saabs that do
: the same thing. On my 89 9000 2.0 na I did every thing you did and it did
: not get any better, the only thing that helped some was that on the carbon
: canister is a electric valve powered from the fuel pump relay. the valve was
: always ticking, which open and closes loosing vacuum from the intake. The
: ground wire is tied to the ECU. It would loose or open it ground. I never
: could find out why, so I cut the wire and ran it to a ground. It help the
: idle some, the valve would stay closed will running and open when the fuel
: pump was not running. I not telling you to do that, and maybe someone can
: answer why it opens and closes so much. But on my 94 9000 cse 2.3 turbo it
: started to do the same thing. But on it I found a small fuel leak, well
: maybe just moisture on the joint on the return line near the firewall a foot
: after the fuel pressure regulator, where it goes from rubber to plastic
: there is a clamp I tighten, it seems to idle better not 100% and also
: respond better.
: Good Luck,
: Jean Paul
: "andrewunix" <agreenbunopsamnet> wrote in message
: news:slrnaupkof.q0d.agreenbunopsam.nyx.net...
:> This one's still got me scratching my head.
:>
:> The car runs fine for the most part, but the idle hunts, particularly in
:> cold weather or with the A/C running.
:>
:> I can't find any vacuum leaks.
:>
:> I've tried swapping out: Idle Control valve, distributor, spark plug
:> wires, oxygen sensor, and even the engine management computer (bosch
:> motronic).
:>
:> Nothing seems to help with this particular problem.
:>
:> The overall idle seems a little low, which I would think would indicate a
:> vacuum leak somewhere, but I've replaced all of the vacuum hose in the car
:> with no results.
:>
:> Car is an automatic, and it surges pretty badly when first put into Drive
:> or Reverse.
:>
:> Sometimes when I'm driving I smell fuel coming through the ventilation
:> system.
:>
:> Gas mileage in city conditions is pretty poor (16-18 mpg).
:>
:> Any ideas?
--
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