Date: Fri, 16 May 2003 00:28:59 +0200 From: "Johan Beikes" <j.beikesnopsamdoo.nl> Subject: Re: Auxiliary Air Valve Questions
Hi Paul, From your decription of the auxiliary air valve, it should be fine, but make sure it is completely closed after 5 - 8 minutes warming up. I would certainly take a look at the thermo time switch (mounted in front of the thermostat housing). Depending of engine temp, this device controls the number of seconds that the cold start injector will be activated. If defective (short circuit) you may be suffering from flooding the engine. That would explain why the car fires up nicely after 12+ hrs of cooling down, but not after 5 -6 hrs (and less probably). Try to start the car with disconnected time switch, when the engine has not yet cooled down completely and see if there is any difference. Johan 900 T8 '87 "Paul Halliday" <pjghnopsamyonder.co.uk> wrote in message news:BAE99A8A.6332%pjghnopsamyonder.co.uk... > Hi guys & gals, > > The car in question is an '89 900 T8. I have been having some cold start > problems recently - it fires up fine, but after a couple of hundred yards if > I drop the clutch, it would often stall. This annoyance would often continue > until the car had warmed up (or at least reached about a third of the way up > the water temp gauge). > > As a first trial, I removed the dump valve, which is attached to the > throttle housing (I have a 16V throttle housing) in the normal postition. > This made no difference. I then moved the throttle dash-pot a little closer > to the throttle (ensuring the throttle plate still closed) and gave the > throttle plate a damn good clean out with carb cleaner. > > This has really sorted the problem out very nicely from cold starts (after > the car has been left for a good 12+ hours). > > If I use the car after it has cooled down (say 5-6 hours), but not overnight > it is a little difficult to fire up. Flooring the accelerator pedal on the > second go seems to be the only way if it doesn't fire up within 10 seconds. > My injectors are ignition electrics are all fine, so I looked into the > auxiliary air valve and gave it a good clean out with carb cleaner and > noticed a small hole that I could see through. > > The Haynes manual says that this valve should have an oval hole that should > close when the car warms up. This hole is oval (about 1-2mm long and 0.5-1mm > wide) from the top, but looks a little mis-shaped on the underside. Is this > the oval hole I should be seeing, or is it a corroded hole that means the > valve should be replaced? > > After cleaning the valve, I went for a short drive this evening and it felt > a lot better. Would problems with this valve in give the kind of behaviour > described above? How do I check the valve for correct operation? The Haynes > is a little light on detail, so I presume it is obvious what should happen > in there, but I'm still not sure what I'm looking for. > > Any help would be very much appreciated. TIA. > > Paul > > 1989 900 Turbo S > http://saab.go.dyndns.org/ >
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