Date: Thu, 15 May 2003 18:29:37 GMT From: Paul Halliday <pjghnopsamyonder.co.uk> Subject: Auxiliary Air Valve Questions
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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