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Date: Fri, 16 Jan 2004 19:46:08 GMT
From: Paul Halliday <pjghnopsamyonder.co.uk>
Subject: Re: Cold Weather Dependability


in article bu9049$f5fhh$1nopsam52899.news.uni-berlin.de, Grunff at grunffnopsam.com wrote on 16/01/2004 15:28: > GG wrote: > >> 8v > > This has the Bosch CIS. When the engine is cold, it uses an extra > injector (the coldstart injector, the one with the blue plug) to > introduce extra fuel. It knows when it's cold using the NTC temperature > sensor (under the inlet manifold somewhere IIRC - it's been a while > since I had an 8v). > > If [a] the injector is faulty, [b] the NTC is faulty, or [c] the wiring > between them has failed, you will have cold start and running problems. There are three main components - the cold start injector, the auxiliary air valve and the thermo time switch. All these have to (a) be working and (b) be working together. It gives you somewhere to start and the Haynes is pretty straightforward about how to test the system. The AAV failed on mine a few months ago giving me some serious headaches when cold starting. The cold start injector is fine so long as the AAV is working. It could well just be a little lean, which is another way of saying "fuelling issue" :) If you're going to blindly adjust the mixture, do it *very* gently. The mixture screw is very sensitive. You'll need a 3mm hex about 6 inches long to make adjustments. Best have a CO meter handy to read off the exhaust pipe otherwise. Good luck with that fine breed of Saab, Paul 1989 900 Turbo S http://saab.go.dyndns.org/

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