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Date: Fri, 30 Aug 2002 18:57:11 GMT
From: choupytnopsamAMnetscape.net (Choupyt)
Subject: Re: Why does it Sputter and Idle Rough after Rain Falls?


Paul Halliday wrote: >in article 3d6e8fb9.987710nopsam.optonline.net, Choupyt at >choupytnopsamAMnetscape.net wrote on 29/08/2002 22:18: > >> Lately, when or after it rains, my 1990 SAAB 900 sputters at start-up >> and will run normally only after warm-up (i.e., after the 1st 5 >> minutes or so of driving). >> >> It has been a while since I've had a full tune-up (i.e., change of >> spark plugs and associated wires, etc). Can someone please let me >> know what these symptoms are an indication of? > >A few questions first: >What is the behaviour of the idling? What RPM is the car running at? >Does the car splutter even when you are applying the accelerator, or does >"giving it some gas" ease the problem? >Is the problem from cold starts only, or is the problem more prevalent with >warm-starts? > Don't have exact RPM numbers, but the idling is rough and seems to be slower than normal. And yes, the car sputters even when I apply the accelerator, actually when this first occured, I thought there was water in the gas tank or something. This only occurs on a cold start after it rains for a while. And everything turns to normal once the car gets warmed up. >The simple one is possibly moisture in the distribution cap? The other week >when it was foggy for days in my area, my 1985 900i stalled (very unusually) >within the first five minutes of a cold start and would not start again >despite large amounts of swearing, pleading and threatening the scrap yard >:) > >I sprayed WD-40 across the back of the sparks and inside the dizzy cap. It >fired up fine then and ran okay thereafter. > >Are you sure your idling is okay - I sometimes have problems on my 1985 900i >where the idle will drop to around 500 RPM while the car is warming up. A >little holding on the accelerator was necessary to prevent it stalling. A >little tweak by my garage fixed this at service. This is where the air/fuel >mixture is running a bit weak. > Idling speed is otherwise normal for me. >The other problem I had was with repetitive stalls on my 1989 900 T. This >was a combination of (1, problems at warm-start) a hole in my petrol filter >(housed over the OSR wheel, rather than in the engine bay) and (2, problems >from a cold-start) my AIC valve had developed a leak - the car struggled a >bit until it had warmed up. > >To check this out, (1) Look for petrol on the road when you have come to >rest and (2) listen out for air leaks on the pipes between the throttle >intake and the crank-case. > >Hope this helps, > >Paul > >1985 900i 16V >1989 900 Turbo S >http://pjgh.go.dyndns.org/saab/index.html >

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