Date: Fri, 18 Aug 2006 09:49:04 -0600
From: CMM <>
Subject: Re: Last Chance for My '85 900

On 17 Aug 2006 16:41:59 -0700, "darthpup" <> wrote: >You need to buy a book on Bosch fuel injector system. I own an 85 >900S. It has over 250000 miles and still runs perfect. This is what I hear of Saabs. So, I hate to let mine go at only 167K. > I do all tune >ups myself. It is very important that there be no vacuum leaks >anywhere in the system. For instance if I fail to replace the oil >filler cap correctly it will allow excess air into the system and make >the engine run rough. Go over all the hoses carefully and make certain >that they all seal, especially the large hose from the cam box to the >intake plenum. You must plug any holes in intake air system if they >are not connected to some other device. I've gone over the vacuum lines several times. I found no leaks. There was a section that looked like it was close to cracking so I went ahead and replaced it. >The aux air is normally open and allow excess air into the intake to >make the engine idle fast until it warms up. The temp sensor >electrical resistance decreases with increasing coolant temperature and >makes the aux air close down, thereby slowing the idle. If this were the problem, wouldn't it run poorly until warmed up? Mine runs well for the first 45 seconds (or so) and then goes quickly downhill. >You need to get the warm up valve working also. I've had the elecrical portion of this disconnected for months and the car ran like a champ. I live in NM, USA, so winters are very mild. It doesn't make sense to me, but is there any way that removing its fuel line might have caused a problem? -- Christian

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