Date: 17 Aug 2006 16:41:59 -0700 From: "darthpup" <amchitkanospamexcite.com> Subject: Re: Last Chance for My '85 900
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. 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. 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. You need to get the warm up valve working also.