Date: Wed, 09 Sep 1998 23:02:28 GMT From: Ywan Mason <ymasonnopsamsouth.net> Subject: Re: Help - fast idle on '87 9000 Turbo
Try http://www.townsendimports.com/tuneup_folder/adj_basic_idle_lh2.1.html for setting the base idle. This is a revised edition of the Saabnet.com FAQ. More than likely the problem with the cold start hunting is an air mass meter. No checks on it will conclusively pin point its trouble. Before you condemn it though, you have to make sure every other base is covered. This includes making sure all tune up parts are current and good. All have a maximum recommended service limit of 30K miles. They include the fuel filter, air filter, plugs, distributor cap and rotor. You should remove the throttle housing bellows and clean around the plate while holding it open with carb cleaner and a toothbrush. Remove the AIC valve and clean its shutter wheel as well. Deposits here can cause the wheel to bind and burn out the valve's motor. Make sure there are no vacuum leaks, check all the vacuum lines to the intake and make sure each one holds vacuum. If not, trace out the leak and remedy it. Then see http://www.townsendimports.com/tuneup_folder/amm.htm The cold start hunting/stalling problems are best repaired by a process of elimination. There is the possibility that multiple problems are contributing to the problem. The high idle could be caused by the AIC valve being dirty and binding or burnt out from long time binding. The electrical connections at the valve, throttle switch, or air mass meter could be corroded or loose. The grounds at the intake for the LH system could suffer in the same way. Never overlook fuel pressure when diagnosing a running problem. Test it for volume, operating pressure, high limit pressure and rest pressure. Make sure the ignition timing is set correctly. Good Luck
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