Date: Mon, 26 Jul 1999 21:59:59 GMT
From: strat0XXXXnopsam.com (Scott A. Stratmoen)
Subject: Re: Understanding Turbo/APC


In article <7ni3f4$5hr$1nopsamreader2.core.theplanet.net>, usernopsamsoftnet.co.uk says... Given that past solutions posted to this news group did not solve my 900 turbo problem.... You will need to check a number of items: 1) Replace all vacuum hoses you can get to. This includes the hose which feeds the boost gauge in the dash board. 2) Check that the intake is clear of any dead animals ;-). Change the air cleaner. 3) Check the APC solenoid mounted over the radiator. 4) Check the turbo bypass valve and associated hose clamps. (Note that this is a very likely problem area.) 5) Check for excessive back pressure (I.e. is oil coming out of the engine where it shouldn't). This could indicate a blocked exhaust system. 6) Spin the turbo impeller by hand and make sure it is not binding. 7) Check the waste gate solenoid. I would say the waste gate itself but gack! 8) Finally when you have check everything else and there is no mechanical reason it's time for the APC computer. What happens on old SAABs is that the APC analog components change over time. This causes the maximum boost setting to change. To resolve the problem pull the computer and break the seal. Give pot P a twist and test the car. Tune for proper boost. You will need to reseal the pot with paint or the like otherwise vibration will cause the setting to change. I may have forgotten something else to look at but I'm sure others will help out on this matter. > I have recently got a 16v 900 Turbo. This is my first Turbo charged car and > I'm not show if its working properly or not. The car has a high mileage 150K > . I can't seem to get the turbo boost more than about half way on the gauge > and if I put my foot down the boost goes down. I know the APC protects the > turbo. Is this normal . > > The 8v turbo I drove felt quicker and the boost would flick across to just > below the red. > > > Any ideas > > > Andy > > >

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