Date: Sat, 31 Jul 1999 23:03:34 +0100 From: "rick.jones" <rick.jonesnopsamonline.co.uk> Subject: Re: Understanding Turbo/APC
hi following on from the point below ... > >3) Check the APC solenoid mounted over the radiator. I'd done some work on my 8 valve and afterwards noticed that it was only giving half boost. I hunted around and the pipe had fallen off from this little APC unit. Popped it back on, and normality was returned. Although it (the unit) makes a funny ticking noise, which sounds odd but it seems to work ok Rick > >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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