Date: Sun, 30 Dec 2001 19:54:18 +0000 From: Richard Chew <Richnopsameldo.demon.co.uk> Subject: Re: APC-Problem: Pressure too high
Could the waste gate be seized? Whether the APC system is working properly or not, it is the waste gate which ultimately controls boost pressure. If it has seized then whatever the APC system tries to do, it will always overboost and you'll get the overboost protection cutting in, which is the ECU killing the power to save the engine, this is the 'jerking' you get from the engine. Hope this helps, Rich In article <3C26FC3F.FBD8D6BAnopsamrmail.de>, D.Anders <D.Andersnopsamrmail.de> writes >I have a problem with my APC-system. It shows as follows: when "pushing >the pedal to the floor", the >APC-needle is wandering into the red range and finally the fuel-flow >seems to be interrupted >(performance is intermittent-or in other words: the engine is jerking). >The dealer did minor works with >no success, then the car came into the garage for the inspection >(110.000 km). The dealer couldnĄt >reproduce the fault but I could immediately after having driven the >engine hot. So they changed the >control unit (located in front of the glove-compartement). It seemed to >solve the problem during the >first day. The "jerking" happened only once during full throttle, the >APC-needle left in the yellow range >and my idle problems (rpm not stable, moving up and down until sometimes >the engine dies) didnĄt show >up anymore. After driving some 100 km on the road the problem is almost >as bad as before. > >1. Is it possible to upgrade the control unit (as flashing a BIOS)? >2. Does anyone has similar problems and / or know how to fix it? > > >Merry Christmas / Froehliche Weihnachten!!! > > >Dieter Anders > > >Saab R 900 ( equipement as 900 SE) >1996 >111.000 km >2.0 turbo > -- Richard Chew
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