Date: Thu, 28 Nov 2002 21:25:29 +0000
From: Richard Chew <>
Subject: Re: 9000 Aero cutting out

Hi, not exactly sure what it could be, but if its overboosting then the first thing I'd check would be the wastegate - make sure the actuator rod is attached to the wastegate arm, and that the wastegate isn't seized. It's possible that the wastegate has seized in a part open position, giving you some boost at part throttle, but giving no means of boost control on full throttle, causing the overboost? Bit of a long shot, but its a possibility. Also as you say it stopped boosting into the red, then I'd suspect a seized or sticking APC valve, not sure if you can strip them down though, and I can't remember now to test them... 'praps someone else can refresh my memory Other than that, I've known problems with the fuel cut off switch (The switch that cuts the fuel when the car overboosts) Which I think is under the dash on the bulkhead on the drivers side. If this at fault, i think you can bridge its connector with a piece of wire for a temporary fix, but remember you'll have no boost protection. Hope this helps Rich In article <lOnF9.79$>, writes >I have a 97 9000 Aero with 50,000 miles. > >It has a larger dump valve. Apart from an ITG air filter, there are no other >engine mods. > >1 month ago, it stopped accelerating into the red on the APC, and was >sluggish. > >I put the original dump valve back, and it cut out under HARD acceleration. >It then >carried on, giving the impression of a kangaroo hop at 75 mph. (very cool). >This happened >in every gear, and at various revs, but only happened when I "floored" it. > >I went to my local Saab main dealer, who put a brand new dump valve in, and >it >only cut out 1 in 5 times. They said I have overboost ? > >I put my old performance dump valve back, and it now whistles, before >cutting out >It still has overboost under hard acceleration, but its fine under normal >acceleration. > >The fuel is also down to 300 miles per tank. > >I have been in touch, but the main dealer have no idea, and want the car for >2 days >to run tests. > >I have just lost my job, so any ideas would be appriciated, as I cannot >afford 60 + per hour >for Saab to diagnose this. > >Many thanks. > >Ian (UK) 97 Imola red 9000 Aero -- Richard Chew

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