Date: Wed, 16 Mar 2005 12:47:30 -0500 From: "The Malt Hound" 8dSdnXKRT5GfxKXfRVn-gAnospamphia.com... > > <eric.perduenospaml.com> wrote in message > news:1110926071.591128.198760nospam2000cwb.googlegroups.com... >>I have been living with an overboost problem on my '92 9000 for a >>while >> now due to financial constraints. The turbo will boost to where it >> starts touching red on the gauge which will in turn cut out the >> fuel >> pump to save the motor...the overall effect is kind of a "bucking" >> phenomenon. Very annoying, especially on the freeway, and >> potentially >> dangerous as power may not be there when needed. A good friend and >> car >> wiz (not much experience with Saab, but very well versed in most >> European makes - he works as a lead tech for a VW dealer) suggested >> that I replace the APC valve. His suggestion fit in with the >> reading I >> have done, so I ordered a new one and slapped it in today. Although >> the >> problem is alleviated quite a bit, it ain't gone. WHere would be >> the >> next place to look? I want my HP back!!! >> > > A few ideas: > > 1st, do we know for 100% sure that it really is overboosting and not > just that the safety switch is sensing an overboost prematurely? If > you have a pressure pump (MightyVac, etc.) you could test the switch > to make sure it isn't lying. > > 2nd, if it really is overboosting, can you actuate the wastegate if > you hook up to it directly with the same pump? Use the hose that is > normally connected to the APC solenoid. How much pressure does it > take? Does the pressure hold or does it bleed off? > > 3rd, triple check the hose-routing to the APC solenoid is correct. > If you hose-up the hoses you might be hosed. ;-) > > -Fred W > One further point, I had a '92 9000T a while ago and it boosted well into the red area of the boost gauge. You may not have an overboost problem at all. -Fred W