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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 

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