Question about 1990 Saab 900 Hatchback

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SAAB 900 1988


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  • saabreur
    saabreur May 11, 2010

    Hi Lea: first off, the turbo model is a 16 valve engine; are you sure that your's is either a turbo or an 8 valve? Do you have a boost pressure gauge in the dashboard? How does it change when you're driving? What do you mean by 'a bit slow' and 'working proper'? Are there any other symptoms, knocking or anything else? The turbo charger system is quite complicated to trouble shoot, and getting it wrong can destroy the engine - some things are best left to a trusted professional. Let us know more Saabreur


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Your problem with the APC system. Any perceived fault and you only get base boost. The most likely fault is the boost pressure sensor located under the dash on the left-hand side. when it is bad you often hear the APC solenoid valve clicking at idle.

Posted on Mar 25, 2009

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My Saab 9-3 turbo wastegate seems to be stuck open. Pressure builds but will not kick on the turbo. Suggestions?

I think the actual problem may be generic to Saabs of the same age. So maybe this information will help many others

Yes the turbo was faulty but no it was simple to fix and did not cost me a lot.

the wastegate ( a valve which is opened to switch on the turbo) is driven by a vacuum actuator - and the actuator leaver arm which connects to the wastegate to the actuator had fallen off.

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