Date: Fri, 17 Jul 1998 16:00:28 -0700 From: Justin VanAbrahams <jvanabranopsamnet> Subject: Re: 900T16S Dump Valve?
Guy Maslin wrote: > > I too have a noisy dump valve on my 1991 900T16. All attempts to cure it > have met with failure and SAAB are being incredibly obstructive about > providing details of the wiring diagram of the related circuitry. ( Company > Policy, Sir !) > > Does anyone know how to stop the valve sounding like a demented woodpecker ? > Um... there is no wiring associated with the '91 900T16 dump valve. It is attached to the fresh-air side of the turbo at a "T" intersection, and to the intake manifold at the throttlebody. There is a vacuum line running from the intake manifold to the top of the valve. That's is. The valve will make noise when the diaphragm is ripped, torn, or otherwise mis-seated (i.e. failed) or sometimes if it is doing its job. The sound is sometimes a whistle, but more often a hooting sound made by the valve. A failed valve will often result in a high or irregaular idle. If you're getting some other noise, I'd suggest you look elsewhere. -Justin