I have a 1988 Saab 9000, there's a hissing sound while idling and it disappears when I apply moderate acceleration but comes back really loudly when the boost would have kicked in. I can't really tell whether there is any boost when I step hard on the gas, but the needle on the turbo gauge never budges from the line between the white (or green) and yellow regions.
The hissing comes from the intake manifold, and I think it's right at the wye connection to the intake. The hose clamps onto a plastic tube which then plugs into the manifold, I'm not sure how tight the connection is and whether it might be a gasket problem or something like that. I've checked the connections under the dashboard and at the hooter valve, they seem secure and the lines look fine, but the noise seems to come straight from the intake manifold.
posted by 67.159.8...
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