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Ive been noticing lately whenever i turn my ignition off there has been a noticeable hissing sound...It sounds like the vaccum but i'm not sure. I was wondering if anyone has had this problem and what is causing this
Have someone turn off the car while you listen under the hood. The biggest thing it to pinpoint the location of the hissing. Maybe it's a bad check valve in the vacuum hose for the brake booster??