Bypass/"Hooter" Valve Hooting? - Saab 9-5 Bulletin Board - Saabnet.com
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Two days before leaving for Carlisle I noticed my car making a hooting sound. Especially when the engine is cold, under light acceleration. As soon as I let off the gas or hit it harder it goes away. It sounds EXACTLY like someone blowing across the top of an empty glass beer bottle. And no, there are no beer bottles under my hood. Seems to be coming from the driver side. The car (2004 Aero, auto, 52k miles) runs fine. I put about 800 miles on it in the past four days.
I assumed bypass valve so I hooked up my MityVac to it and it seems to be holding just fine. The way I understand it the rubber diaphragm rips and makes a hooting sound, right? My pump reads inches of Mercury. I pumped it to 20 inHg, which is about 10 psi. I don't know how much it can hold so I didn't go any further. It held 20 inHg for a good 5 min. Does that rule out the BPV? TIA for any help.
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