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Check the rubber elbow attached to the PCV valve. My 1999 Buick Century just started humming this week and I finally found that the rubber elbow conecting the PCV valve to the vacuum hose had collapsed (age wear?) It kind of sounds like when you let the air out of a balloon by pulling the sides of the fill tube, only much lower in pitch and a steady note.

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โˆ™ 2005-04-16 04:15:50
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Q: Why would a 95 Buick Century be making a humming noise when you accelerate it sounds like a power steering hum but that is not the problem?
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