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Can I assume

Old 05-08-2017, 05:50 PM
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Join Date: Jan 2012
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Default Can I assume

Listened to my daughters 2001 Mazda Protégé as she pulled into the driveway this evening. Sounded like a low bellowing noise as she let off the gas and put in park...Never quite heard a sound like this coming from an engine,,,,So I lifted the hood and the sound was coming from under the valve cover when I revved up the engine by hand while running and then let go...A low bellow sound came as the rpms went back to idle. So I removed the oil cap and gush of air is escaping...Pretty strong. So assuming I have a plugged PCV valve. Does anyone disagree ? Or any other ideas out there on what it could be ?

Thanks in advance
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