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Originally Posted by WillalwaysownaFord
I have a 1997 Ford Explorer 4.0l V6 i cant seem to find the pcv valve i no its cloged becuause it makes a loud humming noise if anyone knows the location it would be a great help if not im sure il find it... most likely its hindin in a difficult place..
peace, Joe
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it could be your idel air control valve.i have a 97 sohc 4.0 and it made a loud horn like sound.i replaced the valve and it fixed the problem.