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  1. V

    Vacuum type howling

    I have a 98 explorer sport 4.0 ohv manual transmission. Between about 1500 rpm - 2000 rpm, I get this annoying rather loud vacuum type howling coming from the air box. Doesn’t matter if I’m stopped or driving, it comes on about 1500 rpm and keeps howling up to 2000 rpm. When I come up to a...
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