2004 Explorer spooling like turbo

Jo060 · 02-21-2005, 09:54 PM

Hey, I own a 2004 Ford Explorer, and every time it hits about 3000rpm it will make a spooling noise like a turbo charger. The noise comes from the the passanger side which is also the side the intake is on under the hood.
I'm able to hear it with the AC on or off.
Any idea what this is?
Joe

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