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Old 08-16-2013, 01:42 PM   #1
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On my 2006 Ford F-150 with the 5.4, there's a loud whining noise, just like a supercharger, sounds like its coming from the serpentine belt and pulleys. I replaced the belt and an idler pulley about 6,000 miles ago, and the problem didn't show itself until recently. I had replaced the belt with a Goodyear gator-back. The sound changes with the RPM's, and can be heard loud at idle and higher RPM's. I've attached some videos, can someone provide input of what it might be? I thought it could be the power steering pump but the noise isn't affected by turning the wheels, just acceleration. Maybe a bad pulley somewhere? I'm not sure

v=Rljme0lCH7M

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Old 08-18-2013, 10:10 PM   #2
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I have the exact same noise......steering doesnt affect it. If you find out please let me know, drives me insane!!!
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Old 08-18-2013, 10:28 PM   #3
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Might be the bearings in the alternator or the idler pulley.
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Old 08-19-2013, 07:30 AM   #4
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had the same noise...it was the idler pulley..
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Old 08-19-2013, 07:58 AM   #5
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had the same noise...it was the idler pulley..
Same here. Drove me nuts till I replaced it. Very simple job tho.
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Old 08-19-2013, 09:50 AM   #6
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Same here. Drove me nuts till I replaced it. Very simple job tho.
I replaced one with a duralast one from autozone but I've always thought their stuff was junk
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Old 08-19-2013, 09:59 AM   #7
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It's covered under the warranty if you still have it.. Ford replaced mine for free..
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Old 08-19-2013, 10:00 AM   #8
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I replaced one with a duralast one from autozone but I've always thought their stuff was junk
Bought mine at Advance Auto 2 years ago, no problems.
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Old 08-20-2013, 09:06 AM   #9
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Awesome. Thanks for the info, have to add that to my to do list!
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Old 08-20-2013, 01:21 PM   #10
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Just replaced all 3 idler pulleys, it's still there! it does it whether the A/C is on or off, So i don't think it's that one. So maybe the alternator? Don't really want to buy a new one considering the one that's on there works just fine.....possibly belt? it's the expensive gatorback that's pretty new....
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