06screwlariat

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

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CruizinF150

I have the exact same noise......steering doesnt affect it. If you find out please let me know, drives me insane!!!

alsatropine

iTrader: (2)

Might be the bearings in the alternator or the idler pulley.

techrep

iTrader: (1)

had the same noise...it was the idler pulley..

donbun68

Same here. Drove me nuts till I replaced it. Very simple job tho.

06screwlariat

I replaced one with a duralast one from autozone but I've always thought their stuff was junk

techrep

iTrader: (1)

It's covered under the warranty if you still have it.. Ford replaced mine for free..

donbun68

Bought mine at Advance Auto 2 years ago, no problems.

CruizinF150

Awesome. Thanks for the info, have to add that to my to do list!

06screwlariat

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....