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Old 05-09-2010, 04:48 PM
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Humming noise on acceleration

99f250. Haven't had this truck for long but I think I hear a new noise. Kind of a humming noise when I push the accelerator down. Stops when I let off the pedal. I hear it at high speeds so I don't know if that takes the power steering pump off the table, but I sounds like the powersteering pump does when I turn. Ps pump does sound loud so I don't know if it is on it's way out. Any ideas???
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Old 05-09-2010, 04:54 PM
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can you hear the noise if you are not moving? Just sitting still and revving it?
If so, unhook the belt and run it a minute. If its gone you know its something up front spinning? Most likely ps pump.
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Old 05-09-2010, 05:39 PM
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Mine is the same, was the same way. Suck all of the old PS fluid out and buy some Lucas PS fluid ( PS stop leak I think is what they call it) Run it a couple hours worth of driving to give it time to get the rest of the old fluid circulated suck it out again then fill full with just the Lucas oil and you will see and feel a huge differance in your steering.
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Old 05-09-2010, 06:22 PM
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EArmsF350 - Good info. Thanks. Interesting because the power steering cap was a little loose and it needed topped off. I just can't get a straight answer on the type of fluid in there. The manual (for the gas) says its Mercon ATF, but other people saw power steering fluid is fine. Thoughts?
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Old 05-09-2010, 06:23 PM
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Melmount. Yes, I can still here it at a stop. Not as noticeable as when I am going about 40 or so. Maybe just because the truck idles loud.
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Old 05-09-2010, 07:03 PM
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it uses atf fluid.
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Old 05-10-2010, 09:23 AM
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Any other thoughts?? I will purge and fill the ps fluid again, but I don't think that is it because it is noticeable at high speeds when i driving straight as a nail. Just sounds like a pump or whining, humming noise. Sounds like it is under the acclerator or at least on the drivers side of the truck.
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Old 05-10-2010, 05:11 PM
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Nobody? This doesn't sound good. I can't afford another major repair right now. Gotta nip this in the bud.
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Old 05-10-2010, 06:04 PM
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un hook the fan belt and drive it. It wont overheat in a mile.
see if it goes away. if so its up front? if not maybe tranny pump??
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Old 05-11-2010, 02:05 AM
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Ford Super Duty Power Steering Flush | Superdutypsd.com

Personally I think it sounds like a U joint issue. Might want to check your U joints and check them for any play but you may need a PS flush.
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