Bad humming sound when I let off of the Gas? - Ford Powerstroke Diesel Forum
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Old 03-13-2013, 11:36 AM
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Bad humming sound when I let off of the Gas?

Coming home from work last night in my 05 f250, I let off of the gas and heard a really bad humming/roaring sound. I really have no clue what this could be except for the turbo. Any ideas? I also know that it doesnt make this noise when im idleing and rev it, i think its because it doesnt build boost when i rev it. Thanks in advance.
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Old 03-13-2013, 11:37 AM
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gas?????????????
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Old 03-13-2013, 11:38 AM
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Sorry, i mean the accelerator.
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Old 03-13-2013, 11:39 AM
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LOL, does it feel like surging? My 7.3 does it when i let off too.....i thought it was normal LOL
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Old 03-13-2013, 11:42 AM
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I dont think so, its more like its leaking air pressure. I know what a turbo fart is, im sure that its not that.
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Old 03-13-2013, 11:46 AM
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hmmmmmmmmmmmmmmmmmmmm.....free bump
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Old 03-13-2013, 11:52 AM
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my work truck does a sound, not sure if its the same but I'm almost sure its rear end going out, but its not mine to maintain .
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Old 03-13-2013, 12:01 PM
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NO WAY is that rear end going out!
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Old 03-13-2013, 12:12 PM
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Try singing instead of humming

Do you have an aftermarket exhaust? Does it sit or rub on the frame? It sounds like a vibration problem; now you just have to find where it is. If it is turbo related and you don't build boost, then that is either supply side (exhaust), or charge side (boost). If you have cracks on either side, this could easily cause both symptoms. Of course, your turbo could be rubbing internally or be very dirty on the turbine side.

Easiest way to proceed is to take off the intake and spin the turbo with your finger, them wiggle it and see if it rubs. After that, do a real good inspection of the up-pipes and exhaust. Move to the boost side and do the same.

It could be drive-line related, but that wouldn't explain your comment.
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Old 03-13-2013, 07:14 PM
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Ill make sure to check the turbine tomorrow. Yes I do have an aftermarket exhaust but it isn't rubbing. It sounds like air more than a vibration.
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