Whining sound during acceleration

[olbaldi]

My 2004 Expedition 5.4L2 has had a whining sound that rises with acceleration and stops when I take my foot off the pedal. When I start accelerating again, it starts again. This is my second Expedition and I noticed a similar sound with a 2000 model. It's not the tires, as replacing them hasn't caused any change. It seems a bit louder on the driver side. It's not a high pitched squeal, more like a consistent higher pitched moan. It is very consistent, not up and down (unless I take my foot of the accelerator. Any ideas?

 

[toms89]

Bearings??

Change with vehicle or engine speed??

 

[jjbusa]

You a I get the same noise from 42 to 65 MPH weird

 

[mindgame]

Rear differential?
http://www.justanswer.com/uploads/bkitchener/2009-08-12_162454_axle_noise.pdf

 

[rvm1]

I have the same model and problem. Fortunately, it happened when the Expy was 2 years and Ford replaced the rear differential under warranty

Sent from my HTC using Tapatalk 2

 

[FordandPolaris]

My gma's exploder had that signature Ford hum in the rear diff from the day she bought it. Never heard it in my expy though. Granted my exhaust would probably mask it anyways...

 

[mindgame]

Get one of these.. It works great, since I'm always under my Expy..
97202 - Steelman Tools

 

[01yellerCobra]

Sounds like gears to me. The pinion depth may not be correct. I've heard of the same issue when coasting.

 

[sgtowing]

Supercharger I know, I'm just being a smart ass.

 

[joezek]

Mine makes a loud whining noise under hard acceleration from under the hood. Sounds exactly like a supercharger, but quieter. It's not always there, only makes the noise when it's cold. I'm thinking possibly the power steering pump.

 

[Goldnpaw]

Finally!!!!! Whine noise solution!!

2005 expy, engine whine noise in cold weather only, and when running around 2000 rpm...noise would occur when moving, or when vehicle parked. Speed was irrelevant. Every winter for 8 years.....its the alternator. This is NOT. An electrical whine, its a mechanical whine. Had to replace alternator, sound went away instantly. 0 degrees outside, not a sound to be heard. 5.4L v8. .....you would swear it was an airflow noise...but it is not.

 

[shocker1]

vibrating hum

i have the 2004 expo and i had that noise last year but nothing that caused concern, but this year it has started getting worse, i thought it was a bearing issue at first, then sorta thought maybe a drive shaft nun of these I've looked into it is just a guess at this point. it used to be a quiet hum till i reached speed of 70MPH + its just gotten lauder and has been more noticeable at lower speeds. its not a vibration like you get from tires or bad brakes, been sitting here trying to find a way to describe .........

 

[kevinb]

Serpentine belt tensioner?

 

[sgtowing]

No hidden supercharger????

Sent from my SCH-I535 using Tapatalk

 

[shocker1]

results

took the expo in and found out it was bearings in the rear so the whole rear end had to be taken off and worked on at table, just over a grand later, sound gone.

 

[sgtowing]

Ouch. At least the sound us gone.

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[dvandoormaal]

Whirring/moaning sound under the hood

Im having the same sorta problem.

A moaning sound, more so when the truck is cold, that increases with RPM and in certain RPM ranges.

Have a different humming noise at 80-100kph which Im thinking might be the rear end. Its very much due for a fluid change and the truck has over 300k km / 190mi on it so hopefully the fluid/friction modifier will help and its not the rear end gears.

As for the front end whine, the following video is GREAT for checking the belt and tensioner which are apparently notorious. Im gonna try this on my lunch break

This guy makes AWESOME AWESOME AWESOME video's! I know hes a member here as well. Cant wait to do my hub/bearing replacements using his other video.

https://www.youtube.com/watch?v=jAaF-XMdF7A

 

[dvandoormaal]

Bump

 

[Williamb97]

Just got our 2015 Expedition out of the shop for a similar issue. It was caused by the way the electronic control module was mounted. Ford has sent something to dealers about this issue. I wish I had got a copy of it.