Cannot identify low humming noise
Thread Starter
|
Senior User
Joined: Nov 2011
Posts: 238
Likes: 0
Cannot identify low humming noise
I really notice it at 35 mph. It is a low frequency hum that changes with the engine rpm. It does not happen while still,in park or neutral.
If you make the "M" sound real low, that is what it sounds like. "mmmmMMMMMMmmmmmmmMMMMMM". The higher the speed, the higher pitched the sound. At highway speed I can't hear it anymore. But our dog, who sits in her bed and snoozes at low speeds, will not sit still and bounces all over the truck at highway speeds..I m thinking she doesn't like that higher pitched sound that I can't hear.
I just got finished taking apart the front hubs, cleaning, lubing and checking in general. I had one that wasnt engaging..a lock ring fell out..anyway I know the hubs are functioning and are releasing.=
Oddly, my wife cannot hear it and I'M the one with a hearing aid in each ear!
Thanks,eh?
Brad
If you make the "M" sound real low, that is what it sounds like. "mmmmMMMMMMmmmmmmmMMMMMM". The higher the speed, the higher pitched the sound. At highway speed I can't hear it anymore. But our dog, who sits in her bed and snoozes at low speeds, will not sit still and bounces all over the truck at highway speeds..I m thinking she doesn't like that higher pitched sound that I can't hear.
I just got finished taking apart the front hubs, cleaning, lubing and checking in general. I had one that wasnt engaging..a lock ring fell out..anyway I know the hubs are functioning and are releasing.=
Oddly, my wife cannot hear it and I'M the one with a hearing aid in each ear!
Thanks,eh?
Brad
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
Smart a$$ question have you tried turning your hearing aids down? I know of a case
where a driver had a whistle that the tech could not find and finally had the guy ride
with him to show him what he was doing when the sound happened. It was his hearing
aids when he was in the car making the sound. Some thing to do with the inside sound
reflections would trigger it. May be worth a shot. Turn them down and see if the dog's reaction
changes at the problem speed. If should not take much of a change. Feedback is very easy to change.
Let me know if this helps.
Sean
P.S. This is not a April Fools joke.
where a driver had a whistle that the tech could not find and finally had the guy ride
with him to show him what he was doing when the sound happened. It was his hearing
aids when he was in the car making the sound. Some thing to do with the inside sound
reflections would trigger it. May be worth a shot. Turn them down and see if the dog's reaction
changes at the problem speed. If should not take much of a change. Feedback is very easy to change.
Let me know if this helps.
Sean
P.S. This is not a April Fools joke.
Thread Starter
|
Senior User
Joined: Nov 2011
Posts: 238
Likes: 0
Alas, I cannot turn them down. 
Although I have not heard this sound with my old hearing aids. You may be onto something.
Not sure what is up with the dog. She acts fine in the car at speeds, but not in the truck.
Weird.
Although I have not heard this sound with my old hearing aids. You may be onto something.Not sure what is up with the dog. She acts fine in the car at speeds, but not in the truck.
Weird.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
The dog could be hearing some high frequency
noise and reacting to that. You may not be able
to hear it at all. Dogs can hear that type of
sound better than humans can. Ask your Dr.
or the place where you get the hearing aids serviced.
They may be able to check. Or just take a short drive
with someone and have then aids turned off and see
what the dog does.
Sean
noise and reacting to that. You may not be able
to hear it at all. Dogs can hear that type of
sound better than humans can. Ask your Dr.
or the place where you get the hearing aids serviced.
They may be able to check. Or just take a short drive
with someone and have then aids turned off and see
what the dog does.
Sean
Hotshot
Joined: Apr 2010
Posts: 19,061
Likes: 238
From: Saratoga Springs,UT
Trending Topics
Thread Starter
|
Senior User
Joined: Nov 2011
Posts: 238
Likes: 0
UPDATE!
This noise I m talking aboot is still there, but getting worse. I was mistaken in my first post. The low growl/howl doesnt follow rpm's, it follows driveline speed. It goes away when coasting. It's really noticeable at 35 mph. Wife notices it now, also.
M-chan, what is this downpipe adjustment? Can a guy with limited mechanical experience able to accomplish this?
The transmission works great. Fluid is a nice clean cherry red, but close to a 30K mi change.
And what is a Upipe flexjoint?
Thanks again for you help,eh?
Brad.
M-chan, what is this downpipe adjustment? Can a guy with limited mechanical experience able to accomplish this?
The transmission works great. Fluid is a nice clean cherry red, but close to a 30K mi change.
And what is a Upipe flexjoint?
Thanks again for you help,eh?
Brad.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
Lead Driver
Joined: Mar 2010
Posts: 5,505
Likes: 256
From: Woodbridge, Ontario, CA
Any particular area of the vehicle where the noise can be narrowed down to? The symptom you describe, points almost squarely at a worn out rear diff pinion bearings, and/or the actual crown and pinion gears (more particularly the drive side of the gears' contact area since you indicate that's when the noise occurs).
Laughing Gas
Joined: Mar 2012
Posts: 1,052
Likes: 28
From: Portal, AZ
With my Frontier years ago, seemed to be fine but the neighbors dog one day started barking and pacing around my truck every time it was running. I personally trust dogs and other animals for their hearing and other senses, so I took into the dealer (under warranty still) and told them about the dog. He looked at me crazy and said "I'll look it over real good but if I find nothing Ill have to charge you..." a few hours later he called said it was a small crack in the exhaust manifold and apologized for thinking I was nuts.
just my 2c
Thread Starter
|
Senior User
Joined: Nov 2011
Posts: 238
Likes: 0
do
I will empty out the back seat and see if I can pinpoint the location of the noise.
Any particular area of the vehicle where the noise can be narrowed down to? The symptom you describe, points almost squarely at a worn out rear diff pinion bearings, and/or the actual crown and pinion gears (more particularly the drive side of the gears' contact area since you indicate that's when the noise occurs).
couldent be the smell
Thread
Thread Starter
Forum
Replies
Last Post