Small roar at low throttle
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Senior User
Joined: Jan 2010
Posts: 269
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Small roar at low throttle
Ok, still working out some issues:
It may be normal, but I hear (not feel) a slight roar when I'm pressing throttle petal very lightly. Seems to do it as we'll when I'm backing off throttle but it stops when I let off pedal completely. Not there when I get into the pedal. Not the tires because it stops all together when I get off throttle and let it roll. Turbo maybe ? Rear end (wouldn't it do it even when rolling)? No vibrations at all....just a little roar.
Any ideas ?
Thanks
It may be normal, but I hear (not feel) a slight roar when I'm pressing throttle petal very lightly. Seems to do it as we'll when I'm backing off throttle but it stops when I let off pedal completely. Not there when I get into the pedal. Not the tires because it stops all together when I get off throttle and let it roll. Turbo maybe ? Rear end (wouldn't it do it even when rolling)? No vibrations at all....just a little roar.
Any ideas ?
Thanks
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
If you have no symptoms of any issues other than a weird sound, my experience would tell me to roll with it. "Stinky has moods". My truck will not only change sounds, but feel different without an army of mechanics or myself understanding why. If it's just a subtle oddity with sound, you might not be able to record it to share on the forum. If this is the case, I would file that under "The nuances I notice as I get to know the truck better".
Fleet Mechanic
Joined: Aug 2006
Posts: 1,465
Likes: 17
From: Jacksonville, FL
Could it be your rear end? I know mine started with a low roar/howl and got worse pretty quick, and had similar conditions under which it made the noise. Mine has about the same, actually a little less miles on it when it happened. It could also be your carrier bearing.
This is a relatively easy and importantly free diagnosis.
Jack the rear end up, put it on jack stands, CHOCK/BLOCK THE FRONT WHEELS (also may a good idea not to point the truck at anything you would miss if it came off the stands and headed out!)
Check the middle of the truck and around the rear end for any weird noise (do not crawl under the truck or get near any moving parts in the process).
Do NOT forget to brake until the wheels stop before putting it back in park, the pawl makes a hell of a racket if you try to put it in park with the wheels still turning (ask me how I know!)
You can check the magnet on the rear end fill plug for any signs of metal flakes also (mine looked like silver anti-seize due to the bearings delaminating/failing)
If everything sounds good your issue may be else where.
This is a relatively easy and importantly free diagnosis.
Jack the rear end up, put it on jack stands, CHOCK/BLOCK THE FRONT WHEELS (also may a good idea not to point the truck at anything you would miss if it came off the stands and headed out!)
Check the middle of the truck and around the rear end for any weird noise (do not crawl under the truck or get near any moving parts in the process).
Do NOT forget to brake until the wheels stop before putting it back in park, the pawl makes a hell of a racket if you try to put it in park with the wheels still turning (ask me how I know!)
You can check the magnet on the rear end fill plug for any signs of metal flakes also (mine looked like silver anti-seize due to the bearings delaminating/failing)
If everything sounds good your issue may be else where.
Thread Starter
|
Senior User
Joined: Jan 2010
Posts: 269
Likes: 2
Could it be your rear end? I know mine started with a low roar/howl and got worse pretty quick, and had similar conditions under which it made the noise. Mine has about the same, actually a little less miles on it when it happened. It could also be your carrier bearing.
This is a relatively easy and importantly free diagnosis.
Jack the rear end up, put it on jack stands, CHOCK/BLOCK THE FRONT WHEELS (also may a good idea not to point the truck at anything you would miss if it came off the stands and headed out!)
Check the middle of the truck and around the rear end for any weird noise (do not crawl under the truck or get near any moving parts in the process).
Do NOT forget to brake until the wheels stop before putting it back in park, the pawl makes a hell of a racket if you try to put it in park with the wheels still turning (ask me how I know!)
You can check the magnet on the rear end fill plug for any signs of metal flakes also (mine looked like silver anti-seize due to the bearings delaminating/failing)
If everything sounds good your issue may be else where.
This is a relatively easy and importantly free diagnosis.
Jack the rear end up, put it on jack stands, CHOCK/BLOCK THE FRONT WHEELS (also may a good idea not to point the truck at anything you would miss if it came off the stands and headed out!)
Check the middle of the truck and around the rear end for any weird noise (do not crawl under the truck or get near any moving parts in the process).
Do NOT forget to brake until the wheels stop before putting it back in park, the pawl makes a hell of a racket if you try to put it in park with the wheels still turning (ask me how I know!)
You can check the magnet on the rear end fill plug for any signs of metal flakes also (mine looked like silver anti-seize due to the bearings delaminating/failing)
If everything sounds good your issue may be else where.
And thanks for the post. This site is great stuff
Jed
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Fleet Mechanic
Joined: Aug 2006
Posts: 1,465
Likes: 17
From: Jacksonville, FL
I believe mine was around $700 - $750 and that was just for all the bearings to be replaced in the rear end (I didn't feel at all confident in doing it myself, differentials and auto transmissions are about the only two things I don't feel good about diving into). My ring and pinion were still (thankfully) in good shape. I was hoping it was something smaller and had just replaced the u-joints, greased the splines and replaced the carrier bearing on the rear shaft a couple of weeks earlier, that obviously did not solve the problem, but at least I know the history of my rear end from the xfer case back now.
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