Harmonic Vibration
Thread Starter
Instructor
Joined: Aug 2005
Posts: 128
Likes: 0
From: Irvine CA
Harmonic Vibration
Lately i have been noticing a vibration when i drive. At about 45mph it starts, and does not go away. It seems to get a little faster with speed, untll it gets constant and you cant really tell it is happening any more.
It is a cyclic vibration (it's not constant, but it is repeating).
Anyone have any idea what it might be?
I have heard anything from an out of balance Cam shaft to a damaged half shaft.
Anyone have any ideas?
Thanks!!!
(p.s. Car is goin to the shop tomorrow to have it checked out but i like to go in there with a little more information then, hey it's making noise fix it)
--Josh
It is a cyclic vibration (it's not constant, but it is repeating).
Anyone have any idea what it might be?
I have heard anything from an out of balance Cam shaft to a damaged half shaft.
Anyone have any ideas?
Thanks!!!
(p.s. Car is goin to the shop tomorrow to have it checked out but i like to go in there with a little more information then, hey it's making noise fix it)
--Josh
Race Director
Joined: Oct 2004
Posts: 10,089
Likes: 14
Originally Posted by santsys
Lately i have been noticing a vibration when i drive. At about 45mph it starts, and does not go away. It seems to get a little faster with speed, untll it gets constant and you cant really tell it is happening any more.
It is a cyclic vibration (it's not constant, but it is repeating).
Anyone have any idea what it might be?
I have heard anything from an out of balance Cam shaft to a damaged half shaft.
Anyone have any ideas?
Thanks!!!
(p.s. Car is goin to the shop tomorrow to have it checked out but i like to go in there with a little more information then, hey it's making noise fix it)
--Josh
It is a cyclic vibration (it's not constant, but it is repeating).
Anyone have any idea what it might be?
I have heard anything from an out of balance Cam shaft to a damaged half shaft.
Anyone have any ideas?
Thanks!!!
(p.s. Car is goin to the shop tomorrow to have it checked out but i like to go in there with a little more information then, hey it's making noise fix it)
--Josh
Drifting
Joined: Feb 2005
Posts: 1,311
Likes: 1
From: Los Angeles CA
Originally Posted by shopdog
Most speed dependent vibrations are wheel/tire or driveline related. In the extremely unlikely case of an engine, or engine accessory, problem, the vibration would be RPM related rather than speed related. In other words, it would show up at different speeds depending on what gear you're in.
Thread Starter
Instructor
Joined: Aug 2005
Posts: 128
Likes: 0
From: Irvine CA
Originally Posted by shopdog
Most speed dependent vibrations are wheel/tire or driveline related. In the extremely unlikely case of an engine, or engine accessory, problem, the vibration would be RPM related rather than speed related. In other words, it would show up at different speeds depending on what gear you're in.
If anyone has any other ideas, please feel free to chime in
Thanks Again!
--Josh
Drifting
Joined: Feb 2005
Posts: 1,311
Likes: 1
From: Los Angeles CA
My first guess would be tires...you didnt mention how long you have had car and/or how many miles on those... does it do this on all types of road surfaces or only a certain type (cement vs asphalt, etc.) Is the sound local to an area in vehicle or does it come from all places?
Stupid question I know but just to rule out the obvious: have ya checked the pressure on the tires?
Let us know what they find out....
Stupid question I know but just to rule out the obvious: have ya checked the pressure on the tires?
Let us know what they find out....
Thread Starter
Instructor
Joined: Aug 2005
Posts: 128
Likes: 0
From: Irvine CA
Originally Posted by Mocoso
My first guess would be tires...you didnt mention how long you have had car and/or how many miles on those... does it do this on all types of road surfaces or only a certain type (cement vs asphalt, etc.) Is the sound local to an area in vehicle or does it come from all places?
Stupid question I know but just to rule out the obvious: have ya checked the pressure on the tires?
Let us know what they find out....
Stupid question I know but just to rule out the obvious: have ya checked the pressure on the tires?
Let us know what they find out....
Tires and car have about 1,300 miles on it. it does it on ever road i have driven on so far, freeways (I-5) and side roads... It's not really a sound, it's a vibration, i can here it a little, but i can feel it more than anything. can feel it on the floor and on the clutch pedal when i have my foot touching it...
maybe a tire is out of balance, never thought about that... hmm... intereseting...
Melting Slicks
Joined: Feb 2005
Posts: 2,179
Likes: 97
From: Palm Coast, FL
You might just try to put the transmission in neutral when the vibration starts just for elimination perposes to see if it stops with the transmission in neutral, whether it be an Auto or 6 speed. Keep us posted if you try this on the way to the dealer's.
good luck
good luck
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I sounds like wheel balance where it's speed and not RPM related.
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Thread Starter
Instructor
Joined: Aug 2005
Posts: 128
Likes: 0
From: Irvine CA
Originally Posted by purple heart
You might just try to put the transmission in neutral when the vibration starts just for elimination perposes to see if it stops with the transmission in neutral, whether it be an Auto or 6 speed. Keep us posted if you try this on the way to the dealer's.
good luck
good luck
I'll let you all know what they find... if anything... (loose nut behind the Wheel
) --Josh
Thread Starter
Instructor
Joined: Aug 2005
Posts: 128
Likes: 0
From: Irvine CA
Latest update...
Car is staying overnight, they were able to reproduce the problem. They are going to be swaping wheels/tires to make sure its not that. But they think it is a wheel baring.
I'll let you know what they actually end up replacing.
--Josh
Car is staying overnight, they were able to reproduce the problem. They are going to be swaping wheels/tires to make sure its not that. But they think it is a wheel baring.
I'll let you know what they actually end up replacing.
--Josh
Racer
Joined: Aug 2000
Posts: 300
Likes: 2
From: Ranch Cucamonga CA
Originally Posted by santsys
Lately i have been noticing a vibration when i drive. At about 45mph it starts, and does not go away. It seems to get a little faster with speed, untll it gets constant and you cant really tell it is happening any more.
It is a cyclic vibration (it's not constant, but it is repeating).
Anyone have any idea what it might be?
I have heard anything from an out of balance Cam shaft to a damaged half shaft.
Anyone have any ideas?
Thanks!!!
(p.s. Car is goin to the shop tomorrow to have it checked out but i like to go in there with a little more information then, hey it's making noise fix it)
--Josh
It is a cyclic vibration (it's not constant, but it is repeating).
Anyone have any idea what it might be?
I have heard anything from an out of balance Cam shaft to a damaged half shaft.
Anyone have any ideas?
Thanks!!!
(p.s. Car is goin to the shop tomorrow to have it checked out but i like to go in there with a little more information then, hey it's making noise fix it)
--Josh
Melting Slicks
Joined: Feb 2005
Posts: 2,179
Likes: 97
From: Palm Coast, FL
Originally Posted by santsys
Still has the vibration even when in neutral (clutch in or out). It's at the shop now. Hope they find something (feels wrong saying that, but it's better then having to live with an annoying problem.)
I'll let you all know what they find... if anything... (loose nut behind the Wheel )
--Josh
I'll let you all know what they find... if anything... (loose nut behind the Wheel
) --Josh
Sal
Drifting
Joined: Feb 2005
Posts: 1,311
Likes: 1
From: Los Angeles CA
Originally Posted by santsys
Latest update...
Car is staying overnight, they were able to reproduce the problem. They are going to be swaping wheels/tires to make sure its not that. But they think it is a wheel baring.
I'll let you know what they actually end up replacing.
--Josh
Car is staying overnight, they were able to reproduce the problem. They are going to be swaping wheels/tires to make sure its not that. But they think it is a wheel baring.
I'll let you know what they actually end up replacing.
--Josh
.... glad they were able to reproduce and you didnt get the "there aint notin wrong wut here yer car" - do let us know what they replace ...
Thread Starter
Instructor
Joined: Aug 2005
Posts: 128
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From: Irvine CA
Ok, new update...
Well after a few road tests and the use of some special listening device... they have replaced all the tires and wheels, and have concluded that it is nothing that they thought it was. So they have been on the phone with engineers from GM trying to get it figured out... so no clue what is wrong or how long it will take to fix.
yep...
--Josh
Well after a few road tests and the use of some special listening device... they have replaced all the tires and wheels, and have concluded that it is nothing that they thought it was. So they have been on the phone with engineers from GM trying to get it figured out... so no clue what is wrong or how long it will take to fix.
yep...
--Josh
Last edited by santsys; Dec 14, 2005 at 08:01 PM.
Thread Starter
Instructor
Joined: Aug 2005
Posts: 128
Likes: 0
From: Irvine CA
Originally Posted by Jimbeaux
I had a noisy rear wheel bearing, but no vibration. The dealer replaced the bearing.
I wish that was what mine was... I never get anythign simple to happen... But hey, at least they are working on it and are not giving me the run around. I am very happy about that.
--Josh