Vibration
Thread Starter
Racer
Joined: Oct 2007
Posts: 431
Likes: 22
From: Chester Illinois
Vibration
Took my newly bought 2000 on a 600 mile road trip over the week end. Car has a slight vibration that comes on around 58 mph. Feels like it is in the rear. No steering wheel shake. I have read that the wheels are hard to keep balanced. Kinda did it when I first got it but smoothed out at higher speed. Now is continues but doesn't get worse in higher speed. Guess I will start with wheel balance. Any other suggestions would be appreciated. Thanks Rich
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Give the WHEEL HUBS a good inspection. There should be little to no free play if you raise the wheel and shake at the 3-9 & 12-6 O Clock positions.
Also check the differential mount for wear/damage.
I have never had any problems balancing my C5 wheels and keeping them balanced.
Is the car an A4 or MN6 trans??? IF, its an MN6, has the clutch ever been changed??
Bill
Also check the differential mount for wear/damage.
I have never had any problems balancing my C5 wheels and keeping them balanced.
Is the car an A4 or MN6 trans??? IF, its an MN6, has the clutch ever been changed??
Bill
Thread Starter
Racer
Joined: Oct 2007
Posts: 431
Likes: 22
From: Chester Illinois
Give the WHEEL HUBS a good inspection. There should be little to no free play if you raise the wheel and shake at the 3-9 & 12-6 O Clock positions.
Also check the differential mount for wear/damage.
I have never had any problems balancing my C5 wheels and keeping them balanced.
Is the car an A4 or MN6 trans??? IF, its an MN6, has the clutch ever been changed??
Bill
Also check the differential mount for wear/damage.
I have never had any problems balancing my C5 wheels and keeping them balanced.
Is the car an A4 or MN6 trans??? IF, its an MN6, has the clutch ever been changed??
Bill
Le Mans Master
Joined: Dec 2008
Posts: 5,414
Likes: 25
From: Texas
i would start with wheel and tire inspection and balance. try to find someone who has a road force balancer (and will use it).
also inspect the wheel bearings and hubs for any signs of play.
also inspect the wheel bearings and hubs for any signs of play.
Last edited by tommie; Mar 6, 2017 at 12:15 PM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
If all that is mentioned above checks out fine, I would suspect the Torque Tube Bushings. The A4 Torque Tubes have the smaller 10mm bushing and they are found deteriorated/rotted more than not.
The bad part is you have to remove the drive train (engine bell housing- reward) to get it out and inspect it.
Bill
The bad part is you have to remove the drive train (engine bell housing- reward) to get it out and inspect it.
Bill
Advanced
Joined: Feb 2014
Posts: 52
Likes: 10
From: Grover North Carolina
I also have a 2000 model, base 6 speed, I had the same vibration you describe and thought it was a rear wheel out of balance, Long story short it was a warped left front wheel. Bought a replacement and all is good.
Thread Starter
Racer
Joined: Oct 2007
Posts: 431
Likes: 22
From: Chester Illinois
Racer
Joined: Jun 2016
Posts: 380
Likes: 67
From: Kelso Wa.
I had a vibration that I noticed @ 70mph on the way home from my purchase. Further investigation revealed the vibration would also be replicated in park and neutral @ approx. 1500-2000 rpm. I suspected the possibility of the driveline having bad couplings, but after removing the serpentine belt, it went away. Tried replacing the alternator, no joy. So I removed the water pump, put it in a vise on the bench, bearings felt smooth, then blew air onto the impeller to gain some speed and watched it vibrate the bench. Replaced the water pump (probably an aftermarket) and life is good.
Btw, mine is a '99 A4 with 82000 mi.
Btw, mine is a '99 A4 with 82000 mi.
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Thread Starter
Racer
Joined: Oct 2007
Posts: 431
Likes: 22
From: Chester Illinois
Looks like this is gonna be a SOB to diagnose. Haven't started looking yet. People riding with me can't hear it or feel it but me as the driver you get the feel of the car in the seat. Something is not right and it starts around 58 mph and you got to be on smooth surface. Thanks for the replys and will keep you all informed
Last edited by namvet6869; Mar 6, 2017 at 10:35 PM.