Rattle under drivers seat
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Joined: Aug 2003
Posts: 584
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From: Louisville
Rattle under drivers seat
Something is rattling or vibrating once my 1998 MN6 warms up. It usually starts after the first right hand turn, usually on the highway, and/or once I get on it and the RPMs are up. Sometimes it stops once I straighten out the steering wheel but more times than not it becomes constant upon acceleration. I feel like I've checked everything and nothing is loose. There was some play in the motor mounts so I replaced both of those. I am completely stumped...I searched the forum but really didn't find an answer to this. Thanks in advance.
Last edited by ltnate; Jun 15, 2023 at 06:08 PM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Its not clear. Have you taken the seat out and looked at the mounting points for everything.
Does it change with seat position adjustment?
Are you sure it not coming from under the car. Take a look and see.
BC
Does it change with seat position adjustment?
Are you sure it not coming from under the car. Take a look and see.
BC
Thread Starter
Pro
Joined: Aug 2003
Posts: 584
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From: Louisville
I'm sorry, its definitely coming from under the car on the drivers side. Usually starts once I make a right turn, gets a little louder during accelaration. When I'm on the highway it will go away by moving the steering wheel to the left a little.
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
Raise the vehicle. Examine the exhaust. Shake/push/pull it and make sure its properly mounted in its spring hangers and not able to contact body/chassis drivetrain parts. Run the engine on the lift/stands and see if you can make the noise happen.
BC
BC
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Joined: Apr 2023
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From: Windsor, CT
Noise transfers very easily under a car. Something that bangs/rubs in the rear can transfer noise up the torque tube and drive you crazy looking for noise on the engine bay.
With that said, sounds like something is leaning to the left when you take a right turn. If you have headers, check to make sure they aren't rubbing your steering shaft. Also that they aren't hitting the left side of the frame.
Triple check all your exhaust hangers and clamps. Check all your fuel and brake lines ( hard and flex) to make sure they aren't loose and rattling.
Driveshaft banging around in the Torque Tube possibly, but hopefully not.
With that said, sounds like something is leaning to the left when you take a right turn. If you have headers, check to make sure they aren't rubbing your steering shaft. Also that they aren't hitting the left side of the frame.
Triple check all your exhaust hangers and clamps. Check all your fuel and brake lines ( hard and flex) to make sure they aren't loose and rattling.
Driveshaft banging around in the Torque Tube possibly, but hopefully not.
Pro
Joined: Apr 2023
Posts: 670
Likes: 358
From: Windsor, CT
Torque Tube I think would be more RPM related or constant. I just threw it out there as an idea. I would check things that are suspended first, like fuel and brake lines, Exhaust. Would be easy enough to check ball joints, tie rods, sway bars while you have it on the lift.
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Thread Starter
Pro
Joined: Aug 2003
Posts: 584
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From: Louisville
checked everything and only thing I found was sway bar bushings are very worn...could that be it? The end links were already replaced less than 500 miles. I'm just lost right now!
Thread Starter
Pro
Joined: Aug 2003
Posts: 584
Likes: 116
From: Louisville
Something is rattling or vibrating once my 1998 MN6 warms up. It usually starts after the first right hand turn, usually on the highway, and/or once I get on it and the RPMs are up. Sometimes it stops once I straighten out the steering wheel but more times than not it becomes constant upon acceleration. I feel like I've checked everything and nothing is loose. There was some play in the motor mounts so I replaced both of those. I am completely stumped...I searched the forum but really didn't find an answer to this. Thanks in advance.