Vibration under hard acceleration ?!
Thread Starter
Burning Brakes
Joined: Dec 2007
Posts: 754
Likes: 2
From: Redondo Beach California
Vibration under hard acceleration ?!
Hello guys,
Recently ive picked up some nasty vibration under hard acceleration Its comes when im pinning 2nd or third gear from 3.5k to redline. I can really feel it in the shifter and the car almost feels like it has light wheel hop.
I inspected the tranny and motor mound with the car on stands but theres no real noticeable signs of damage. I know they could still be bad around the top where i cant really see but do you think this is it?
Again, it happens under hard acceleration only.
Recently ive picked up some nasty vibration under hard acceleration Its comes when im pinning 2nd or third gear from 3.5k to redline. I can really feel it in the shifter and the car almost feels like it has light wheel hop.
I inspected the tranny and motor mound with the car on stands but theres no real noticeable signs of damage. I know they could still be bad around the top where i cant really see but do you think this is it?
Again, it happens under hard acceleration only.
Le Mans Master
Joined: Jan 2001
Posts: 6,449
Likes: 371
From: Maryville TN
St. Jude Donor '06-13,'16-'17, '19
To check for motor mounts, block all 4 wheels then have someone rev the engine and release the clutch SLOWLY. If you have a broken motor mount, the engine will rise up out of the cradle an unusual amount. You'll see right away that the engine is not secure to the frame.
Tom
Thread Starter
Burning Brakes
Joined: Dec 2007
Posts: 754
Likes: 2
From: Redondo Beach California
Clutch slip sometimes doesn't smell under hard acceleration if it is just skipping on the pressure plate. (warped pressure plate)
To check for motor mounts, block all 4 wheels then have someone rev the engine and release the clutch SLOWLY. If you have a broken motor mount, the engine will rise up out of the cradle an unusual amount. You'll see right away that the engine is not secure to the frame.
Tom
To check for motor mounts, block all 4 wheels then have someone rev the engine and release the clutch SLOWLY. If you have a broken motor mount, the engine will rise up out of the cradle an unusual amount. You'll see right away that the engine is not secure to the frame.
Tom
Thanks, I will try this tomorrow
Thread Starter
Burning Brakes
Joined: Dec 2007
Posts: 754
Likes: 2
From: Redondo Beach California
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Thread Starter
Burning Brakes
Joined: Dec 2007
Posts: 754
Likes: 2
From: Redondo Beach California
Did a lil searching on clutch balance. Sounds possible. Ive got 42K on it and have had no clutch work. Do you think a clutch could just go out of balance like that?
Thread Starter
Burning Brakes
Joined: Dec 2007
Posts: 754
Likes: 2
From: Redondo Beach California
OK, not the clutch. I changed the shifter bushings, although it did need em it still does it. Its not the motor mounts. Any other bushings back there? Torque tube, half shafts??
Pro
Joined: Aug 2010
Posts: 748
Likes: 3
it could be the CV's if its only under acceleration. the CV cups sometimes become pitted and vibrate only under acceleration
an easy way to see if thats the problem without spending any $ is to swap the left and right axles (im pretty sure theyre the same on a c6) because it moves the pitted area to the back side of the cup where the bearings inside the cv don't contact under acceleration.
an easy way to see if thats the problem without spending any $ is to swap the left and right axles (im pretty sure theyre the same on a c6) because it moves the pitted area to the back side of the cup where the bearings inside the cv don't contact under acceleration.
Last edited by m R g S r; Nov 9, 2010 at 10:21 AM.
Thread Starter
Burning Brakes
Joined: Dec 2007
Posts: 754
Likes: 2
From: Redondo Beach California
Thanks for the leads guys. Where are the rubber couplings located? Can I check them with the car on a lift? If its not the bushings im gonna swap the axles.
Ill just go down the list untill i find it!!!
Ill just go down the list untill i find it!!!
