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Old 11-29-2013, 03:40 PM   #1
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PLEASE HELP! Incredible "death wobble"

I have a 1994 fbody with the 3.4l v6.

My car has started intermittently violently shaking at any speed. It seems to occur most often at 30mph to 45mph. I very recently (within the past 5 days) have had my tires replaced. Any thoughts on what could be causing this?


the shaking stops and the car acts like normal once I have come to a complete stop.


edit:: sorry for this being my first post but I need to gauge the issue
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Old 11-29-2013, 03:49 PM   #2
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motor mount maybe?
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Old 11-29-2013, 03:51 PM   #3
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Of it started after the tires were replaced I would say either an unbalanced tire or loose lug nuts on a wheel.
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Old 11-29-2013, 03:56 PM   #4
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Yeah it started within the first thousand miles of the tire replacement.

As for the motor mounts, where are they and can I check them without it lifted?
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Old 11-29-2013, 04:18 PM   #5
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Seems pretty obvious that it has to do with the tire install so I wouldn't even start looking at motor mounts until you look at the tires. If you had a shop put the tires on for you, go back to them and tell them they need to fix the problem (they should not charge you for it since it was a poor install in the first place). If you tried to install the tires yourself and do not know how to balance them, then there is your problem; take it to a tire shop to have the tires properly balanced and mounted.

Before driving it any further, follow Navyvet's advice and check the lugnuts. If they are loose or missing already it may be unsafe to drive your vehicle.
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Old 11-29-2013, 04:24 PM   #6
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I had the tires mounted/balanced professionally. I do not have the comfort level or tools to do it with my car on my own, unlike my motorcycle. I want to believe it was a bad install but the shaking was so incredibly violent that I felt the need to see if it was something anyone else had experienced.

edit: I will go outside to check my lugnuts soon
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Old 11-29-2013, 07:10 PM   #7
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I have had similar problems. I have had loose lug nuts, and, I have had unbalanced tires. Both can cause the problem you described. My wife had a Chevy Equinox once, it had a serious vibration when driving at highway speed that got worse on braking. It was caused by a moron that didn't put a torque stick on his impact wrench when he put the new tires back on the vehicle. He had them so over tightened that I snapped a breaker bar trying to remove the lug nuts. I ended up having to take it to a heavy truck shop where they had a 3/4 inch drive impact wrench that had enough power to remove the wheels. It was so tight I am suprised it didn't snap the lugs. I did have to replace the hub assemblies though.
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Old 11-30-2013, 10:36 AM   #8
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Yes check your lug nuts and make sure your wheels arent loose. I think the book says 100lb/ft of torque to the lug nuts.
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Old 11-30-2013, 10:55 AM   #9
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Quote:
Originally Posted by 94z28 View Post
Yes check your lug nuts and make sure your wheels arent loose. I think the book says 100lb/ft of torque to the lug nuts.
100 ft lbs is correct
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Old 11-30-2013, 11:49 AM   #10
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It is odd that it happened closely after new wheels. Definitely check lug nuts and all that, but your car does have the 2 piece drive shaft. Does the car shake at that speed and continue to shake until you stop? Or it stops shaking once you go under 30ish
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Old 11-30-2013, 12:11 PM   #11
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Quote:
Originally Posted by ibanezz View Post
Does the car shake at that speed and continue to shake until you stop? Or it stops shaking once you go under 30ish
Here's what he said in his first post.

Quote:
Originally Posted by ZZRJo View Post
the shaking stops and the car acts like normal once I have come to a complete stop.
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Old 11-30-2013, 12:18 PM   #12
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Sounds like a caster / strut issue if it doesn't go away until he stops.
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Old 11-30-2013, 08:07 PM   #13
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Violent shacking could be caused my many things like most of the previous posts check the lug nuts. It could also be caused by a defective tire or caused by the shop over inflating the tire (it is possible for excessive pressure to brake the cords in the tire). It could also be a wheel bearing, or tie rod, have the shop check it out seeing as how it happened after they installed the tires.
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Old 12-02-2013, 09:45 AM   #14
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It was the drive shaft. It broke completely free and almost impaled me the night I made that post. I have since junked the car.
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Old 12-02-2013, 10:01 AM   #15
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I *just* saw this and immediately thought driveshaft since those years had a shitty 2 piece driveshaft. 1 piece driveshafts are less prone to catastrophic failure and are a direct swap.
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Old 12-02-2013, 06:57 PM   #16
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Bam called it. Sorry to see you got rid of the car. What happened exactly?
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Old 12-02-2013, 07:07 PM   #17
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Driveshaft nearly impaled you? More details plz.
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Old 12-02-2013, 08:19 PM   #18
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Driveshaft nearly impaled you? More details plz.
and pictures!
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Old 12-02-2013, 09:56 PM   #19
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^^^ lol. Oh go get your fix from rotten dot com.

This sounds terrible. Sorry it led to you junking your car.
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