Extreme vibrations under load from 50 mph and above

[Alucard136]

This is a new trend based on my old but the problem have changed to the extreme and i really need help.

http://www.audizine.com/forum/showth...-my-vibrations

For the past 50k miles i been having vibrations in my steering wheel, pedals, seats and vibrations moving randomly around the car. Sometimes i felt like its coming from the front, sometimes from the rear. The vibrations occurred above 50-60 mph and were quit intense. Sometime i could feel it below 60 mph but than the steering wheel did not shake. It were not related to rpm, only to speed.


Anyhow, now it have become much worse. I can feel it in all speeds but above 50 mph everything starts to shake violent. Its undriveable. Above 50, the steering wheel shakes left to right, the gear stick shakes all over the place, i feel the engine, gearbox, and main drive shaft shaking and vibrations feels like they are coming from the back. Above 50 mph it only shakes violent when i use any throttle, if i let go of the throttle, the vibrations decrease to almost nothing and vibrates as before in steering wheel and pedals.

So violent vibrations above 50 mph shaking the either car but only when the throttle is being used.
The car runs perfect in all other aspects, i feel no loss of power during vibrations.

I have replaced the following parts and i need ideas:

Tons of alignments and balancing
New tiers
New wheels
New Wheel hubs & bearing in front
New brake discs in front
New CV axels in front
New main drive shaft
New left CV axel, rear. Going to replace right next week.
All control arms and tie rods are replaced in front including end links.
New engine mounts
New snub mount
New trans mount
New oil, plugs, and camfollower 2 weeks ago.

The only thing i can think of is the right rear cv axle that im about to replace and the rear wheel bearing. Since i've been working with these vibrations for the past 50k i dont think its the diffs or anything in the gearbox since that should have crashed by now or what do you guys say?

[JayDog747]

Do you still have the original shocks?

[Alucard136]

Yes, oem s-line shocks. They feel good while driving and i drive hard in the corners. When rocking the car while standing still it do not bounch about. Do you think they are shot? How do i examine more closely?

[dalmation53]

Wheels bearings and rear Cv axles are toast. that's only the last thing to replace. when my car had 1 cv axle was bad in the front the car rode like shit. then replaced it and brand new again. so you might have multiple things that are worn out or not tight.

[JayDog747]

You can throw the bounce test out, these are not the barges of the past. It's been my experience that shocks only last 50-70k(miles) at the most. Unless there is a catastrophic blow out, shocks go out so gradually that most people don't notice. If you have ever driven these cars from when they were brand new, you would notice the difference.

Here is what you said in 2014 when you had 80k on it:


The vibrations comes mostly in the steering wheel making the wheel bounce up and down, sometimes a lot, sometimes less. Sometimes i feel the vibrations in the driver seat, the floor and the gas pedal. It feels like when the wheels are out of balance but worse. Like something is spinning or moving up and down in an unbalanced way.

You now have what...130k miles and it's getting worse. You've replaced everything else, you might as well go for the full Monty. Also, I didn't see anything in the threads about if you replaced the rear upper control arm bushings. It's cheaper to have them pressed in than to replace the whole arm.

[Alucard136]

Ive had the car since almost new. But now when we talk about it i have experienced some loss of stiffnes i the corners and lately before the vibrations went wilde i did experience a wierd under and oversteer, turning more or less than i expected in relation to the steering wheel.

Im going to replace the axle since i already have it. Do you guys think its possible for bad wheel bearings to shake the entier car?

If im going to buy new suspension. Which are recommended. I would like to be a little stiffer than sline shocks and perhaps a little lower but not so low that i need new upper arms. Max 1000 usd

[krewbrew]

I had a similar extreme vibration problem recently and it ended up being the driveshaft. Vibration made the car barely driveable over 45 mph, more so when accelerating. I know you mentioned you had replaced it already, but I am not sure how long ago or if you replaced it new or used.

[Alucard136]

It were a used drive shaft. About 10k miles ago