Hello. I have a superb caravan, 2011 year, engine 2.0 tdi 103 kw. When accelerating at a speed of about 120km to about 150km, my car shakes the steering wheel, but only when accelerating and when the lowering of the gas stops the shaking stops. We replaced the tires, the rims, the inner wrist of the right hemisphere (this long half axis) replaced the selenium, the hands, the lubrication stabilizer, ... but without success. Did anyone have a similar problem and save it?
Thanks for the help.

Have the wheels been balanced?

Yes. Few times. We replace wheels and tires from other superb and shaking still stay.

Did you complete a wheel alignment (usually done on Hunter units, or similar)?

I dont now on what unit was made alignment? Whay? is it important on what unit made wheel alignment?

Just to check, you know that tyre balancing and wheel alignment aren't the same?

You think wheel optic? Yes we do wheel optic, tyre balancing to.

DSG or manual? Maybe Dual Mass Flywheel - DMF - is the problem? 

Manual gearbox. Vibrations are felt on the steering wheel. 

 

24 minutes ago, maticmatic123 said:

Manual gearbox. Vibrations are felt on the steering wheel. 

 

 

What mileage on the car? Have you checked the steering rack, front link stabilizers?

180.000 km. We replace front link stabilizers and check steering rack and everything is proper.

Driveshaft issue?

Maybe? What can be wrong on drive shaft? 

20 minutes ago, maticmatic123 said:

Maybe? What can be wrong on drive shaft? 

 

One of the joints starting to fail or someone jacking the car up by the driveshaft .

Jack the car up one front wheel off the ground at a time and feel for major play in the joints. Then rotate the wheels and look back up the driveshaft to make sure it doesn't rotate off centre ( I experienced this years ago with a Polo when someone jacked the car up by the driveshaft! - you had to look carefully but a driveshaft wasn't quite straight and it had strange vibrations at certain speeds).

 

These days if I have a joint on the way out I tend to have a whole driveshaft fitted as the cost of the part is more but the labour is less.

 

Edited 20 October, 20187 yr by bigjohn

Inside or outside joints? Right inside joints we replace with new one becouse it was hard to move but bug stay.

 

22 minutes ago, maticmatic123 said:

Inside or outside joints? Right inside joints we replace with new one becouse it was hard to move but bug stay.

 

I would have changed the whole shaft - if one end becomes damaged then it can affect the other end.

 

I had this on a Passat years ago where changing an outer joint helped an issue but the inner one was the root cause as the grease had dried up. In this case the issue was a bad vibration/noise under load at certain speeds. It caught me out in France - got so bad I had to slow to 25mph up a motorway hill and then floor it down a hill to try and make it up the next. Every time I pulled over the issue went away for a short while.

 

 

Edited 20 October, 20187 yr by bigjohn

In my Alhambra forum days it was often worn splines on the driveshaft inner end.

 

Required new driveshafts which were difficult to source.

7 minutes ago, xman said:

Alhambra

 

As in Seat Alhambra?

Yes. 1.9tdi However it may not be relevant, because it had a Ford 5 speed gearbox in those days.

Edited 20 October, 20187 yr by xman

Can be outside joints?  The inside we replace inside right one and left one we again greased. 

The worsening of the vibration under acceleration, and the disappearance under decelaration, suggests to me that it is wear in steering linkage somewhere (possibly in suspension).

 

Good luck in your investigations  - please let the group know the outcome.

3 hours ago, KenM said:

The worsening of the vibration under acceleration, and the disappearance under decelaration, suggests to me that it is wear in steering linkage somewhere (possibly in suspension).

 

Good luck in your investigations  - please let the group know the outcome.

 

Possibly - but it in my case it was a driveshaft that vibrated badly under load/acceleration (On a 1990 Passat not a Superb but driveshaft design was similar). Also @maticmatic123 seems to have changed quite a lot of the steering / suspension and it was mentioned that this inner CV joint was "stiff" - this could have damaged other things on the driveshaft ie the CV joint at the other end.

 

I've been stung by this before hence my policy of always changing the whole driveshaft if any joint is failing. As well as avoiding further future repairs somehow the rubber boots with new shafts seem to last longer than the ones supplied with joint replacements - I think it is because the replacement ones are slightly softer to aid fitting - just a thoery.

 

Also checking whether a driveshaft is slightly bent is failrly easy looking up the shaft whilst rotating it - I've seen loads of people try to jack cars up on the wrong part of the car ie by the driveshaft (bends shaft) or anywhere on the engine / gearbox end of a mount - can damage/tear an engine mounts.

 

I've seen lots of horror stories - usually made worse by the fact I've encountered many cars (not Skoda) at their original end of life before restoration. Don't get me started on the condition of brakes - I've frequently wondered how previous owners of cars are still alive by the state of brake fluid, pipes and parts removed from cars. 

 

PS - I am presuming that the original poster has tried different tyres/wheels although I'm beginning to wonder re reading the original post. A bent wheel could cause major issues. If this hasn't been done on any of the front wheels yet this would be a next step!

Edited 21 October, 20187 yr by bigjohn

For acceleration shaking it is usually wrong  internal homokinetic joints. It usually breaks in the long half-length ..... Does it make sense to change both  inner joints at the same time or is it usually only one defective? In what kind of area does deformation of the joint occur?

Please feel free to use Google translate instead of the venusian bable fish

@xman -