[W126 Coupe] Re: Vibration between 45 and 60

[Robert Karl Stonjek]

Itrat

It's worth checking the tailshaft CV joints - a rubber disc affair.  If this is cracked you can get vibration, usually on acceleration, but if the usual suspects come up clean then it might be worth a look.  The usual suspects are:
Tyre Pressure;
Tyre/wheel balance;
Loose steering box (can be tightened to a degree)
Loose/worn tierod ends;
etc.

But if you have new tires, one would expect them to have been properly balanced during fitting.  I did have an odd situation once where a professional fitting resulted in the tyre not being fitted squarely on the rim.  To check this at home, jack the car up until the tyre is just clear of the road, then rotate the wheel and see if the gap between the tyre and road changes.  If it does, even fractionally, then you should have tyres re-fitted.  But most places should inspect all of this if you go back to your tyre fitter and explain the problem - they should check the balance, fitting etc.

If you still have no joy but suspect a particular wheel, try changing it for the spare and see if the problem goes away.

Robert


> Hello,
> 
> I recently had some work done on my car. The work was a regular tune up,
> transmission tune up and replacing the center link of the steering. I also
> had put 4 new Pirellis on the same day.
> 
> Right after this was done, I took a 4 hour drive to Ithaca. The car has
> been acting strange. I could feel some vibration precisely between 45 and
> 60 miles / hour. And it doesn't matter whether I am accelerating or
> decelerating. Do you guys have a sense for what it might be?
> 
> Thanks in advance.
> 
> Itrat
> =================
> 
>  If this is new behavior you can certainly suspect it is one of the things
> that was changed. More than likely tires but Pirellis are usually pretty
> good quality. I am guessing that they forgot to balance one tire or they
> did a bad job balancing all.
>   Is the vibration more pronounced in the steering wheel or the seat?
> If it is in the steering wheel you can narrow the search to the front and
> also suspect an improper installation of the center link.
>   If it is in the seat, it has to be something in the rear tire
> replacement. Tires, balance, lug bolt torque, improper wheel seating on the
> hub, etc.
> 
> Rick
> 
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