On Mon, 28 Jul 2003 19:16:43 -0400, stephens@no-fixed-abode.com wrote:

>My 1998 A6 started to give a vibration while driving straight ahead, at
>speeds above 20 mph. Smooths out a bit above 60, and disappears completely
>in any turn, either right or left. Mileage is 58,000.
>
>Wheel balance is OK.
>
>As well as feeling it in the steering wheel, I can also hear it, as a gentle
>"thumping".
>
>Has anybody experienced this before, and if so, what could the cause be?

Could be:
1) A bent wheel. Bent wheels "appear" to be balanced on the
machines, but not on the car.
2) A worn steering or suspension ball joint
3) A worn rubber bush in a suspension joint
4) Tracking out

Most likely to be 2, 3 or 4 (or a combination), but the bent wheel may
be the root-cause, so get that checked out.
I have a very similar problem on my '98 A6Q (128,000 miles) and the
dealer cannot find the problem. Looks like I'll have to get the jack
out myself!

>************************************************* ****
>Ashley Shepherd
>Consultancy Services
>email to ashley.shepherd@virgin.net
>************************************************* ****

 

Check for play in the front wheel bearings,

Steve.

"Ashley Shepherd" <ashley.shepherd@virgin.net> wrote in message
news:ifgniv42dnodfm407nl7jpqkf4e7oh145i@4ax.com...
> On Mon, 28 Jul 2003 19:16:43 -0400, stephens@no-fixed-abode.com wrote:
>
> >My 1998 A6 started to give a vibration while driving straight ahead, at
> >speeds above 20 mph. Smooths out a bit above 60, and disappears
completely
> >in any turn, either right or left. Mileage is 58,000.
> >
> >Wheel balance is OK.
> >
> >As well as feeling it in the steering wheel, I can also hear it, as a
gentle
> >"thumping".
> >
> >Has anybody experienced this before, and if so, what could the cause be?
>
> Could be:
> 1) A bent wheel. Bent wheels "appear" to be balanced on the
> machines, but not on the car.
> 2) A worn steering or suspension ball joint
> 3) A worn rubber bush in a suspension joint
> 4) Tracking out
>
> Most likely to be 2, 3 or 4 (or a combination), but the bent wheel may
> be the root-cause, so get that checked out.
> I have a very similar problem on my '98 A6Q (128,000 miles) and the
> dealer cannot find the problem. Looks like I'll have to get the jack
> out myself!
>
> >************************************************* ****
> >Ashley Shepherd
> >Consultancy Services
> >email to ashley.shepherd@virgin.net
> >************************************************* ****