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Odd shaking/rocking/vibrations in A4 Cab


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Hi, All. Some advice appreciated from the techno-savvy.

I have a new A4 cabriolet, 2.5 TDI. It's been working fine since delivery - gruff engine when slow/stationary, but smooth as butter from inside. Suspension is Sports, hard on UK roads but smooth in motion. At least, it was.

Something's happened - gradual onset over the last week or so, and (before you start speculating about scuttle shake in a cabriolet, etc., it's new and wasn't there at purchase)

I first noticed going round tight corners (grid-like residential streets near home) - an unusual amount of rocking - first toward the outside front wheel, then diagonally backward as you straighten up, and then a side-to-side rocking after completing the turn, which lasts a few seconds into the straight. Seemed odd but it's stil new enough that I thought it was just a quirk I hadn't noticed before.

But it's been getting worse and I'm now pretty sure the suspension is slowly becoming 'floatier' - there's more rocking, and road imperfections seem more noticeable. The latter may seem an odd thing to say, but it's not that the suspension has got *harder* - I'm using to feeling a slight thud from firm suspension, but it's always been a smooth-but-hard ride: whereas now, it's almost as if every bump sets off a tiny but perceptible vibration, so that (although the steering and cornering feels 'lighter') the ride actually seems much rougher.

At night, the headlights seem (or is it my imagination) to be swaying up and down more.

What could cause this ? It's a sport suspension, only a few weeks old but done 1200 miles, mainly short trips but with some long outings (been to Briston and back, plus I've been enjoying some long drives around West London, onto the motorways and round, etc.). I've had one or two squealing wheels when over-enthusiastic but I haven't been thrashing the thing overly: and I may have taken one speed bump a little too fast but that was a week ago and nothing seemed wrong afterward.

Any ideas ? Worried now... is it just a matter of checking the tyre pressures or is this something you see with a more fundamental problem ?

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I'm not an expert by any means, so would suggest you pay a quick visit to you local dealer & get them to take a look.

I always try to obtain a diagnosis over the web myself, but can never get anybody to understand the symptoms!!

I've got a Sport (as pretty much all Cab's tend to be) and haven't noticed any variation in the ride or handling as time has gone on.

My work site has a plethora of sleeping policemen to tackle before I get offiste, so I guess I'd be more open to this if it was a general problem.

Told you I wouldn't be much help!!

suicide.gif

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Sorry, nothing here either, although I've got a 1.8T with standard suspension and 16 inch wheels so a bit of a different setup.

Agree with Tony about getting the dealer to look at it, although from experience if it isn't something obvious like a bit broken off then they'll either not notice it or describe it as "within tolerance" I suspect. confused.gif

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Thanks for the replies. I was going to take it in tomorrow to have the (paid-for) Tracker fitted, and they've agreed to have a look at suspension/tyres.

Not sure what I'll do if they say "there, there, nothing wrong" - it definitely feels less pleasant to drive than it used to a couple of weeks back. Can you get second opinions from independent (but Audi recognised) specialists on these things ?

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