Hi all

hopefully this is the correct place to post this.

My mark 2 superb with dsg gearbox has just developed an intermittent rumbling while accelerating over 50 mph that you can feel through he floor of the car.

The problem only occurs while I'm accelerating, as soon as I take my foot off he gas the rumbling stops and starts again when I accelerate again.

The problem only started after I had new tyres fitted and tracking corrected. I've had the tracking and balancing double checked and this is fine.

I've taken it to a VAG specialist garage where they've checked suspension, bearing, csv joints and run diagnosistics checks but they can't find anything wrong.

Does anyone have any ideas what could be wrong?

I know this may be simplistic but it might be a tyre rumble. I had a similar issue on my previous car (a Vel Satis) when I replaced all tyres. At around 40/45mph there was a real rumble and I thought it was a wheel bearing. But when the winter tyres were on it disappeared...And at 70mph on the summer tyres the rumble disappeared. Weird.

All that said, if you are getting juddering and possibly a burning smell check brakes and the DSG again

It's quite likely to be the tyres from what you describe especially as you've just had new ones fitted and it only occurs above 50mph accelerating which was almost identical to my issue before . I had this on my first set of tyres (from new) and turned out there was saw tooth damage causing lots of uneven wear which got progressively worse over time. It wasn't apparent though on initial inspection so I'd advise you to insist that the tyre fitters take a proper look and don't fob you off!

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If it was ok before the new tyres were fitted and now you have a problem it could be a tyre manufacturing fault somewhere within the carcass which you cannot see. The only way to tell would be to change each wheel in turn with the spare and see if it makes a difference. Time consuming and a bit of a pain, but at least you'd know. 

 

Did the same place double check the tracking or did you take it somewhere else?, they may have made a mistake and not realised.

 

There is always the chance it has nothing to do with the tyres or tracking at all and another problem has just appeared by coincidence at the same time.

Yes same place checked balancing and tracking.

Could it be tyres if it only happens when accelerating and not when coasting?

Wouldn't it happen all the time over a certain speed?

Garage thought it could be transmission related but couldn't find anything

I had one 'rouge' tyre on my Superb FL and that began to make the car shake under power, cruising along it was smoother but had a lot of rumble on smooth surfaces. Tyres can do funny things, try the spare on each corner and see if it makes a difference. 

Hi guys

I'm getting the tyres changed tomorrow so I'll keep you posted.

I swapped the tyres round (front to back) on Sunday and this has made things worse.

Hopefully this resolves the problem as he garage are out of ideas oherwise