Strange Vibrating/Rumbling...

[RSW46]

Something very strange just happened whilst driving my car in town. It's a 2008 A3 2.0 tdi bkd dsg, and as I went off then back on the accelerator, the car started to vibrate like crazy. I couldn't stop fully because of where I was, but it was speeding up and slowing down fine, just vibrating a lot. After about 1/4 of a mile the vibrations stopped and it was fine again. I've done about 20 miles of mixed dual carriageway and town driving and it's not happened since.

I'm very confused by this, also I scanned it with the torque app on my phone and no fault codes are logged.

Any ideas? I only bought it a couple of months ago and it's already had a new turbo... I could do without anything else going wrong.

Thanks

 

[RSW46]

Anyone able to offer any help on this? Got a 450mile weekend coming up :-/

 

[Matt_Storm]

If it does it in neutral as well as drive it sounds like it could be your dual mass flywheel on its way out, if its just in drive then check wheels nuts and wheel bearings by jacking each wheel up and give them a wobble side to side. Otherwise it could have just been a lump of mud stuck to the inside of one of the wheels, i had this once after getting stuck in a field with the vicars daughter.

 

[RSW46]

If it does it in neutral as well as drive it sounds like it could be your dual mass flywheel on its way out, if its just in drive then check wheels nuts and wheel bearings by jacking each wheel up and give them a wobble side to side. Otherwise it could have just been a lump of mud stuck to the inside of one of the wheels, i had this once after getting stuck in a field with the vicars daughter.

Thanks mate, it's very strange because in Neutral and when driving the car is perfectly fine now, it was only for a short period when I had to go out from work at lunch. It seemed to be coming from the front passenger side if I had to try and narrow it down, so I've checked the wheel bearing here and it seems fine. It could have been something that got stuck inside the wheel, but I was driving on a normal road with no vicars daughter so it's a bit strange! I'll have to jack it up and have a proper look when I get a chance. Hopefully it isn't something as serious as the dual mass flywheel...

 

[RSW46]

I'm bumping this thread because the problem came back yesterday! I'm very confused now, any help would be appreciated greatly so I can go back to the dealership I bought it from or the warranty company I'm with...

I had to do an emergency stop yesterday when a Vauxhall Insignia I was following slammed his brakes on to stop at a traffic light which he had plenty of time to get through... I didn't hit him so was obviously glad at that, but when I pulled away this weird problem came back. The whole car was shaking and vibrating as it accelerated. It was only when I went on the power. When not touching the accelerator it was smooth as normal. The vibration was like driving over a rumble strip, so shaking the whole car. It felt like it was localised to the middle of the dash, so maybe at the back of the engine? Hard to tell though really.

It was only in Drive that this was happening, in Neural, Park and Reverse it was revving perfectly fine.

It carried on like this for a couple of miles. I was in central London so couldn't stop as the road had double red lines and I didn't want a ticket too!

It eventually stopped doing this and driving fine again when I went over a speed bump... It's been fine ever since! I'm so confused... Any ideas? I still have a month of warranty left from the dealer I bought it from and want to get it resolved in this time, but as it's intermittent I can see it being a world of pain.

Thanks all

 

[pluves1]

It's a bit of guesswork as I've never experienced this in our S3. If you've checked the wheels and also the inside of the alloys for stones etc my next stop would be the brakes based purely on your latest post. Could one be sticking?
Once brakes are ruled out then you're onto the DSG. This is covered in greater detail here with what sounds like the same issue that you're having.
http://www.audi-sport.net/xf/thread...ion-problem-dsg-2-0-tdi-advice-needed.147611/

 

[RSW46]

It's a bit of guesswork as I've never experienced this in our S3. If you've checked the wheels and also the inside of the alloys for stones etc my next stop would be the brakes based purely on your latest post. Could one be sticking?
Once brakes are ruled out then you're onto the DSG. This is covered in greater detail here with what sounds like the same issue that you're having.
http://www.audi-sport.net/xf/thread...ion-problem-dsg-2-0-tdi-advice-needed.147611/

Thanks for the reply! I'm really not sure what it could be. The problem in the thread here sounds similar but it's not the same in that mine was doing it in every gear and from the bottom of the rev range, not just around 55/60mph.

Also confusingly, when in N it was rolling along fine, so this would point me away from the brakes, although I did initially think it could have been one sticking.

One more thing to add, when it was playing up, I turned the engine off and on a couple of times and it struggled to start a bit, like it wouldn't quite catch, it took a few more seconds than normal and started up in stages.

I'm still very confused. I know it shouldn't be doing this but I also know the dealer is just going to deny that anything is wrong because it's driving fine now.

Thanks again

 

[ryan-westlondon]

I have a rumble/vibrating when going in second gear, bringing into Audi this Friday. Apparently mine is most likely to be the clutch pack according to identical reports on VW/SKODA about their DSG:

http://www.audi-sport.net/xf/threads/fao-7-speed-s-tronic-owners.225331/#post-2246530

One VW guy said he was told that dust accumulates in the clutch pack, accumulating between the plates developing into hard lumps causing shudders. VW came up with an improved clutch pack that minimises dust retention between the plates. It can cause some issue with the dual mass flywheel aswell, I'll be mentioning all this to Audi on friday.

 

[RSW46]

I have a rumble/vibrating when going in second gear, bringing into Audi this Friday. Apparently mine is most likely to be the clutch pack according to identical reports on VW/SKODA about their DSG:

http://www.audi-sport.net/xf/threads/fao-7-speed-s-tronic-owners.225331/#post-2246530

One VW guy said he was told that dust accumulates in the clutch pack, accumulating between the plates developing into hard lumps causing shudders. VW came up with an improved clutch pack that minimises dust retention between the plates. It can cause some issue with the dual mass flywheel aswell, I'll be mentioning all this to Audi on friday.

Sounds like it's similar, but my car is an older model than yours with the 6 speed DSG which has a wet clutch i believe and yours is a 7 speed with a dry clutch, so I'm not sure if the problem would be the same.

Are there any DSG or BKD engine/DMF specialists on here who might be able to shed some light on it? The car is booked in with the dealer on September 10th for him to have a look at it, but my main concern is that he's just going to tell me it's fine as it's driving okay now. If I can give him some sort of professional opinion on it I'll hopefully have more chance of him looking in to it further.

 

[RSW46]

Spoke to a DSG specialist this morning and described the problems to him. He didn't seem to think it was a gearbox problem, and suggested that it could be the driveshafts? It makes sense I suppose that the sudden braking would cause the problem, and then going over a speed bump might cause it if it was a drive shaft problem. Does this sound viable to any of you guys?

It doesn't explain why it would be difficult to start though when I stopped at traffic lights, which was only happening while the problem was present. It started very rough, but got there eventually. It's now cleared up as has the vibration issue. He suggested this might be down to the fuel filter?

Anyone have any comments on this advice? I'm so confused... I thought Audi ownership would be a joy but so far it's a bit of a hassle haha.

 

[RSW46]

Problem solved! The DSG Gearbox mount cracked, causing this noise whenever it was under extreme load like heavy braking etc. If anyone else has a problem like this I'd give the gearbox mounts a check before you go worrying yourself about big problems like I did!

 

[Dan-Jnr]

Great to see its fixed, for less too.

 

[RSW46]

Great to see its fixed, for less too.

Cheers mate, here's a pic of the offending bracket! Surprised this happened to it, a bit worrying really. I just hope I don't have any more troubles with it.