Vibration under acceleration

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Nov 16, 2009 | 03:06 PM

dme123

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Vibration under acceleration

Hi all
Since getting my S type a couple of weeks ago (54 plate diesel) I've noticed a vibration under light to medium acceleration from about 30mph / 2000 RPM upwards, but strongest around 2000RPM. Seems worse under quite gentle acceleration and is often not noticeable at all when accelerating hard. At a steady speed there is no vibration at all. The car is otherwise very smooth and vibration free. I've had a good search of the forum and can't find anything. Any advice on what to look for gratefully received!

Edit - just to add, it feels very much like when you have a rear wheel miles out of balance, but is not there at a steady speed as I would expect to be the case in this scenario.

Regards,

Dave

Last edited by dme123; Nov 16, 2009 at 04:22 PM.

Nov 17, 2009 | 06:02 AM

JOsworth

Veteran member

Joined: Jan 2009

Posts: 3,390

Likes: 195

From: Akron, Ohio USA

Have the drive shaft and carriers checked.... My cousin's 535i did that. It also displayed a shudder when cresting a hill during spring unload. The dealer inspected his drive line and rear diff. Changed the carrier bearing and rebalanced the drive shaft and all was fixed. That was a week after buying it new in 2001 and the problem never came back.

Nov 30, 2009 | 03:54 AM

dme123

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Posts: n/a

Hi All
Just to let you know, for reference in case anyone else has this problem, that after much jiggling of suspension components and driveshafts this has been diagnosed as a torque converter failure! Turns out that a new (remanufactured) one is not all that expensive, but the six hours of labour is. Luckily it's under warranty!

Regards,

Dave