SLK vibration ideas help?

[Fangio246]

Hi
My wife has a 2013 Mercedes SLK with only 19,000 miles on it.
We have an oscillating vibration which is evident from around 65mph upwards (particularly evident at constant speeds on motorway).
The vibration lasts for around 1.5 seconds, then 1.5 seconds without vibration, then repeat. It is there all the time and doesn't appear to change with road speed.

I have changed the wheels and tyres (going from the standard 18 inch to 17 inch) with no change to the vibration.

The car has passed it's only two MOT's fine, so no evident play in any of the bushes, ball joints etc.

Any ideas?

 

[Uncle Benz]

I've had something similar to what you describe, and it turned out to be a plastic undertray vibrating, due to a missing screw

 

[Fangio246]

Thanks for the suggestion. However, you can feel this through the car, particularly through the small of your back. It feels like it's a moving part or perhaps a shock in some kind of harmonic motion. Be very surprised if it was something like a lose undertray oscillating.

 

[ian groombridge]

Thanks for the suggestion. However, you can feel this through the car, particularly through the small of your back. It feels like it's a moving part or perhaps a shock in some kind of harmonic motion. Be very surprised if it was something like a lose undertray oscillating.

hi there

did you find out what was causing the vibration , i have 2014 SLK and i have exactly the same thing ive already been to garage and had it checked over and they say can not find anything wrong

 

[John Laidlaw]

Welcome Ian, not seen him in a while not sure he has the SLK now actually