Interior Vibration ...Irritation SOS

[S14ED]

Mercedes 250D AMG Premium Plus Line (64Reg)

I have now got to the point where if I do not sort this problem out I am going to do something drastic!
I have a vibration which was not there when I got my MB in Autumn of last year.
Now I have 2 problems which I need to resolve as it is driving me insane!!
1) Vibration coming from the Dash when I push on the Gas pedal and the speed rises from 20-30Mph. Plus also on the Motorway no major high speed but the Vibration comes and lasts constantly till I take my foot of the Gas Pedal.

Second problem - If the Vibration was not enough

2) Opened my drivers side window (weather finally being good) and hear a slight metallic rattle beneath my side of the car. Is it the exhaust is it something else who knows the secret?!

I do have a One year Warranty (5 Months to go) and I have booked my car in with the local Mercedes Dealers. Their technician did drive my car a mile or so and like a child getting better in the docs surgery it was not there! However they have agreed to check Engine Software and update it if required. But I think the whole exercise will be a waste as I do not think this will eradicate the problem (sorry to sound pessimistic) but can anyone help?

 

[Scotty1]

I have this same accelerator pedal vibration ,like a pulse in the pedal at anything over 70mph tried tracking wheel balancing and even 17inch sport wheels instead of original AMG wheels , very annoying

 

[rf065]

No vibration problems on mine, but the metallic rattle could be a heat shield on the exhaust?

 

[Scotty1]

I've read these cars are very sensitive to wheel balancing, I'm going to try road force Ballance tomorrow before I start digging in to bearing or bush problems

 

[kid-jensen]

When you say "Vibration coming from the Dash", do you mean a rattle from the dash, or is there some mechanical vibration somewhere in the car that you hear from the direction if the dash?