Clk 320cdi engine noise

[m1_jdh]

My car appears to have developed an unusual noise.

If you rev the engine when stationary (and up to temp) as the engine winds down a roar sound occurs which sounds a bit like a jet engine and seems to emanate from the air scoops (at least this is where the sound appears to be the loudest).

I'm sure noise hasn't always been there, can anybody help me with the possible diagnosis please?

Thanks

Matthew

 

[m1_jdh]

Anybody please?

 

[m1_jdh]

Is this a turbo problem?

 

[Gooner1]

Are you sure it is not just the electric fan coming on when reaching temperature?

 

[m1_jdh]

No, definitely not the fan, only occurs when the engine is revved and on the 'downward' wind...

 

[chrissot]

Hello guys! New to the country and new to the club as well. I have the same problem with my clk 320cdi. Did you actually find out what was this sound ?

 

[gilbert121262]

probably the EGR Valve opening and closing