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I've noticed for sometime that my car is making a strange noise when accelerating, like metal plates scratching or something like that. You can listen it here:

What do you think it is?
 

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2007 E320 Bluetec, 2008 320ML CDI
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Likely associated with the serpentine belt. Tensioner and pulleys.

If you DIY a useful check is to remove the belt and run the engine for a short time. If the noises disappear then check all of the items the belt runs on.

Skippy


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If u feel vibrations then engine mount.
Testing:apply parking brake selector in D,open the hood and gently apply gas pedal.if engine comes out a lil a bit thats left side mount to blame.
For the right side put gear selector in R.
Otherwise it should be belt and tensioner case
 
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