Loud whistle/screeching noise

Wilko150

New Member
Joined
Feb 29, 2016
Messages
5
Car
cls500
Hi
Recently bought a cls500 on a 55 plate.
Around 4000rpm at full throttle it starts to make a whistling noise. I can only really hear it with the window open. By the time it gets to 6000rpm + the noise is so loud it becomes unbearable. First i thought it was a belt slipping, changed auxiliary belt and tensioners but made no difference. Anyone have any ideas? Thinking it may be a small exhaust leak. Only makes the noise at full throttle.
 

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