Whining sound when reving

[imranc666]

My 2018 Y62 has developed a whining sound when accelerating or reving, looks like its one of the belt pulley bearings, however can't tell which one, can anyone help with part numbers of the pulleys and what would be best way to find which pulley is noisy? Thanks

[jay see]

Sorry can't help on the part numbers.

You sure someone didn't bolt on a supercharger to the donk, whining when revving

Sorry just had too..

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[mudnut]

Is the air conditioning running?

[jack]

Probably best to check the Idler Arm Pulley, I realise it’s a totally different engine but it was a common issue with earlier models.
Is it most noticeable when you first start it up and does it eventually go away? These are the common symptoms.