High Pitch Whinning Noise when Accelerating

[Ottatai]

Hi guys,

Recently my F10 520i makes high pitch Whinning noise when accelaring. Mechanic told me my turbo is fine but he changed the vacuum pump, a valve and ignition coils with plugs as well. However the noise is still there. It's getting annoying. Anyone had experienced this before? Thanks in advance!

 

[pierreye]

You better check your timing chain rail. All n20 before manufacturing date 3/2015 might have problem the plastic rail broken.

 

[Ottatai]

You better check your timing chain rail. All n20 before manufacturing date 3/2015 might have problem the plastic rail broken.

Does it means that newer model has no plastic rail? Or has it been replaced with other material?

 

[gendong]

Plastic rail is still being used. quality of the plastic should have been improved on newer variants.

 

[alantiong]

The only think that gives a high pitch whine is the turbo.. if it's ok.. it's ok. If there is not lag n loss of power . I reckon it's ok. Both my 320d and 730d also has whinning noise.. so is my ranger..

 

[Ottatai]

The only think that gives a high pitch whine is the turbo.. if it's ok.. it's ok. If there is not lag n loss of power . I reckon it's ok. Both my 320d and 730d also has whinning noise.. so is my ranger..

Found the culprits... Turbo and rear differential and got them replaced.