Focus 1.0 Ecoboost strange noise

[Jdgr87]

I’ve just noticed my 20 plate Focus has been making a noise I don’t think I’ve heard before. It seems to happen when I rev the car gently and then lift my foot off the accelerator. I can also hear it if the car is cruising. I’ve searched this forum for something similar and found the below video which is the exact same thing I’m experiencing but I couldn’t see anyone had replied. 

I also heard another 20 plate Focus make the exact same noise in a petrol station the other day. 
Any ideas or suggestions? Hoping it’s just normal! 

https://photos.app.goo.gl/SfB6bpmDG8x9Snei7

 

 

[Bol]

Perhaps it is because of the cylinder. The cylinder deactivates sometimes. So during acceleration it is reactivating.

 

Did you notice something unusual about performance or any other thing?

[Jdgr87]

3 minutes ago, Bol said:

Perhaps it is because of the cylinder. The cylinder deactivates sometimes. So during acceleration it is reactivating.

 

Did you notice something unusual about performance or any other thing?

Thanks for your reply. Nothing unusual with performance and I can only hear it with the window open. It’s nice and quiet in the car. 
It seems to be when the revs are settling that it’s making the noise, so when lifting my foot off the accelerator. 
After reading all the horror stories about these engines i think im just abit paranoid. 

[Bol]

I am not sure.

But perhaps thats the explanation.

[TomsFocus]

That noise is the recirculation valve venting back into the inlet when the throttle is released.  Completely normal operation.  

[Jdgr87]

3 minutes ago, TomsFocus said:

That noise is the recirculation valve venting back into the inlet when the throttle is released.  Completely normal operation.  

Brilliant! Thank you for putting my mind at rest!