Piston Slap: That Ecoboost Turbocharger Whine?

Matt writes:

Hi Sajeev,

I wrote to you a few years ago regarding a water leak in the moonroof of my old 2010 Ford Fusion. I traded that car in 3 years ago on a brand new at the time 2015 Fusion Titanium with the 2.0 Ecoboost and AWD.

I have had this car for 3 years and just rolled over 100,000KM with it. My issue is that under hard acceleration from a low speed or a stop there is a whining noise that sounds like its coming from the front of the car. The whining noise sounds like the whine a supercharger makes. If i accelerate gently there is no noise and if I floor it on the highway there isn’t a noise I can hear either.

It seems to be only a low speed thing and heavy on the throttle that recreates it.

I took the car to the dealership last week while it was under warranty and they claimed it was the turbo and replaced the turbo and a number of associated parts. The car is still making the noise under the same conditions and now my warranty is done. I’ve googled the issue and been on the Ford forums and couldn’t find anything related to the noise i’m experiencing.

Any idea why my turbocharged 2.0 Ecoboost sounds like a supercharged engine?

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