Piston Slap: That Ecoboost Turbocharger Whine?

Sajeev Mehta
by Sajeev Mehta

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?


Sajeev answers:

Supercharger whine is a delicious thing, not so much when its turbocharger whine.

My initial feeling was that the source is a loose turbo plumbing somewhere between the air filter and the throttle body. That’s because higher engine loads/boost levels cause stresses in forced induction plumbing not seen at lower throttle inputs, causing the loose piece to break its “seal” with the rest of the system. Usually that leak causes performance issues, as boost flies out of the system and throws the anticipated air/fuel ratio out of whack. Not so here!

My best guess? There’s a body plug (AKA grommet) either missing or improperly installed: more likely if you put an aftermarket amplifier power wire (i.e. an old school amp, not the digital ones that are easy on power requirements) using a factory grommet to feed the wire past the firewall. It’s a long shot if you’re running a stock stereo, but still worth putting the Fusion on a lift to verify!

What say you, Best and Brightest?

[Image: Ford]

Send your queries to sajeev@thetruthaboutcars.com. Spare no details and ask for a speedy resolution if you’re in a hurry…but be realistic, and use your make/model specific forums instead of TTAC for more timely advice.


Sajeev Mehta
Sajeev Mehta

More by Sajeev Mehta

Comments
Join the conversation
2 of 26 comments
  • Cimarron typeR Cimarron typeR on Jun 21, 2019

    Fusion, thanks for the follow up. I love this segment but sometimes we're left hanging on what happens after we post our 2 cents (or less) Congrats on the 6!I guess you should change your user name.

  • Cbrworm Cbrworm on Jul 02, 2019

    I know it's long gone, but I would suspect transaxle gear noise.

  • Mia Hey there!I recently stumbled upon the Crack Eraser DIY Windshield Repair Kit (check it out here: https://crackeraser.com/collections/diy-windshield-repair-kits) and decided to give it a shot on a small chip in my windshield. I have to say, it worked like a charm! Super easy to use, and it saved me a trip to the professionals. If you're dealing with a similar issue, this kit is definitely worth considering. 😊
  • Rust-MyEnemy Whoa, what the hell is wrong with Jalop1991 and his condescension? It's as if he's employed by Big Plug-In or something."I've seen plenty of your types on the forums....."Dunno what that means, but I'm not dead keen on being regarded as "A type" by a complete stranger"" I'm guessing you've never actually calculated by hand the miles you've driven against the quantity of gas used--which is your actual miles per gallon."Guess again. Why the hell would you even say that? Yes, I worked it out. Fill-to-fill, based on gas station receipts. And it showed me that a Vauxhall Astra PHEV, starting out with a fully charged PHEV battery, in Hybrid mode, on my long (234-mile) daily motorway daily commute, never, over several months, ever matched or beat the economy of the regular hybrid Honda Civic that I ran for a similar amount of time (circa 5000 miles)."You don't use gasoline at all for 30-40 miles as you use exclusively battery power, then your vehicle is a pure hybrid. Over 234 miles, you will have used whatever gas the engine used for 200 of those miles."At least you're right on that. In hybrid mode, though, the Astra was using battery power when it wasn't at all appropriate. The petrol engine very rarely chimed in when battery power was on tap, and as a result, the EV-mode range quickly disappeared. The regular hybrid Civic, though, deployed its very small electric reserves (which are used up quickly but restore themselves promptly), much more wisely. Such as when on a trailing throttle or on a downward grade, or when in stop-start traffic. As a result, at the end of my 234 miles, the Civic had used less gas than the Astra. Moreover, I hadn't had to pay for the electricity in its battery.I look forward to you arguing that what actually happened isn't what actually happened, but I was there and you were not."Regardless, that you don't understand it appears not to have stopped you from pontificating on it. Please, do us all a favor--don't vote."You really are quite unpleasant, aren't you. But thanks for the advice.
  • Tassos Jong-iL Electric vehicles are mandated by 2020 in One Korea. We are ahead of the time.
  • 1995_SC Can you still get some of the tax credits under the new program?
  • Analoggrotto HyundaiGenesisKia saw this coming a long time ago and are poised for hybrid and plug-in hybrid segment leadership:[list=1][*] The most extensive range of hybrids[/*][*]Highest hybrid sales proportion over any other model [/*][*]Best YouTube reviews [/*][*]Highest number of consumer reports best picks [/*][*]Class leading ATPs among all hybrid vehicles and PHEVs enjoy segment bearing eATPs[/*][/list=1]While some brands like Toyota have invested and wasted untold fortunes into full range electric lineups HyundaiKiaGenesis has taken the right approach here.
Next