Q: "Fluttering" noise under heavy throttle/boost

asked by on

While driving the car slowly the noise does not occur unless I'm on the highway and in 5th gear under acceleration. But when I step on it, I can hear it right away from 1st gear to 6th as long as my boost is under load, and throttle is pressed down. From my novice UTI schooling, I'm thinking wastegate, D-valve, or something else, I'm not sure honestly. it sounds like a flutter but instead of hearing it after you let go of the throttle you hear it while giving it power and boosting

My car has 8000 miles.
My car has a manual transmission.

Hello, thanks for writing in. If this occurs only under this high load condition then most of the time it is caused by a boost leak. I usually suspect that the intercooler has a crack as that will cause this noise. I also would check the exhaust fittings to the turbo and the intake tubes. If those are fine then it very well could be the wastegate not sealing or an issue within the turbo, but both of those will usually cause a power loss. I recommend having one of our certified automotive technicians from YourMechanic come to your home or office to inspect, diagnose, and repair the issue.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. "Fluttering" noise under heavy throttle/boost

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I have a 2015 wrx, my AC compressor pulley spins a few seconds then stops for a few then repeats, and makes an odd sound.

The cycling of the AC compressor is normal as the compressor cycles on and off. You may also hear a bit of a change in the exhaust as this happens. The computer will automatically compensate for the additional load the...

Q: Q: Exhaust system

The sound of the exhaust is not determined by whether it is a turbo-back, or a cat-back system. The determining factors for the amount of sound that comes from a given system are the size of the piping being installed,...

Q: Q: Power steering

Hi There, This may be related to a failing power steering pump or low power steering fluid levels. As you may know, the power steering system uses a pump, normally driven by a belt. The pump supplies pressure as it...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...