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: Feels like front right tire has vibration when turning left or merging lanes to the left at highway speed only. Bearings are okay

Hello, thanks for writing in. If the bearings are fine then the tires need to be checked first. If there is any uneven wear then this will occur. If the tires are all fine then the hubs need to be...

Q: Fuel pump fuse overheats

If you have changed something in the system recently, that may be the cause. Otherwise, the fuel pump, and its wiring, needs to be checked; the problem is likely due to a faulty pump, or a short in the wiring,...

Q: fuel pump area noise. 2006 VW Passat 3.6L

Hello, and thank you for writing in. The ESP light seems to be out of place, and we need to make sure you do not have several issues going on at once. Typically it lights up when the system is...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...