Skip the auto shop - Our mechanics make house calls

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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: Is the drive belt different from the timing belt?

The serpentine belt (aka drive belt), is the belt that drives the accessories on the front of the engine. It drives the alternator, water pump, power steering pump, air conditioning compressor, and any other belt driven accessories. This is the...

Q: Brake light battery light

This may suggest a failing voltage regulator. The voltage regulator is a unit that regulates the charging of the battery by the alternator. When the voltage regulator is not working properly, this may result in the alternator allowing too much...

Q: Pinion bearing making noise

The pinion bearing is a common issue with Ford rear ends. Most of the time, this failure is due to a differential leak that was not addressed and the bearing run dry. I recommend having a trained technician, such as...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...