Skip the auto shop - Our mechanics make house calls

Q: Acceleration high-pitched whistling

asked by on

Lately, when I'm driving at higher speeds, like 65 mph and over, I can hear a high-pitched whistling. It also happens when I floor the gas. What could be making this noise?

This generation of Toyota Previas has a known issue with this that is typically related to something called a "flex pipe" which is a part of the exhaust system that sits in front of the catalytic converter. The fact that it fluctuates as you accelerate makes sense since the higher the engine RPM’s, the more exhaust flow runs through this flex pipe. To verify this as the issue, a professional from YourMechanic can inspect the sound in person in order to determine what should be done.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Head gasket

Hi There, Replacing a head gasket can be a very tedious job that requires the gasket to be sealed perfectly in order to create the necessary compression for the motor to fire when starting. I would suggest checking each of...

Q: Recently replaced fuel pump fuel pump still would not start until I jumped out relay fuel pump started after that I can hear it ho

Hi there. If you replace a fuel pump, hear it running but are not getting fuel to the engine, there could be several possible sources. The fuel pump is the first component in the fuel system that will pick up...

Q: Can/should passenger side airbags ever deploy without having driver airbags deploy?

I believe that if the passenger air bag deploys the driver side air bag should also deploy. If the air bag that deployed was a passenger 'side' air bag (meaning an airbag located in the seat as opposed to the...

Related articles

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...
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...