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?

A: This generation of Toyota Previas has a kno...

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・Save up to 30%

Get a quote

What others are asking

Q: loud humming noise front in passenger side

It sounds like your humming noise is likely a bad wheel bearing or tire. I would lean more towards a bad wheel bearing. A visual inspection can easily determine where the noise is coming from in this case. Keep in...

Q: Gear shift stuck in park

There are a few possible malfunctions that can cause the shifter to be stuck in the park position. It is possible that there is a problem with the transmission, but more often, there is a problem with the shifter cable,...

Q: Power window stuck

Hi there. The most common cause of the window glass coming off is a broken window regulator. If the regulator assembly fails, the track can become crooked and it can knock the window off track. In order to diagnose exactly...

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 to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...