Skip the auto shop - Our mechanics make house calls

Q: Loud pitchy noise

asked by on

For the past year my BMW X3 suv deals with this loud pitchy noise that comes up at times when I'm driving. The strange part about it is that no light shows up on the dashboard indicating where problem is coming from but as soon I turn the car off and I can literally hear the noise slowly diminish and go away(almost like air coming out) . When I start it back up the noise is gone.

My car has 15800 miles.
My car has an automatic transmission.

The BMW X3 and X5 SUVs have an air suspension option, which utilizes an air compressor (under the spare tire), and compressed air shocks in the rear suspension. Your symptoms suggest a leak in this system: the air shocks themselves, air lines, check valves, etc. Your would hear this "air escaping" noise after shutting off the engine. Engine and other noises probably cover up this noise while driving. I would recommend having a car is making a noise inspection completed by a mobile, professional mechanic, such as one from YourMechanic, to confirm this diagnosis, get an accurate assessment of damage and cost estimate for repairs.

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: My car won't accelerate over 40 mph and check engine light is on

Hi there. In many cases, when you have an issue with the car accelerating and the check engine light comes on, it's caused by a mechanical problem with either a drive-system, fuel or ignition system component. The light is triggered...

Q: Transmission fluid leak

If transmission fluid is leaking, I would recommend having the vehicle looked at by a professional technician, such as one from YourMechanic. Often times, the vehicle's transmission pan gasket has sprung a leak, and this is a minor repair for...

Q: Gear performance

Your transmission is stuck in one gear, most likely the second gear. It could be shifting into third, but I can't say for sure. This can occur for two reasons. Either the transmission is failing or your car has gone...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.