Q: Hissing sound

asked by on

Previous Question(Answered):

Q: Hissing sound asked by Jimmy F on August 23, 2016

Hello, on my two cars Hyundai i10 2010 and BMW x3 2006 I can hear a hissing sound when I open the throttle On the Hyundai it can be heard on low RPMs and it sounds like a vanos valve(which I doubt that car has) but on the X3 it is much higher and can be heard at high RPMs (Full throttle).

Follow Up Info: No check engine light on yet at full throttle a burn odor can be smelled. Are these two things correlated?

My car has an automatic transmission.

Hello.

Hissing noises when the throttle is opened can be considered normal. If the hissing noise is excessively loud, or can be heard when the throttle is closed then that may be a sign of another issue, perhaps a vacuum leak. A burning smell can be caused by a few things, commonly by oil or power steering fluid leaks that make contact with the exhaust manifolds. I would recommend having the vehicle inspected by a certified mechanic, like one from YourMechanic, for any leaks, and checked for the hissing sound, to see if it is normal or perhaps related to the issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Hissing sound

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: Oil leaking and engine went out after sitting for 5 months.

If oil dumped out of the vehicle and then it stopped running, there was likely a catastrophic failure and subsequent lack of oil pressure. From your description, it sounds like there is a good chance the engine is ruined. A...

Q: Oil pan removal / replacement

The oil pan in your E300 is a two part oil pan and you are looking at the lower pan part. If this is the part that is damaged then you can get it out by disconnecting the motor mounts...

Q: Check engine light is on with codes P2063 and P2064

Hello. The codes you are getting are for the exhaust fluid injection system. Most of the time, this is the result of a failure in the fluid sensor. In some cases, the tank and sensor can be cleaned but most...

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 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...
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...