Skip the auto shop - Our mechanics make house calls

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.

A: Hissing noises when the throttle is opene...

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 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: 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: Leaking Hydro oil on drivers side mid car. Can this be a line and if so can just the line be replaced?

It sounds like you may have a blown power steering pressure line or rack and pinion leak. The system will need to be inspected to detect where the leak is coming from before the proper repairs can be diagnosed. You...

Q: No overdrive in my car.

Hi there. Check the 3-4 shift solenoid through the harness to the transmission and see if there is a resistance on it. If there is no resistance on the solenoid, then the solenoid is burned up and needs replaced. Also,...

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 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...
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.