Q: Car whistling, rough idle.

asked by on

Whistling sound coming from underneath hood. Engine runs rough during idle.

This sounds exactly like the symptoms of a vacuum leak. When the engine inhales air through an opening it is not supposed to is a vacuum leak. The whistling sound is due to the air being drawn in through a small hole. The rough idle is due to the fact that the engine is receiving more air than fuel. I would recommend having a technician, such as one from YourMechanic, inspect your engine for vacuum leaks. Most likely it will be a hose with a crack near the air cleaner, or intake manifold.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car whistling, rough idle.

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 heater is blowing cold air when idling - 2005 Nissan Altima

Hello. A cold blowing heater can absolutely be caused by low coolant. You are on the right track. However, if that coolant is not being circulated through the heater core, the warm coolant will not cycle into the core, and...

Q: AC melting vents.

An overall test of your air conditioning system would be helpful it sounds like the either the compressor isn't cycling refrigerant for some reason probably a leak in the system somewhere, a certified mechanic would be able to find the...

Q: Q: Engine idle fluctuates

This may be a result of a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Related articles

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.