Skip the auto shop - Our mechanics make house calls

Q: My car turns off when at idle or in a traffic light

asked by on

I have change the throttle body gasket cover and still the same thing

A: This is a common sign of a dirty or failing...

This is a common sign 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 at idle. his valve is controlled by the vehicle’s computer which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage.

When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed. This is all controlled by the idle air control valve. When the engine RPM drops below the normal range of 750-800 RPM (for most cars), this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. To avoid any unnecessary repairs, I would recommend having an expert from YourMechanic come to your location to diagnose your stalling condition and repair your idle air control valve as necessary.

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: jeep won't get out of park and dash instruments not working.

Hello, thank you for writing in. The vehicle is likely going to be having electrical issues pertaining to a fuse, relay, or fusible link. When multiple systems are experiencing issues, there is typically something they have in common that has...

Q: Lack of power and idling in 1999 Mitsubishi Eclipse 2.0.

Those cars have a limited life span. First thing you want to do on the one that's has 205,000 miles is to get a mechanic and do a wet and dry compression test of the engine. That will tell you...

Q: Stalling upon startup when cold, error code P0102

The P0102 code indicates a fault with the mass airflow sensor system. The mass air flow or MAF is a sensor that is used to monitor the air coming into the engine. Many of these include an intake air temperature...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...