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・Save up to 30%

Get a quote

What others are asking

Q: Car not on, wipers/horn sounded, smoke and fire started

Hello. Wow, that's sounds like a scary situation. If anything aftermarket has been added to this vehicle, then that may be the problem. Many people do not know the right way to add electronics to this kind of car. If...

Q: weird noise with cold air intake and idle

This is a common symptom of the mass air flow sensor needing to be upgraded due to the increased air intake. The mass air flow sensor operates based upon predetermined stock tuning in the ECM. When the air flow changes,...

Q: Car stalls when starting

Hello, I am assuming that you have a reoccurring code for a crankshaft sensor. The connector for the sensor should be checked for corrosion and pin tightness. The wiring should be checked between the crankshaft sensor connector and the engine...

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 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...
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...