Skip the auto shop - Our mechanics make house calls

Q: Car stalling

asked by on

Hi My car will sometimes stall when shifting from reverse to drive. Sometimes needs longer than normal cranking time to start. The ideal rpm seem to fluxuate when the engine gets warm. The spark plugs and wires are new and the mass air flow sensor has been cleaned. A code reader shows no unusual codes. Please help.

My car has 62000 miles.
My car has an automatic transmission.

A: You may have a dirty or failing idle air co...

You may have 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. Since this valve is controlled by the vehicle’s computer, it 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 with the help of the idle air control valve. When the engine RPM drops below the normal range of about ~800 RPM, this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your idle air control valve.

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: Popping noise when turnning the wheel, and want reverse straight, or stop reversing

This is a common sign of a failing CV joint. A CV (Constant Velocity) joint is a shaft that connects the transmission to the wheels, essentially transferring the power from the drive train directly to the wheels. The CV joint...

Q: Car vibrating while in drive or idling

Hi, it sounds like your motor mounts have worn out or are beginning to wear out. Motor mounts connect the engine to the frame of the body and help absorb the vibrations that the engine create, to make the ride...

Q: Where is the Heating A.C. door actuators2 Lesabre Custom with manual control.

It is attached to the HVAC assembly behind the glove box. Sometimes you can remove the glove box and access it and other times you will need to remove a good portion of the dash. This is determined on a...

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...
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...
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...