Skip the auto shop - Our mechanics make house calls

Q: Car shuts off on idle

asked by on

Hi,

I've invested quite a bit in replacing parts on this vehicle and out of the handful of problems I'm left with one that has been there for about 3 months. Normally at idle, or below 1.2k RPM the car will shut off. About 1 out of every 80 idles, but it's starting to happen multiple times per day now. Sometimes it will start on its own immediately after but sometimes it requires a jump. After a jump the car feels revitalized with handling and driving; it's odd. I've tested the battery voltages and with AC on full, lights on, accessories on and engine fans on the battery is still testing at 13.04V - 14.75V so I believe the alternator is working. At rest, ignition off, the battery is constantly between 12.6V-12.8V. I'm not getting an engine code from the computer. I've checked the drive belts and replaced them all are functioning properly now. I'm left with fuel delivery or idle engine processes... Help! :-) Please and thank you.

My car has 164000 miles.
My car has an automatic transmission.

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. As 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. 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. 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

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: Engine idles rough sometimes and looses power.

Hi there. Most of the time on diesel engines for Ford trucks, there could be an issue with the injection control pressure sensor (ICP). Check the ICP to see if it is functioning and has power to it. The ICP...

Q: My Kia Forte is making a grinding knocking noise when I put it in drive and accelerate and at about 5 mph and up it goes away unti

Hello. Exhaust systems can make a variety of sounds that we would not intuitively expect. When I was first learning about exhaust systems I was surprised to find out how dynamic they can be. I am assuming you are speaking...

Q: How much dose it cost to have the fuel filter replaced on my 2009 town and country mini van?

Billing question sent to CS for the cost of replacing the fuel filter on a 2009, Chrysler, 300 - town and country mini van.

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...
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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...