Q: Vehicle stalls out after idles down when warm.

asked by on

I have replaced the ignition coil, and also just put new wires and spark plugs in it. The vehicle will start-up fine when cold it will run alittle rough. I can drive wherever I need to go. When I shut it off and let it sit for 10 minutes and it will start, but idle down, run rough, and stall. Will have to do that multiple times to finally get it to start and stay running. It only does it when its warm and sits.
My car has 105000 miles. My car has an automatic transmission.

My car has 105000 miles.
My car has an automatic transmission.

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. It may be possible that the enrichment injector is what is keeping the motor running at cold temperatures since this only works when the engine is cold while warming up. Once the engine is warm this no longer works. At this time, the idle air control valve takes over and may cause the motor to stall if dirty or faulty. 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?
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. Vehicle stalls out after idles down when warm.

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: 2004 Ford Ranger doesn't turn off when key is removed

The problem is likely a bad ignition switch. The ignition switch routes power to the entire vehicle including the accessories, computers, fuel and ignition system. Basically, the failed switch is allowing the vehicle to stay on. A professional, such as...

Q: Car not idling properly

Hi, thanks for writing in. I'd be happy to help. This is a common symptom on many cars when what is called a mass airflow sensor is not working properly. This is a unit that monitors air flow intake as...

Q: I'm am having issues with my truck when I get on the freeway. I can't go past 40 mph on the freeway.

Hi there. The EGR (exhaust gas reciculation) Valve needs to removed and cleaned out. If the engine continues to not drive faster than 40 mph, then I recommend replacing the EGR valve. If you need further assistance with your vehicle...

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.