Q: My car idles too low and sometimes shuts off

asked by on

When I begin to pull off, I press the gas and my car hesitates to go, another problem is My idle is too low, when I'm driving and I began to press the brake to come to a stop my car shuts off, I changed my spark plugs, can you please help me I'm not sure if the problems are connected

My car has 169598 miles.

This is a common sign of a 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. This 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 done by the idle air control valve. When the engine RPM drops below the normal range of 750-800 RPM, this may indicate 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?
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. My car idles too low and sometimes shuts off

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: Do I need a whole new ignition or just the ignition switch?

You will need to have the damage to the ignition lock cylinder housing checked to see if just the lock cylinder can be replaced if no damage to housing was done. You will need to have the door and trunk...

Q: My a/c compressor is rattling

There may be a few reasons your compressor can rattle. First the noise will have to be determined to be internal or external to the compressor. If the noise is internal then it is most likely a bad compressor. If...

Q: Car making a low noticeable sound at speeds between 55 km/hr to 70km/hr.

Hi there: Diagnosing 'noises' remotely is one of the more difficult things to do for any mechanic. However, there are a few things which could cause this noise, ranging from loose motor mounts, loose serpentine or drive belt, pulley's or...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...