Q: My car won't stay on unless I keep my foot on the gas

asked by on

My car won't stay on unless I keep my foot on the gas and just started it randomly. And drives normal but once I take my foot off the gas it dies slowly
My car has an automatic transmission.

Hi There, It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate. The idle air control valve is a small valve on the engine’s intake system that reads the air intake as it comes into the motor. This is controlled by the car’s ECM which uses this information to make adjustments to the air/fuel ratio depending on various inputs such as outside air temperature, intake air temperature, load and various other things. As you accelerate, your car’s engine is receiving a much higher dose of fuel than when at idle and conversely, when you let off the gas pedal, there is a sudden change in this fuel supply as a result of your foot letting off the pedal. When this happens, the job of the idle air control valve is to bring this deceleration down to a slow and smooth idle rather than suddenly cutting off the fuel supply causing the motor to die. When the idle air control valve is not working properly, this cause a disruption in this process resulting in the engine not being able to idle properly. I would recommend having a professional come to your location to diagnose and inspect your vehicle.

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 won't stay on unless I keep my foot on the gas

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: Car jerks while driving and warning lights are on - 2001 Ford Focus

The major causes of sputtering or jerking while driving are caused by fuel, spark, or electrical issues. Due to the number of emergency warning lights that flash, it is likely a power supply issue. This can be caused by a...

Q: Oil leak above driver side exhuast manifold

The most common oil leak on these engines is the valve cover gaskets. The gaskets are a mix of rubber and metal or plastic and the rubber will get hard and will not seal very well when the engine is...

Q: Water pump gasket leaking

Removing the water pump on your vehicle is a 6 hour job and consequently involves pages of procedures, torque specifications, and a lot of detail. Due to the amount of time involved, it is not worth it re-installing the old...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.