Q: Car keeps stalling when I press on the brakes

asked by on

I have replaced water pump radiator and thermostat. Because it was overheating. Just to find out there was air in the system. I bled it. Now every time I put the brakes on it will stall. I just don't know what's going on. I'm confused.

My car has 205000 miles.
My car has an automatic transmission.

Your car has a unit in the fuel injection system called an idle air control valve. The idle air control valve monitors 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 (for most cars), this may indicate a dirty or faulty idle air control valve. In cases where this valve is dirty or failing, your vehicle will stall instead of slowing to an idle after the release of the throttle as you have described.

To avoid any unnecessary repairs, I would recommend having an expert from YourMechanic come to your location to diagnose your stalling issue and repair your idle air control valve as necessary.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Car keeps stalling when I press on the brakes

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: Need belt replaced.

You didn't say whether you have the TBI or the 4BL version of this engine, but I'm going to assume it's the latter. This version has belts that are adjustable. A trained professional will be able to adjust the belts...

Q: my car has code p0442 and p0171 2003 suzuki aero. check engine light is on and it stalls occationally when i take my foot off the

Hello, thank you for writing in. The most recent issue with stalling may have triggered additional codes, and the vehicle should be scanned again for a more accurate idea of where to start with diagnostics. From there you can start...

Q: Continuous blowing of 10amp fuse to dash instrument panel and speedometer.

The quick answer is yes, there is a short in the steering column. On some of the columns when you turn sharp you also move the tilt, and if a harness is not protected in the column, the wiring can...

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.