Skip the auto shop - Our mechanics make house calls

Q: Idle problem

asked by on

When start engine for about 3 minutes it shuts off. When going down a hill or stepping on brakes it shuts off.

My car has 1819907 miles.
My car has an automatic transmission.

A: You may have a dirty or failing idle air co...

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. 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・Save up to 30%

Get a quote

What others are asking

Q: Car shakes and when I accerlerate, it shakes even more

Hi, thanks for writing in. This can be caused by many different things such as faulty or plugged injectors, low fuel pressure or a faulty O2 sensor. If you would like help, consider having an expert automotive technician from YourMechanic...

Q: 06 dts 110k new plugs and packs started idle shuttle hesitant at first then stops bought car used i believe fuel filter is origina

Hello, thanks for writing in about your Cadillac DTS. The fuel filter and fuel pump may be the cause of this issue. You should have the fuel pressure tested first to see if the fuel pump is failing. Replace the...

Q: Truck is hard starting and when it does start it shut off when you put it in gear

You need to have the fuel pressure checked to see if the fuel pressure regulator is leaking fuel into the intake which is flooding the engine out. If the fuel regulator is proven to be bad then replace it. Afterwards,...

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...
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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...