Skip the auto shop - Our mechanics make house calls

Q: My car engine shuts off while stopped or slowed down

asked by on

My cars engine shuts down whenever I slow down or stop my car. It's not frequently but it has happened a few times. There are no indicators that anything is wrong(no check engine sign). How can I find out what the problem is if there are no indicators?
My car has an automatic transmission.

This is a common sign of a failing 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. 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 monitored by the idle air control valve. Your car seems to 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. 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

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!

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: If the air is too cold, motor knocks on startup

As strange as it may sound, the oil filter that was used during one of your oil changes may be the root cause. GMC Technical Service Bulletin (TSB) 10-06-01-003C has detailed technical information showing that some non ACDelco oil filters...

Q: Driving lights not working

You may have a pair of blown out headlights. I have seen this a lot with Hyundais for some reason. There is a possibility that there may be another electrical problem as well. I would ask for help from one...

Q: Just got a tune up but car keep shutting off

I'm assuming your wondering if the tune-up has contributed to your car shutting off. It is possible. I would take it back to the mechanic and let him know. But let's be clear that this may be merely coincidental. So...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.