Skip the auto shop - Our mechanics make house calls

Q: Car idling and running rough

asked by on

At first my car would drop below the normal number of RPMs when you came to a stop before going back to normal. Now, the Check Engine light is on, and the car idles and runs extremely rough.

Hello, the engine is equipped with an electronic valve called an idle air control valve. The idle air control valve lets a metered amount of air into the engine at idle to have a comfortable idle and ensure the engine won’t stall. Since the Check Engine Light is on, the vehicle should be scanned for codes and data. The chances are high that the code is related to the low idle speed, which is related to the idle air control valve. If you would like to have this checked, a certified mechanic, such as one from YourMechanic, can come to your home or office to diagnose your car’s rough idling issue.

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: my gas mileage is decreased and i have random misfires, noisy lifters when cold but noise goes away once fully warm . o2 sensor?

Hi there. Thanks for writing in to YourMechanic.com about your issues the Toyota is experiencing. It is possible that you have two, independent problems that are causing two unique symptoms; the random misfire and the fuel economy issue. Although faulty...

Q: Flashing check engine light, service stabilitrak, traction control light, only while idling

Hello. If you are getting a code on cylinder 4, then that means there is an issue with that cylinder. Most of the time, with so few miles, the issue is not related to dirty fuel injectors but is caused...

Q: My Check Engine Light came on - 2011 Hyundai Accent

When the Check Engine Light comes on, it means the engine controller has detected a fault in one of the sensor inputs and that the fault is bad enough to affect the emissions. Most cars have additional warning lights for...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...