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: Car won't start after starting minutes before, battery not dead

Firstly, remove the back seat's bottom. Then listen near the fuel pump access cover when someone cycles the key on and off. You should hear the fuel pump come on. If not then you may have a burned out fuel...

Q: I have a 2002 chevy avalanche z71 it won't move forward in any gear,but it will move in reverse

Check to see if any diagnostic trouble codes have been stored in both the PCM and TCM. Check the fuses in the circuits that power the transmission controls. Occasionally, a short in a sensor such as an oxygen sensor will...

Q: MOT failures - repair work

Hi there. It's really difficult for us to give you an accurate estimate on repairs without inspecting the vehicle first. The inspection allows us to diagnose what is causing the tail light malfunction and emergency brake issues that your MOT...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...