Skip the auto shop - Our mechanics make house calls

Q: Rough idle on car

asked by on

My car is idling roughly.

A: Hello. The most common cause of a rough idl...

Hello. The most common cause of a rough idle on this engine is a vacuum leak. Most of the time this is caused by a loose or broken vacuum hose. With the engine running you can listen for any hissing noises from the hoses to see if one is leaking. If nothing is found then it may be due to worn spark plugs. Most of the time if the problem is not obvious a mechanic will scan the computer for codes to see if there is anything saved in the computer. If there are then that may identify where to start. If not then the computer data from the sensors would be looked at to see if it is a sensor problem as a failing is a dirty sensor can also cause this. I would typically also check to see if the throttle body is dirty. If it is then it should be cleaned first to see if it solves the problem. Have a certified mechanic diagnose your car’s rough idle to have this problem solved accordingly.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Why Does an Engine Idle Fast or Slow?

Several factors can cause a fast or slow engine idle. Running the air conditioning or defroster will speed up the idle speed of the engine. Components that impact the engine idle speed include the idle air control motor valve, air...

Q: Overdrive and reverse is out. There is also a grinding noise and trouble codes P1289 and P0340.

Hello and thank you for contacting YourMechanic. The code P1289 is for the cylinder head temperature sensor input being high. Check the harness to the cylinder head temperature sensor and check to see if there is any corrosion or any...

Q: Rear wheel drum making noise

Usually in this scenario, the wheel drum should be remove and the brakes will need to be cleaned. The vehicle should be jacked up and placed on jack stands. The wheel drum should then be removed. Ensure that the emergency...

Related articles

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...
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...
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.