Q: Air Filter noise and Check Engine Light

asked by on

The air filter sputters during idle. The coolant gauge reads cold for roughly 10 minutes, then balances itself. The "SERVICE ENGINE SOON" lit is lit (supposedly O2 sensor related). The brakes & rotors (front & rear) and left control rod (front) are in need of service.

My car has 124000 miles.
My car has an automatic transmission.

What you are describing sounds like a dirty or 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 at low speeds and at idle. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. This is also an important function when starting the motor as it allows the motor to run and idle on it’s own once the motor fires. 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 making the transition from a higher RPM back down to idle speed while adjusting the air/fuel ratio constantly to allow this to happen smoothly. When the engine RPM drops below the normal range of about 750-800 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 inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Air Filter noise and Check Engine Light

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: When should the airbag system be serviced?

The airbag system in your vehicle does not need routine maintenance. The system was designed to always be operational. To determine when the airbag system in your vehicle needs to be serviced. Looks for indications on the dashboard that...

Q: What is the right way to install the rear main seal?

Hi Justin. Thanks for contacting us today. If you are replacing the rear seal, you really should purchase a service and repair manual for your Ford F-150, as following each step in the right order is crucial to ensure a...

Q: Car engine makes hissing sound when driving and bogs down when idling. 2004 Nissan Maxima

Hi there - you are on the right track. If the hiss comes more directly from the engine (with the hood up for example), you probably have an air leak in the intake tract of the engine. If the hissing...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...