Air Filter noise and Check Engine Light 2004 v6-4.2l ford...

Q: Air Filter noise and Check Engine Light

asked by on February 05, 2018

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

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

What is normal idle for a 2005 Ford focus?

Hi There, Generally, the warm up high idle will last for less than a minute or so depending on the outside ambient temperature, however once the temperature sensor reaches the normal operating temperature (usually between 190-200 degrees F). This will...

Transmission hose popped off and car wouldn't go. I've had it repaired it drove for a second and now it only goes in reverse

When you lost all the fluid it may have damaged the transmission. You should have the fluid level rechecked first and if low then top it off and recheck it. If still only get reverse then you will need to...

Starts and dies

It sounds like what you are describing is something related to a fuel supply issue, which may be related to low fuel pressure, faulty or dirty fuel injectors, a faulty or dirty idle air control valve (this relays information about...

Related articles

The Best Used Cars to Buy If You're a Personal Trainer
As As a personal trainer, you either operate out of a gym, or you go to your clients. Either way, you probably don’t have to haul any more gear than what fits into your gym bag, so your main focus...
2012 Ford Fusion vs. 2012 Toyota Camry: Which Should I Buy?
While most people believe that domestic sedans just cannot compete with the Honda Accord and the Toyota Camry, the industry leaders, that is not necessarily true. Yes, there are some metrics where the Camry just excels, however the Ford Fusion...
How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It is a five-button numeric keypad that is used to: Eliminate...