Skip the auto shop - Our mechanics make house calls

Q: Car won't stay running unless MAF is unplugged.

asked by on

My car has 190000 miles.
My car has an automatic transmission.

A: Short of a vacuum leak, this seems to indic...

Short of a vacuum leak, this seems to indicate to a dirty or failing idle air control valve. As you know, 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 which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature, and electrical system load or voltage. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed.

This is all controlled by the idle air control valve. When the engine RPM drops below the normal range of 750-800 RPM (for most cars), this may indicate a dirty or faulty idle air control valve. In your case, your vehicle stalls instead of slowing to an idle the RPM’s increase which indicates this valve is not working properly. To avoid any unnecessary repairs, I would recommend having an expert from YourMechanic come to your location to diagnose you stalling issue firsthand and repair your idle air control valve as necessary.

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: My car randomly shuts off - 2007 Nissan Sentra

Hello. You'll need to start by having the battery load-tested and charging system checked. You may need to clean the battery terminals of any corrosion since this may explain the intermittent no crank with just clicking. Your starter may also...

Q: Window not going up

The window regulator or motor is the most likely cause of the window not going down. If you hear the motor running, but the window does not move, then the regulator is broken. If you do not hear the motor,...

Q: Battery plate

Hi there: It depends on where the hold-down strap is located that is rusted. If there are two individual bolts on either side of the battery, you can cut the one closest to you that is easier to access and...

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...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...