Q: 2003 Mitsubishi Montero Limited Stalls At Stops After Engine Is Warm

asked by on June 30, 2017

When the car is warm and has been driving for a bit (usually after an 25-30 minute journey) the car will stall when it's idling or coming to a stop at stop signs. It's done this 4-5 times in the last few days. I've had the throttle body cleaned but this didn't do the trick.

My car has 105000 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 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

Stall while idle or coming to a stop replaced IAC MAS and TPS due to codes still same issue

Hello, and thank you for writing in. With the codes you are pulling, and the replacements you have already made, you are likely dealing with an issue pertaining to the the throttle itself, or the idle air control valve gasket....

Car idling roughly

It sounds like you are experiencing an engine misfire. In your vehicle this is usually a problem with the ignition system which may require a tune up. This would include replacing the spark plugs and ignition wires. It is also...

Power steering pump is whirring

Usually when the power steering pump makes noise, it is caused by air in the system. It is possible that the inlet hose to the pump has a small leak, causing the pump to pull a small amount of air...

Related articles

Understanding the Mitsubishi Routine Maintenance Required and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. Mitsubishi's Routine Maintenance Required lights indicate when your car needs service.
The Best Used Cars to Buy for Families
If If it’s time for you to search for the top used cars specifically for families, check out the list we’ve put together of the top five. The list of must-haves Typical items that families are looking for in their...
The Best Used Cars to Buy If You Have a Tiny Parking Space
In In many cities parking spaces come at a premium, so you only want to purchase one small space. This small space will end up dictating what vehicle you purchase, so we’ve rounded up some great candidates. Must-haves Arm yourself...