My car stalls at slow speeds (bumper to bumper).

My car stalls at slow speeds (bumper to bumper). I have taken it in to be looked at and they are unable to replicate this issue.

My car has 165000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello there, a few faults could cause the vehicle to stall at low speeds. The most common faults would be with the cooling fan, MAF sensor, power brake booster, vacuum leak, fuel pump, or ignition coil. I’d suggest getting help from a qualified technician, such as one from YourMechanic, who will be able to diagnose your stalling issue and perform any repairs required.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

There are three major causes for a stalled engine: A lack of fuel, a lack of air flow and improper ignition. Running out of fuel is one of the most common causes of engine stalling, but dirty fuel injectors or a plugged fuel filter can also be the culprit. Your engine needs air to run properly as well.
Common reasons for this to happen:

Low fuel pressure, dirty or defective fuel injectors, or broken fuel pump: The fuel pump is responsible for transferring fuel from the tank to the engine.

Some of the most common sensors that lead to engine stalling include the mass airflow sensor (MAF), engine coolant temperature sensor (ECT) and manifold absolute pressure sesnsor (MAP). The idle air control valve (IAC) and exhaust gas recirculation valve (EGR) are also well known for causing engine stalling.
This sensor controls ignition timing of the engine and when it fails the computer does not know when to ignite the cylinder causing the engine to stall and not start correctly. I would recommend having a technician from YourMechanic come out and replace the sensor.
If the engine stalls while idling or driving, the engine may be running out of fuel or not receiving enough fuel pressure to keep it running. The most likely cause of this kind of stalling would be a fuel pump that is not spinning fast enough or is intermittently cutting out.
The most common reasons a Hyundai Elantra engine stalling are the fuel system, the air intake system, or the ignition system. Search our network of RepairPal Certified shops near you to speak with a technician about your issue.
The Idle Stop and Go (ISG) system automatically and temporarily shuts down the engine when vehicle is stopped and idling to improve fuel efficiency and reduce exhaust gas emissions.
The ABS system will not cause the engine to die. You will need to have the engine scanned for any trouble codes to see the reason you are having the engine stall.
Will a bad O2 sensor cause rough idle and loss of engine power? You bet. Moreover, you may also notice poor acceleration, engine misfires, and even stalling. Bad oxygen sensors disrupt all kinds of essential engine functions, including engine timing, combustion intervals, and air-fuel ratio.
The most common sensor which can lead to your car stalling is the manifold absolute pressure sensor (MAP) or the mass air flow sensor (MAF).
The signal from the coolant temperature sensor tells the engine`s computer when to apply extra gasoline during a cold start. A faulty sensor can confuse the computer, keeping it from providing enough fuel. As a result, the engine may hesitate or stall.
Bad solenoid may be causing vehicle to stall.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My car stalls at slow speeds (bumper to bumper).
ANSWER : Hello there, a few faults could cause the vehicle to stall at low speeds. The most common faults would be with the cooling fan, MAF sensor, power brake booster, vacuum leak, fuel pump, or ignition coil. I’d suggest getting help from a qualified technician, such as one from YourMechanic, who will be able to diagnose your stalling issue and perform any repairs required.

Could this cause ur car to stall in warmer weather? My car never stalls during winter months. But from spring on its a neverendin
ANSWER : You should have the check engine light and engine scanned to see if the engine may be running lean due to low fuel pressures or clogged injectors. You should also have the mass airflow sensor cleaned and checked for proper readings and replace if not within specifications. The vehicle runs richer in colder weather and may be the reason for not stalling. You should clean injectors, clean throttle body and idle control valve then clean mass air sensor and relearn idle.

Car hesitates and slows down badly at times. It almost stalls at times. It keeps slow speed at 20-30KM.
ANSWER : Hello. I would need to know the year of the vehicle to know where the fuel filter is located. If this is an older model, it is located under the vehicle. Most of the newer models only have a filter on the fuel pump.

From what you are explaining, it sounds like the fuel pump is failing. When the fuel is low, the pump will get hot and a weak pump will lose pressure causing this to occur. I would usually check the fuel pressure to see if it is low, especially when the fuel level is low. If it is, then the pump needs to be replaced. If you plan on having this done, consider YourMechanic, as a certified technician can come to your home or office to diagnose the hesitation problem and guide you with repairs.

Problem with speed. No check engine light on but when accelerating speed, it decreases then speeds right back up. No stalling at all
ANSWER : Hi, thanks for writing in. This is a common problem associated with fuel/air delivery which is very commonly related to what is called a mass airflow sensor. This monitors the flow of air intake into the throttle body as it is mixed with fuel to deliver the right air/fuel mixture into the motor. When this is not working properly, this will cause this kind of hesitation or surging when trying to accelerate. I would recommend having an expert from YourMechanic come to your home or office to confirm a diagnosis on the issue and make or suggest the necessary repairs or replacements.

Eps light came on and car started to slow down, stepped on gas and car was still slowing down. Had to shut it off then turn it on
ANSWER : Hi there. In most cases when the EPS light comes on, it indicates an electrical fault with the electronic power steering system. As a safety device, most of the time, Hyundai and other manufacturers will activate a fail safe or "limp mode" that restricts the throttle to ensure you have an opportunity to drive safely to a mechanic to have this issue inspection. I would recommend having a professional mobile mechanic come to your location to complete a service light inspection, so they can determine what’s going on with your Hyundai.

My car is slow to start
ANSWER : Hi there. Typically what you are describing is an indication that a tune up service is due. As the vehicle’s ignition and fuel system components age, they will collect excessive levels of carbon deposits, which makes it more difficult to ignite the fuel / air mixture in the cylinder. This is why it takes a few seconds of cranking to actually fire up. A traditional tune up includes replacing the spark plugs, plug wires, distributor cap, rotor and coil packs. It also includes cleaning the fuel injectors, the throttle body, and possibly replacing mass air flow sensor. However, there could be other components that are damaged that are causing this issue; so before you replace any parts, I would recommend having one of our professional mobile mechanics come to your location and complete a car is hard to start inspection; so they can pinpoint the source of your issues and ensure the right repairs are made.

Car is chugging at low speeds and then stalls when I stop.
ANSWER : This may be related to a dirty or failing idle air control valve. The idle air control valve reads 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 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 repair your idle air control valve.

The engine stalls when I put the car in reverse, but if I go past reverse into drive there is not an issue.
ANSWER : Hi there. Usually when you shift into reverse and engage the brake it will cause the engine RPM to drop; as it’s creating a load against the transmission and the engine. If the engine stalls, it may be caused by a faulty idle control valve, bad O2 sensors, or clogged fuel injectors.

In regards to the "pan", we’re not sure what you are referring, so it may be a good idea to contact one of our local professional mechanics to complete a battery inspection to determine what’s going on with your 2010 Ford Focus.