* Dead or weak battery: This is the most frequent culprit. A weak battery may not provide enough power to crank the engine initially, but once running, the alternator can't keep up. The engine dies when the battery is depleted.
* Alternator problems: The alternator charges the battery while the engine is running. A faulty alternator won't charge the battery, leading to the engine stalling once the initial battery charge is used.
* Fuel delivery issues: Problems with the fuel pump, fuel filter, injectors, or fuel lines can prevent sufficient fuel from reaching the engine. It might start briefly before running out of fuel.
* Ignition system problems: A faulty ignition coil, spark plugs, wires, or distributor (in older vehicles) can prevent the spark needed to ignite the air-fuel mixture.
* Crankshaft position sensor (CKP) or camshaft position sensor (CMP) problems: These sensors tell the engine's computer the position of the crankshaft and camshaft. A faulty sensor can cause the engine to stall.
* Mass airflow sensor (MAF) problems: This sensor measures the amount of air entering the engine. A malfunctioning MAF sensor can lead to an incorrect air/fuel mixture, resulting in stalling.
* Throttle position sensor (TPS) problems: This sensor tells the engine's computer the position of the throttle. A faulty TPS can cause the engine to stall or run poorly.
* Vacuum leaks: Leaks in the vacuum system can disrupt the engine's operation and cause it to stall.
* Computer problems (ECU): The Engine Control Unit (ECU) is the car's brain. A faulty ECU can cause a wide range of problems, including stalling.
* Security system issues: In some cases, an immobilizer or other security system might be preventing the engine from running properly.
To diagnose the issue, you'll likely need to:
* Check the battery: Have it tested at an auto parts store.
* Check the alternator: A simple voltage test can determine if it's functioning.
* Inspect fuel system: Look for obvious fuel leaks or damage.
If you can't identify the problem yourself, it's best to take your car to a qualified mechanic for diagnosis and repair. Providing them with details about when the problem started, any warning lights, or other symptoms will help them pinpoint the cause more quickly.
