* Crankshaft Position Sensor (CKP Sensor): This sensor tells the computer the engine's rotational speed. A faulty CKP sensor can cause the engine to stall, especially when idling or after a sudden decrease in speed like when stopping. This is a very common cause of this problem.
* Cam Position Sensor (CMP Sensor): Similar to the CKP sensor, a faulty CMP sensor can disrupt the engine's timing, leading to stalling.
* Throttle Position Sensor (TPS): This sensor tells the computer the throttle's position. A faulty TPS can cause erratic idle and stalling.
* Idle Air Control Valve (IACV): This valve controls the air entering the engine at idle. If it's dirty or faulty, the engine might stall when idling after a stop.
* Mass Air Flow Sensor (MAF Sensor): This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor can cause poor fuel mixture, leading to stalling.
* Ignition System Problems: Worn spark plugs, ignition wires, or a failing ignition coil can cause misfires, leading to stalling.
* Fuel Delivery Problems: A clogged fuel filter, weak fuel pump, or problems with the fuel injectors can starve the engine of fuel, causing it to stall.
* Alternator: While less likely to cause immediate stalling, a failing alternator might not charge the battery sufficiently. If the battery is low, the engine could stall when the electrical demands increase after stopping (like when turning on the headlights or radio).
* Battery: A weak or failing battery can also cause stalling, especially after a stop.
Troubleshooting Steps (Proceed with caution and seek professional help if unsure):
1. Check the battery terminals and connections: Make sure they are clean, tight, and corrosion-free.
2. Check the engine's idle speed: Is it too low or erratic before it stalls?
3. Listen for unusual sounds: Any clicking, grinding, or unusual noises from the engine compartment?
4. Check engine codes: Use an OBD-II scanner to retrieve any diagnostic trouble codes (DTCs) stored in the computer. These codes can point towards the specific problem.
Important Note: Diagnosing this issue accurately often requires specialized tools and knowledge. If you're not comfortable working on your vehicle's electrical system or engine, it's best to take it to a qualified mechanic for diagnosis and repair. Ignoring the problem could lead to further damage.
