1. Idle Air Control (IAC) Valve
The IAC valve controls the amount of air that bypasses the throttle body when the engine is idling. If this valve is faulty or dirty, it can cause the engine to stall when it comes to a stop. Cleaning the IAC valve or replacing it if it is faulty should resolve this issue.
2. Throttle Position Sensor (TPS)
The TPS sends a signal to the engine computer (ECU) indicating the position of the throttle valve. If this sensor is faulty, it can send an incorrect signal to the ECU, causing the engine to stall. Cleaning the TPS or replacing it if it is faulty should resolve this issue.
3. Faulty Oxygen Sensor
The oxygen sensor monitors the amount of oxygen in the exhaust gas and sends a signal to the ECU to adjust the air-fuel mixture accordingly. If the oxygen sensor is faulty, it can cause the ECU to provide an incorrect air-fuel mixture, leading to stalling. Replacing the faulty oxygen sensor should resolve this issue.
4. Vacuum Leak
A vacuum leak can cause the engine to run lean (too much air and not enough fuel), which can lead to stalling. Check for any loose or disconnected vacuum hoses and replace them if necessary.
5. Fuel Pressure
If the fuel pressure is too low, the engine will not be able to get enough fuel to keep running and will eventually stall. Check the fuel pressure and replace the fuel pump or fuel pressure regulator if necessary.
6. Ignition System
A faulty ignition component, such as the spark plugs, spark plug wires, distributor cap, or ignition coil, can cause the engine to stall. Check these components and replace them if necessary.
Note: If you are not comfortable performing these repairs yourself, it is best to take your car to a qualified mechanic for diagnosis and repair.
