- The IAC valve regulates the air that bypasses the throttle plate, ensuring a smooth idle.
- A faulty IAC valve can lead to a sudden drop in engine RPM, causing a stall.
2. Faulty Throttle Position Sensor (TPS):
- The TPS communicates the throttle's position to the Engine Control Unit (ECU).
- A faulty TPS can send incorrect signals, leading to an unstable idle or stalling.
3. Vacuum Leaks:
- Leaks in the vacuum system can disrupt air-fuel mixture ratios and cause a stall.
- Check for leaks in hoses, gaskets, or other components.
4. Fuel System Issues:
- Clogged fuel injectors, a failing fuel pump, or low fuel pressure can cause the engine to starve for fuel, leading to a stall.
5. Faulty Oxygen (O2) Sensor:
- The O2 sensor monitors exhaust gases to help the ECU adjust the fuel mixture.
- A faulty O2 sensor can provide incorrect feedback, causing the engine to stall.
6. Electrical Issues:
- A weak battery, faulty alternator, or loose electrical connections can disrupt engine performance and lead to stalling.
7. Transmission Issues:
- Worn transmission components, fluid leaks, or transmission control module problems can also cause a car to stall.
8. Clogged Catalytic Converter:
- A severely clogged catalytic converter can impede exhaust flow, causing a stall.
9. Computer (ECU) Problems:
- Malfunctions within the ECU, such as software glitches or hardware failures, can cause unexpected engine shutoffs.
If your car is experiencing stalling issues, it's essential to have it inspected by a qualified mechanic to diagnose and rectify the exact problem.
