1. Coolant Temperature Sensor (CTS): The CTS is responsible for sending the engine's temperature information to the Engine Control Unit (ECU). A faulty CTS can provide incorrect temperature readings, causing the ECU to miscalculate fuel and air mixtures, resulting in stalling when hot.
2. Idle Air Control (IAC) Valve: The IAC valve regulates the air that bypasses the throttle plate, ensuring proper idle speed. A faulty IAC valve may not adjust airflow appropriately as the engine warms up, leading to stalling.
3. Fuel System Issues: A clogged fuel filter, faulty fuel pump, or a malfunctioning fuel pressure regulator can cause fuel starvation, especially when the engine is hot and demands more fuel.
4. Ignition System Problems: Worn spark plugs, faulty ignition wires, or a malfunctioning distributor cap or rotor can affect spark delivery, resulting in engine stalling when hot.
5. Vacuum Leaks: Vacuum leaks can introduce unmetered air into the intake system, disrupting the air-fuel mixture and causing idling problems.
6. Catalytic Converter: A clogged or restricted catalytic converter can cause backpressure in the exhaust system, affecting the engine's performance and leading to stalling.
7. Faulty Oxygen Sensor: The oxygen sensor monitors the exhaust gas oxygen content and provides feedback to the ECU for fuel adjustment. A faulty oxygen sensor can provide incorrect information, disrupting proper fuel and air mixtures.
8. Throttle Body Issues: A dirty throttle body or a faulty throttle position sensor (TPS) can impact idle stability and cause stalling.
To diagnose the exact cause, it is recommended to have the vehicle scanned for any stored diagnostic trouble codes (DTCs) and have a qualified mechanic inspect the vehicle for any of the mentioned components or systems.
