1. Fuel Filter*: A clogged or dirty fuel filter can restrict fuel flow, leading to stalling after the vehicle warms up.
2. Fuel Pressure Regulator**: Regulates the pressure in the fuel line. A faulty regulator may cause the engine to stall when warm due to insufficient fuel pressure.
3. Ignition Issues**:
- Spark Plugs: Worn or faulty spark plugs can lead to misfires and stalling after warm-up.
- Spark Plug Wires: Damaged or worn-out spark plug wires can cause faulty spark delivery.
- Ignition Coil: Responsible for generating a high voltage for the spark plugs. A faulty coil may lead to weak or no spark.
- Distributor Cap and Rotor (if equipped): Worn or cracked components can disrupt ignition timing.
4. Thermostat**: Regulates the engine's operating temperature. A faulty thermostat might result in overheating, causing fuel vaporization in the engine and subsequent stalling.
5. Idle Air Control Valve (IAC)**: Controls the amount of air entering the engine. A faulty IAC can result in insufficient airflow, causing stalling.
6. Faulty Oxygen Sensor**: Monitors the air-fuel ratio in the engine's exhaust. A faulty sensor can affect the fuel mixture, leading to stalling.
7. Weak Fuel Pump**: Even though the fuel pump is new, it might be underperforming or struggling to provide enough fuel once the fuel system heats up due to wear or internal issues.
8. Engine Coolant Temperature Sensor (ECT)**: Sends signals to the Engine Control Unit (ECU) about the engine coolant temperature. A malfunctioning ECT can cause improper fuel mixture and affect the engine's ability to maintain combustion.
9. Vacuum Leaks**: Air leaks in the engine's vacuum system can disturb proper engine operation and contribute to stalling.
10. Computer-Related Problems**:
- ECU/PCM: Responsible for managing various engine systems. Faults in the ECU can lead to stalling issues after the engine warms up.
- Sensor Inputs: Faulty input signals from various sensors (e.g., throttle position sensor, crankshaft position sensor) can cause unexpected stalling.
11. Catalytic Converter**: A clogged catalytic converter can restrict exhaust flow, leading to engine stress and stalling.
12. Air Filter**: Check your air filter to make sure it is clean and not clogged, as a clogged filter can restrict airflow to the engine.
