1. Fuel System Issues:
- Fuel Pump: Check the fuel pump for proper operation. A failing fuel pump may cause intermittent fuel delivery, leading to stalling.
- Fuel Filter: A clogged fuel filter can restrict fuel flow and cause the engine to stall.
- Fuel Pressure Regulator: A faulty fuel pressure regulator can cause incorrect fuel pressure, leading to stalling.
2. Ignition System Issues:
- Spark Plugs: Worn or fouled spark plugs can cause misfires and stalling.
- Spark Plug Wires: Damaged or loose spark plug wires can disrupt proper ignition, causing stalling.
- Distributor Cap and Rotor: A faulty distributor cap or rotor (if applicable) can cause ignition problems and stalling.
3. Air Intake System Issues:
- Air Filter: A clogged air filter can restrict airflow to the engine, leading to stalling.
- Idle Air Control Valve: A malfunctioning idle air control valve can cause unstable idling and stalling.
- Throttle Position Sensor: A faulty throttle position sensor can provide incorrect signals to the engine control unit, causing stalling.
4. Engine Control System Issues:
- Oxygen Sensor: A faulty oxygen sensor can provide incorrect feedback to the engine control unit, affecting fuel mixture and causing stalling.
- Manifold Absolute Pressure (MAP) Sensor: A faulty MAP sensor can provide incorrect manifold pressure readings, leading to stalling.
- Engine Control Module (ECM): A malfunctioning ECM may be unable to properly process sensor signals and control fuel injection and ignition, resulting in stalling.
Note:
- The absence of error codes doesn't necessarily mean there are no issues. Some problems may not trigger the "Check Engine" light or generate error codes.
- A thorough inspection and diagnosis by a qualified mechanic is recommended to identify the exact cause of the stalling issue.
