- A faulty oxygen sensor can provide incorrect air-fuel ratio data to the Engine Control Unit (ECU), causing the engine to run lean (too much air, not enough fuel), which can lead to stalling during acceleration.
2. Clogged Fuel Filter:
- A clogged fuel filter can restrict the flow of fuel to the engine, especially under higher demand conditions like acceleration.
3. Faulty Fuel Pump:
- A failing fuel pump may not be able to supply enough fuel to the engine under increased fuel demand during acceleration, causing the engine to stall.
4. Intake Air Leak:
- An air leak downstream of the air flow sensor will cause the amount of fuel injected to be incorrect as compared to the actual amount of air going into the engine. This discrepancy results in a lean condition leading to hesitation or rough running with poor economy
5. Ignition System Issues:
- Faulty spark plugs, worn-out ignition coils, or damaged spark plug wires can compromise the ignition process, leading to misfires and potential stalling.
6. Faulty Throttle Position Sensor:
- A malfunctioning throttle position sensor can provide incorrect data about the throttle's position to the ECU, affecting the fuel injection and air-fuel mixture, causing occasional stalling.
7. Vacuum Leaks:
- Leaks in vacuum lines can affect overall engine performance, potentially causing rough idling, hesitation, and stalling.
8. Faulty Exhaust Gas Recirculation (EGR) Valve:
- A dysfunctional EGR valve can lead to poor air-fuel mixtures, engine hesitation, and potential stalling upon acceleration when it gets stuck in the open position
It's crucial to have your Mitsubishi Star Wagon diagnosed by a trained mechanic who can accurately identify the source of the stalling issue and rectify it. Self-diagnosis and repair attempts without proper knowledge and equipment can worsen the problem.
