What are the reasons for a vehicle stalling after starting?
2 Answers
Reasons for a vehicle stalling after starting: 1. Triggering the vehicle's anti-theft system: When the anti-theft system is activated, the engine automatically locks. Even if it can start, it cannot run, and the anti-theft light will illuminate. This is often caused by the owner using a non-chip key that the system cannot recognize. 2. Ignition switch failure: Poor contact of internal contacts in the ignition switch can cause the dashboard battery light, oil light, and engine fault light to not illuminate. 3. Low fuel system pressure: When the fuel system pressure is too low, the normal injection time delivers too little gasoline, resulting in a mixture that cannot be compressed and ignited. However, during startup, the extended injection time corrected by the startup program allows the gasoline to be compressed and ignited despite the low pressure. Once the vehicle starts and returns to normal injection, it stalls.
I've encountered several instances of stalling immediately after starting the car during my over ten years of driving. The most common issue is fuel delivery problems, such as a faulty fuel pump or a clogged filter. Once, it was due to aging ignition coils causing cylinder misfires, making the engine shake twice before stopping. Some older cars may stall because of carbon buildup in the throttle body restricting air intake, which can be resolved by cleaning. Sensor malfunctions are also common; a failed crankshaft position sensor can prevent the engine from starting altogether. Poor electrical connections are particularly frustrating—I once had a loose connection in the ignition switch wiring, causing the car to stall seconds after starting. For newer cars with start-stop functionality, low battery voltage can force the engine to shut off, and replacing the battery solves this issue. If the cause remains unclear, using a diagnostic tool to read fault codes is necessary.
