What Causes an Automatic Transmission Car to Stall While Driving?
2 Answers
Automatic transmission cars may stall while driving due to the following reasons: 1. Blockage in the engine's fuel supply line, leading to abnormal fuel delivery and interruption of the engine's stroke; 2. Severe carbon buildup or erosion in the cylinder's spark plugs, causing unstable sparks and difficulty in engine startup, resulting in abnormal stalling when the throttle changes; 3. Use of low-quality fuel; 4. Poor fuel line flow; 5. Insufficient driving skills. The gears in an automatic transmission car include: 1. S gear (Sport mode), suitable for highway driving or overtaking. S gear and D gear are two driving modes of the car, where the automatic gear shifting is delayed in S gear; 2. L gear (Low gear), suitable for automatically controlling the car's speed when going downhill.
I've encountered many cases of automatic transmission stalling, and the most common issue is fuel system problems. For example, an aging fuel pump or a clogged fuel filter can cut off the fuel supply, causing the engine to stall. The electrical system is also crucial—severe spark plug carbon buildup or leaking high-voltage wires can cause ignition system failures leading to stalling. Sensor malfunctions are another culprit; if the crankshaft position sensor fails, the engine control unit won't receive engine speed signals and will shut down automatically. Don’t overlook small components either—a throttle body as dirty as a range hood can restrict airflow and cause stalling. If this happens, stay calm, grip the steering wheel, pull over slowly, and immediately turn on the hazard lights.
