What Causes Frequent Engine Stalling?

[MacLeo]

There are multiple potential causes for engine stalling, primarily including the following points: 1. Excessive carbon buildup in components such as the throttle body, idle speed control valve, intake manifold, and combustion chamber can lead to engine stalling. Excessive carbon deposits and dirt in the intake manifold alter the cross-sectional area of the air passage, preventing the control unit from precisely regulating idle air intake. This results in an overly rich or lean air-fuel mixture, causing the engine to fail to start. 2. Poor fuel pressure maintenance in the electronic control system and low fuel pressure lead to inadequate fuel atomization, making the engine difficult to start. 3. Abnormal resistance in the crankshaft position sensor causes the crankshaft speed signal to disappear after the engine warms up, resulting in engine stalling. 4. Malfunction of the fuel pump, where resistance changes after prolonged operation, prevents normal operation and fails to provide adequate fuel pressure, causing the engine to stall when warm. 5. Ignition system failure, overheating of the ignition module leading to malfunction, or loss of ignition voltage can cause the engine to stall. 6. Abnormal throttle position sensor signal voltage or improper engine control by the ECU can lead to stalling while driving. 7. Intermittent electrical connections may cause sporadic engine stalling, requiring a comprehensive inspection to diagnose such issues.