Why does the car stall while driving?
1 Answers
The main reasons for vehicle stalling can be categorized into the following four types: 1. Fuel system issues: During normal engine operation, the fuel pump draws fuel from the tank, passes it through the filter into the distribution lines, and then sprays it through the injectors to form an air-fuel mixture. In this process, the fuel pump and injectors are the most prone to failure, followed by filter and fuel line blockages. Please focus on inspecting these two areas. If necessary, clean the fuel lines. To reduce such occurrences, always refuel at reputable gas stations with the correct grade of gasoline, and ensure timely refueling to avoid letting the fuel level drop below the red line. 2. Throttle body blockage: The throttle body is undoubtedly the most critical component and also the most problematic. Generally, maintenance personnel will consider cleaning the throttle body. However, if frequent cleaning doesn't resolve the stalling issue, it usually indicates a fault. Additionally, check the vacuum pump to ensure normal air intake. 3. Abnormal spark plug ignition. Replace spark plugs according to their service life. In gasoline engines, the combustible mixture is ignited by the spark plug near the top dead center of compression. Therefore, when the spark plug fails to function, it naturally causes the vehicle to stall. Typically, replacing the spark plug completely solves the issue. When replacement is inconvenient, temporary solutions like cleaning the electrodes or adjusting the central electrode length can be used as emergency measures. Furthermore, insufficient battery voltage, leakage, faulty ignition coils, or wiring issues can all lead to poor ignition or stalling. 4. Sensor faults causing ECU protective fuel cut-off. Check whether all sensors and actuators are functioning properly. Key sensors include the throttle position sensor, oxygen sensor, and crankshaft position sensor. If the crankshaft position sensor has been replaced, also check if the oxygen sensor is contaminated. Therefore, it is recommended to conduct a comprehensive inspection at a 4S shop, focusing on the spark plugs, fuel pump, and oxygen sensor, followed by ECU matching.
