What are the reasons for the engine starting and then automatically stalling?
3 Answers
Reasons for the engine starting and then automatically stalling: 1. Stalling caused by carbon deposits: Carbon deposits usually accumulate in the throttle valve, spark plugs, cylinders, fuel lines, intake ducts, and other areas; 2. Poor fuel quality and clogged fuel injectors: Using low-quality fuel not only produces more carbon deposits but may also clog the fuel injectors, resulting in poor atomization. Additionally, low-quality fuel directly affects combustion efficiency, increasing fuel consumption; 3. Power supply issues in the ignition system: Common faults include carbon deposits on the spark plugs and insufficient ignition voltage; 4. Abnormal engine control system: If the battery is severely depleted, it can make the engine difficult to start or even prevent it from starting.
When I used to drive that old car, it often stalled suddenly after starting, which was quite annoying. The main reason might be the aging fuel pump, unstable oil pressure, or intermittent fuel supply. Also, burnt spark plugs or ignition coil issues could cause the engine to fail to start. A stuck idle control valve could have the same effect, making the engine stall at low speeds. Additionally, some sensors, like a dirty mass airflow sensor or a faulty crankshaft position sensor, could cause the computer to misjudge and stall the engine. That time it broke down on the highway, luckily I managed to pull over and called a tow truck. Now I regularly check the fuel system and ignition system, and if there's any problem, I go straight to the repair shop to avoid bigger issues. Safety first—small faults left unattended can cause more serious damage to the car.
The engine stalls after starting, usually due to fuel supply or ignition system issues. If the fuel pump fails and cuts off the supply, or the injectors are clogged and can't spray fuel, the engine will shut down. On the ignition side, excessive carbon buildup on spark plugs or a cracked ignition coil can cause failure. The idle control system, like a stuck dirty valve, may prevent the engine from maintaining RPM in neutral. Sensors such as the crankshaft position sensor failing can cause the engine to lose position, prompting the ECU to shut it down. For troubleshooting, start with the basics: check the fuel filter, spark plugs, and measure fuel pressure. If that doesn't work, use a diagnostic tool to read fault codes. Don't keep driving stubbornly to avoid accidents. Using high-quality fuel regularly can prevent such issues.
