1. Failure phenomenon
When the engine is running or the car is running, it will automatically turn off, and there is not much difficulty in restarting.
2. Common causes of failure:
1) Vacuum leakage in the intake pipe.
2) Idle speed instability caused by improper idle speed adjustment, dirty throttle body, and poor idle speed control system.
3) The fuel pressure is unstable, such as excessive wear or poor contact of the electric fuel pump brush, or the fuel pump filter is blocked.
4) The exhaust gas recirculation valve is blocked or the bottom is leaking.
5) The fuel pump circuit, fuel injector drive circuit and other circuits have faults such as poor contact.
6) Defective fuel pump relay, EFl relay, ignition relay, etc.
7) The ignition system is not working properly. For example, the high-voltage fire is weak, the spark plug has been used for too long, the ignition timing is incorrect, the ignition coil is in poor contact or there is a short circuit between turns in the hot state, resulting in no high-voltage spark or weak high-voltage spark, poor contact in the low-voltage line, and damage to the insulating glue.
8) Defective throttle position sensor.
9) The air flow meter or intake pressure sensor is faulty.
10) The coolant temperature sensor and oxygen sensor are faulty.
11) The crankshaft position sensor is faulty, if there is no speed signal (plug is not plugged in, the crankshaft position sensor signal line is broken, the sensor positioning screw is loose, the gap is out of adjustment, the sensor is damaged, etc.); the crankshaft position sensor signal ring gear is broken, which will cause acceleration The temperature stability of the electronic components in the crankshaft position sensor is poor, which will cause the signal to be abnormal and cause intermittent flameout failure.
12) The ECU is malfunctioning.
