1. Cause analysis:
Mainly due to incorrect ignition advance angle, low fuel pressure, air leak in the intake system, A faulty throttle position sensor or air flow sensor and a malfunctioning fuel injector. , the EGR system is not working properly.
2. Troubleshooting Steps:
1. After starting the engine, check to see if the “Check Engine” warning light goes out.
2.1 If the light does not go out, check the cause and location of the fault according to the fault code.
2.2 When the light goes out, check the fuel system oil pressure, injector working condition and gasoline quality.
3. Check if the ignition timing is too delayed.
4.1 Ignition timing is normal.
4.2 Ignition timing delay is too long, check whether knock sensor and ECU soundt normal.
5 Check if the EGR system is normal.
6. Check if the intake and exhaust systems are blocked.
7. Check whether the signals from the air flow sensor, throttle position sensor, crankshaft position sensor, camshaft position sensor and oxygen sensor are normal.
8.1 is abnormal, check the sensor failure.
8.2 Normal, check the ignition high pressure and ignition energy during acceleration.
9.1 If the high ignition voltage and ignition energy are abnormal, follow the troubleshooting of the ignition system.
9.2 High ignition pressure and ignition energy are normal. Check ignition timing, cylinder pressure and engine mechanical failure.