Engine Knocking

1. Defective ECU.
2. Open or shorted fuel injector circuit.
3. Stuck fuel injector.
4. Defective fuel pump main relay.
5. Poor fuel pump ground.
6. Incorrect fuel line pressure.
7. Clogged fuel filter.
8. Open or shorted coolant temperature sensor circuit.
9. Defective coolant temperature sensor.
10. Open or shorted throttle angle sensor circuit.
11. Defective throttle angle sensor.