Solution to abnormal noise of Toyota Corolla engine

It may be because the engine oil is insufficient, so adding engine oil can solve the problem. The causes and solutions of abnormal noise of Corolla engine are as follows: 1. There is not enough oil, so all parts can't be lubricated normally. The worn sound can be solved by adding engine oil; 2. Poor fuel combustion: Low fuel injection pressure, fuel injector leakage, poor fuel injection atomization and late fuel supply time will all cause poor fuel combustion and cylinder knocking. The fuel injector should be removed for inspection and adjustment, and the fuel supply time should be adjusted. If necessary, replace new parts to make them conform to the regulations; 3. Advance time of fuel supply: When the piston does not move to the specified position, the fuel injector starts to inject fuel, so that the fuel burns ahead of schedule. The high-pressure gas in the cylinder impacts the piston and makes a rhythmic sound, which obviously reduces the impact of the throttle on the cylinder. This problem can be solved by adjusting the fuel supply advance angle.