
Reasons for abnormal noise in Corolla engine: Insufficient engine oil: Leads to inadequate lubrication of components, causing wear noise. Adding engine oil can solve this issue. Poor fuel combustion: Low injection pressure, injector dripping, poor fuel atomization, or delayed fuel supply timing can all cause poor combustion leading to engine knocking. The injector should be removed for inspection and adjustment, and fuel supply timing should be adjusted. Replace components if necessary to meet specifications. Premature fuel supply: When fuel injection starts before the piston reaches the designated position, causing premature combustion. High-pressure gas in the cylinder impacts the piston, producing rhythmic knocking sounds. Reducing throttle makes knocking obvious. Adjusting the fuel injection advance angle can solve this problem.
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