Reasons for Abnormal Noise During Acceleration

[DelGeorge]

Reasons for abnormal noise during acceleration are as follows: 1. Engine knocking: Carbon deposits accumulate on the top of the piston, forming a highly intense hot surface. At this point, the fuel-air mixture entering the combustion chamber starts self-igniting prematurely due to the carbon deposits before reaching the ignition stroke. Although this combustion appears thorough, it is actually self-ignition and premature ignition, not burning within the designated stroke, resulting in metal impact sounds between the piston and cylinder wall, commonly referred to as 'knocking'; 2. Insufficient engine oil or low oil pressure: Friction between the valve and guide or hydraulic lifters can cause noise. Extended reading: Factors leading to knocking include excessive carbon deposits; ignition timing that is too early; driving at low RPM in high gear; or using gasoline with a low octane rating may trigger such faults.