Is the engine abnormal noise knocking or valve?

[VonBraxton]

Engine abnormal noise is caused by the valve. There are three points for engine maintenance: 1. Clean the air filter: The air filter is related to the engine's air intake during driving. If the air filter is blocked or accumulates too much dust, it will cause poor engine air intake, and a large amount of dust entering the cylinder will accelerate the formation of carbon deposits in the cylinder, leading to difficult engine ignition, insufficient power, and naturally increased fuel consumption; 2. Remove throttle sludge: The sludge at the throttle is formed by carbon deposits from fuel combustion exhaust and impurities not filtered by the air filter. Excessive sludge will cause air resistance, leading to increased fuel consumption; 3. Clean injector carbon deposits: Because the combustion chamber is prone to carbon deposits, which can cause difficulty in starting, injector carbon deposits can also lead to fuel passage blockage, deformed fuel injection, poor atomization, and naturally increased fuel consumption.