What causes the ticking sound in the Chery A3 valve?

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Here are the specific reasons for the ticking sound in the Chery A3 valve: Engine knocking: This is a sound similar to metal knocking, also known as piston slap. The causes can be divided into three types: substandard fuel, using low-quality fuel or fuel with too low an octane rating; incorrect engine timing control, such as an excessively advanced ignition timing, requiring readjustment of the timing; or excessive carbon buildup inside the engine. Valve noise: After starting the engine, there is a "ticking" sound, which is the sound of the valves, especially noticeable when the engine is cold. This happens because the oil pressure has not yet built up, and the valves are not properly lubricated. The sound will naturally disappear after a short while. Engine "backfire" fault: When decelerating and releasing the throttle, there may be a "popping" sound, which could indicate an engine "backfire" fault, commonly referred to as engine "backfiring." Excessive carbon buildup on the valves or incorrect valve timing can cause this noise. Cleaning the valve carbon deposits or adjusting the valve timing can resolve the issue.