What Causes the Engine to Make an Intermittent Buzzing Sound?
1 Answers
Introduction to the causes of intermittent buzzing sounds from the engine: 1. Engine knocking: This is a sound similar to metal striking, also known as piston slap. The causes can be divided into three types: substandard fuel, using inferior fuel or fuel with an octane rating that is too low; incorrect engine timing control, such as excessive ignition advance angle; excessive carbon deposits inside the engine. You can first try carbon cleaning through no-disassembly cleaning or high-speed driving. 2. Valve noise: After starting the engine, a "tapping" sound is heard, which is the sound of the valves, especially when the engine is cold. This occurs because the oil pressure has not yet built up, and the valves are not properly lubricated. 3. Engine "backfire" issue: A "popping" sound when decelerating or lifting off the throttle is an engine "backfire" issue, also known as engine "backfiring." Excessive carbon deposits on the valves or incorrect valve timing can cause this noise. 4. Engine misfire: If one cylinder is not working, the engine will become unbalanced and produce abnormal noises, accompanied by severe shaking, lack of power, and other issues. This could be due to faults in the ignition module, spark plugs, or fuel injectors, and the corresponding parts should be replaced.