Why Does the Engine Buzz at 100 km/h on the Highway?

[LaJameson]

Here are the reasons why the engine buzzes at 100 km/h on the highway: 1. Engine knocking: It is a sound similar to metal knocking, also known as cylinder knocking. The causes of the fault can be divided into three types: unqualified fuel, using inferior fuel or fuel with an excessively low octane rating; incorrect engine timing control, such as an excessively large ignition advance angle; excessive carbon deposits inside the engine. You can first try carbon cleaning through non-disassembly cleaning or high-speed driving. 2. Valve noise: After starting the engine, there is a "ticking" sound, which is the sound of the valves, especially when the engine is cold. This is because the oil pressure has not yet built up, and the valves are not properly lubricated. 3. Engine "backfire" fault: When the car decelerates and the throttle is released, there is a "popping" sound, which is the engine "backfire" fault, also known as engine "backfiring". Excessive carbon deposits on the valves or incorrect valve timing can cause abnormal noises. 4. Engine misfire: If one cylinder is not working, the engine will become unbalanced and produce abnormal noises, accompanied by severe engine shaking, insufficient power, and other faults. This may be due to faults in the ignition module, spark plugs, or fuel injectors, and the corresponding parts should be replaced.