Will the Engine Make Abnormal Noises During High-Temperature Idling?
2 Answers
Abnormal noises during high-temperature engine idling are considered abnormal phenomena, and the cause should be promptly identified and repaired. Causes of engine idling noises: Noises caused by excessive clearance. When factors such as lubrication, temperature, load, and speed are constant, the noise becomes more pronounced as the clearance increases. Wear and tear on certain engine components can lead to excessive clearance, resulting in noises such as piston and cylinder wall knocking sounds, or connecting rod bearing and journal impact sounds. Engine misfire primarily refers to one or more cylinders not functioning properly, typically characterized by: intermittent exhaust gas flow with noticeable shaking of the exhaust pipe, accompanied by clear "popping" or "thumping" sounds from the engine. This phenomenon is often related to ignition coil failure. Engine knocking noises, resembling startup knocking sounds, occur when the piston swings or shifts within the cylinder during up-and-down movement, causing its head or skirt to collide with the cylinder wall or head, producing abnormal noises. These can be further categorized as cold knocking, hot knocking, or both. Solutions for engine idling noises: There are many potential causes of engine noises, such as damaged injector seal rings allowing high-pressure gas leakage, faulty electromagnetic valves, air intake system leaks, or insufficient lubrication in the high-pressure fuel pump. Therefore, abnormal noises during vehicle idling can be seen as a signal of mechanical failure. In such cases, it is advisable to visit a professional service center to diagnose the cause and replace any damaged components in a timely manner.
The engine indeed makes abnormal noises during high-temperature idling, which is common in many vehicles I've handled. High temperatures cause metal components to expand, such as the piston and connecting rod gaps becoming smaller, increasing friction and resulting in clicking or squeaking sounds. Engine oil thins out at high temperatures, reducing lubrication effectiveness and making bearing wear noises more noticeable. Issues in the cooling system, like damaged water pump bearings or loose fan belts, can also cause a humming sound. I've seen cases where owners ignored these signs, leading to engine overheating and failure, resulting in costly repairs. It's recommended to stop the vehicle immediately when the temperature is high and check the coolant and oil conditions. If the abnormal noises persist, seek professional diagnosis as soon as possible. For prevention, regular oil changes and cleaning the cooling system can significantly reduce risks and extend engine life.
