What Causes Engine Abnormal Noise at Idle Speed?
2 Answers
Engine abnormal noise can be caused by engine misfire, improper use of engine oil, timing belt noise, insufficient car warm-up time, etc. The following is an introduction to the engine: Relatively small friction torque: The engine valve drive mechanism adopts a hydraulic support roller rocker arm structure. Compared with the hydraulic tappet valve drive mechanism commonly used in current gasoline engines, this novel valve drive mechanism has the advantage of relatively small friction torque. Reduced camshaft weight: The use of a hot-sleeve camshaft not only reduces the weight of the camshaft compared to the original one, but also allows the engine to achieve higher cam profile accuracy and more precise valve timing.
When I first started driving, I encountered a squeaking sound from the engine at idle. After inspection, it might be due to a loose or worn-out belt, especially common in older cars. Other common causes include insufficient engine oil increasing friction between components, such as ticking sounds from excessive valve or camshaft clearance; engine mount looseness causing vibration and humming; or a faulty cooling fan bearing creating noise. I recommend checking the oil dipstick to see if the oil level and color are normal, but don’t delay—visit a professional shop to pinpoint the issue with a stethoscope. Regular oil changes and belt maintenance help prevent such problems. Safety first—don’t ignore unusual noises that could lead to major failures, and always pay attention to changes in the engine compartment while driving.
