What Causes Engine Noise When Accelerating?
2 Answers
The causes of engine noise when accelerating are: excessive clearance in components like the drive shaft, poor lubrication, or improper assembly during maintenance, which generates friction noise under high torque output. Typically, when the engine is just started, the oil temperature hasn't reached normal operating levels, resulting in viscosity unsuitable for the hydraulic lifter's optimal performance. This reduces the hydraulic lifter's sealing capability, causing noise. The solution for engine noise when accelerating is: fully depress the brake pedal to stop the vehicle, then turn off the engine and contact for assistance. When starting the engine, avoid pressing the accelerator pedal all the way down; it's better to keep it slightly above the idle throttle position.
I've been a car enthusiast and experienced driver for most of my life, and I've encountered quite a few cases of abnormal engine noises when stepping on the accelerator. The sound could be a squeaking noise, like a loose or aged belt, which happens when the tensioner isn't adjusted properly. It might also be a rattling sound, indicating bearing wear, such as issues with the water pump or alternator bearings. A loose exhaust pipe joint causing air leakage can produce a popping sound when accelerating, which can be quite alarming. I once experienced an abnormal noise caused by cracks in the belt—if not replaced in time, it could snap, leading to engine shutdown and much more expensive repairs. Regularly check the belt condition and chassis, visually inspect for signs of wear, and listen to locate the problem. If any issue arises, don't delay—take it to a reputable repair shop for peace of mind and safety. I recommend regular maintenance, with inspections every 10,000 kilometers to prevent minor issues from turning into major failures. After all, the engine is not something to take lightly!
