What Causes Engine Noise When Accelerating?
2 Answers
Engine noise when accelerating may be caused by the following reasons: 1. Deteriorated engine oil. Engine oil is known as the "blood" of a car. If the oil hasn't been changed for a long time or has deteriorated, it will increase friction between cylinder valves and guides, as well as in hydraulic lifters, resulting in abnormal noise when accelerating. 2. Faulty drive shafts. Under long-term torsional fatigue and impact forces, drive shafts are prone to bending, twisting, breaking, or wear and misalignment of spline teeth. This can cause rhythmic shaking of the car's front end accompanied by abnormal noise when accelerating within a certain speed range, with the shaking disappearing or reducing when releasing the accelerator. 3. Loose or slipping belt. A slipping belt will produce abnormal noise. Once a belt slips, the resulting friction heat will cause the belt to stretch further, worsening the slipping and creating a vicious cycle. Solution: Visit an auto repair shop to check and replace engine oil, inspect drive shafts, and adjust or replace belts.
I've been driving for nearly twenty years and have encountered several situations where the engine makes unusual noises when accelerating. The most common one is a squeaking sound caused by aging or loose belts, especially prone to slipping on rainy or humid days; another is bearing wear, such as in the alternator or AC pulley, producing a rustling noise when rotating; there could also be vibration sounds due to a loose exhaust system. I've tried emergency fixes myself, like pulling over to check belt tension and using a flashlight to look for cracks. But if the issue is internal, like piston ring problems or fuel pump noise, I head straight to a professional shop for inspection—never wait until breaking down on the road. Safety always comes first. Regular maintenance can reduce such failures, so I replace belts annually to prevent accelerated aging.
