What Causes the Rattling Sound When Accelerating?
2 Answers
The rattling sound when accelerating can be caused by: abnormal noises from the exhaust pipe, issues with the CV joint (constant velocity joint), or an improperly secured air filter. Problems with the oil-gas separator can also lead to unusual sounds when pressing the accelerator. It is recommended to visit a repair shop as soon as possible for a detailed inspection and repair. Damage to the car's half-shaft can also cause abnormal noises when accelerating, such as twisting or breaking of the half-shaft, wear on the spline teeth, etc. Additionally, a loose engine belt can lead to idling noises when accelerating, so check the engine oil. If the engine oil has not been changed for a long time or has deteriorated, it can increase friction between the cylinder valves and guides, as well as hydraulic lifters, resulting in abnormal noises when accelerating.
I've been driving for almost twenty years and have encountered the throttle making a rattling noise several times. It's most likely due to a dirty throttle body or air filter with too much carbon buildup, affecting the air intake. Sometimes it's a loose or slipping belt, which is especially common in older cars. I remember the last time my car made that noise, it turned out to be a faulty belt tensioner. A small issue left unattended almost ruined the alternator later. It's best to drive to a shop and let a mechanic listen to it. What you can do yourself is check the belt for cracks and maintain regular maintenance to prevent issues. Don't take it lightly—such unusual noises could indicate engine or drivetrain problems, and delaying repairs could cost more and be dangerous. Safety first, I suggest not tinkering with it yourself and getting it checked as soon as possible.
