What Causes Loud Engine Noise in a New Car?
1 Answers
Reasons for loud engine noise in a new car: 1. Oil strainer issues, such as poor sealing of the rubber ring, which prevents the oil pump from properly drawing oil and instead sucks in a large amount of air. This leads to insufficient lubrication in the engine system, especially in the hydraulic valve lifter section, resulting in metal knocking sounds. A clogged oil strainer can also prevent proper oil intake into the engine lubrication system, causing poor lubrication. 2. Abnormal operation of the oil pump, which fails to draw in oil, leading to poor lubrication in the engine lubrication system. 3. Damage to the hydraulic valve lifter section due to prolonged abnormal operation of related systems, resulting in insufficient lubrication and component failure. 4. Most common engine noises depend on the engine's speed state. Noises may only occur at idle or low speeds; they may become chaotic at a certain speed, with brief sounds emitted during rapid deceleration. Noises may also appear during rapid acceleration and persist at high speeds. 5. Engine noise faults are often clearly related to the engine's working cycle, especially noises from the crankshaft connecting rod mechanism and valve train. Typically, noises caused by gaps unrelated to the working cycle are often due to faulty engine accessories. Continuous metal friction sounds unrelated to the working cycle may indicate issues with certain rotating components.
