What Causes Loud Engine Noise in a New Car?
4 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.
I just bought a new car, and after driving it for a few days, I noticed the engine noise is quite loud. As a veteran driver with over 20 years of experience, I have to say this is actually quite common in new cars. It could be that the engine components are still in the break-in period—parts like pistons and cylinders need some time to fully seat properly, otherwise, friction noise can be noticeable. Another possibility is that some screws weren’t tightened properly during assembly or the wrong oil was used, leading to insufficient lubrication and unusual noises. Also, design differences between car models play a role—economy cars generally don’t have the same level of sound insulation as luxury vehicles, so noticeable noise in city driving is normal. My advice is to monitor it for a few hundred kilometers first. If the noise doesn’t decrease or even worsens, then it’s best to visit the 4S shop for a thorough check of the engine system and fluid conditions. Don’t take it lightly—safety comes first.
After bringing this new car home, the engine roars loudly upon starting, which honestly affects the driving pleasure a bit. I think it might be related to the break-in period—since the car is fresh from the factory, the engine components are new and insufficient lubrication can lead to noise. It could also be due to my somewhat aggressive driving habits, frequently pressing the accelerator hard, which puts more strain on the engine. Additionally, check if the air conditioning or fan system is turned on, as their noise might be mistaken for the engine's. Don’t worry, the noise should decrease after normal driving for a while, and highway driving can help with the break-in effect. If still concerned, just mention it to the technician during maintenance—simple and hassle-free.
The new car's engine is noisy, possibly because the break-in period isn't over yet and the parts are still tight and making sounds, or there might be installation issues like loose fasteners; sometimes poor fuel quality and inadequate lubrication can also cause loud noises. From my own experience, it's best to drive it for a while and observe. If the noise persists, it's time to check the engine and chassis system—don't delay as it could affect safety.
