What Causes Noise in a Car Engine?

[Sid]

Reasons for noise in a car engine: 1. The car has been parked for a long time; 2. The engine belt tension is insufficient; 3. The oil viscosity is too high; 4. There is a leak in the intake or exhaust pipe; 5. Poor-quality fuel is used; 6. The engine underguard screws are loose, and the engine cannot be fixed properly; 7. The engine does not get sufficient release, leading to carbon buildup; 8. The throttle valve is dirty. Solutions for noise in a car engine: 1. Adjust the tension of the engine belt; 2. Inspect and replace the intake or exhaust pipe if necessary; 3. Tighten or adjust the engine underguard screws; 4. Regularly maintain the car on schedule.

[McAlexander]

As someone who has long studied vehicle performance, I find engine noise issues quite common. The most frequent cause is insufficient lubrication, such as low or degraded engine oil, which increases friction between internal engine components and produces a scraping-like noise. Another category is aged or improperly tensioned belts—if you hear a squealing sound, it’s likely the alternator belt is about to snap. Exhaust system leaks or looseness can also cause a roaring noise, especially during hard acceleration. Worn internal bearings, possibly from piston or crankshaft failure, may result in rhythmic clicking sounds. Other causes include poor cooling leading to abnormal fan operation or intake pipe leaks. I believe that if the noise worsens, promptly check the oil and replace damaged parts to prevent engine overheating and damage, as this affects longevity and safe driving. Addressing it early saves both hassle and money.

[DiWilliam]

I've been driving for half my life and have encountered strange engine noises a few times. For example, last year during a countryside drive, the front of the car suddenly started squeaking. After stopping to check, I found the belt was worn and loose—replacing it with a new one made everything quiet again. Another time, there was a rumbling noise when I pressed the accelerator hard, which turned out to be a small crack in the exhaust manifold causing noise from leaking hot gases. After repairing it, the issue was resolved. Regular maintenance can help reduce such problems. I make it a habit to inspect the mechanical parts every 5,000 kilometers. When noises occur, it's best not to ignore them; pull over and check before continuing to avoid minor issues turning into major repairs. Mechanics often say these noises are signs of aging, and proper maintenance can extend the car's lifespan by several years. Looking back on these experiences now, they were quite educational—driving safety is more important than anything else.

[Wyatt]

I believe that when the engine makes unusual noises, it should never be taken lightly. It usually indicates a problem with the lubrication system, such as insufficient oil or worn piston rings, leading to increased friction sounds; a faulty belt can produce a squeaking noise like a mouse; and an exhaust leak results in a low-frequency rumbling sound. If left unrepaired, these issues may lead to more severe failures like engine overheating or breakdown, which is especially dangerous on highways. It is recommended to perform regular maintenance, including oil changes and component inspections, and to promptly visit a reliable repair shop if any abnormal sounds are detected. Ensuring driving safety is non-negotiable, as preventive maintenance should always be the top priority in daily vehicle use.