What causes noise in a small car's engine?

[DelBrantley]

Noise in a small car's engine can be caused by a broken vacuum tube, carbon buildup in the cylinders, or insufficient engine oil. Broken vacuum tube: A hissing sound from the engine, resembling air blowing, may indicate a broken vacuum tube or vacuum leak, which can lead to engine misfire and reduced efficiency. Carbon buildup in the cylinders: One reason for this is the use of low-quality fuel, which produces many impurities during combustion, leading to incomplete burning and deposits inside the engine. Another reason is infrequent oil changes; the longer the oil is used, the thinner it becomes, making it easier for oil to seep into places it shouldn't, causing carbon buildup. Additionally, after changing to new oil, the engine may not adapt to the oil's viscosity, potentially causing higher RPMs and increased engine noise. Insufficient engine oil: If you hear a light tapping or ticking sound from the engine when accelerating, which is not loud but persistent and stops when the car is parked, it is generally due to insufficient engine oil or an uneven valve clearance caused by a long-unreplaced oil filter. First, check the oil level. If it's not low, you may need to visit a repair shop to inspect the valve clearance or perform engine repairs.

[LeSpencer]

I recently encountered engine noise issues with my car too, which was quite bothersome. At first, I thought it might be a belt problem, as rubber belts can loosen over time and produce squeaking sounds. It could also be due to insufficient engine oil, where increased friction causes noise—last time, my car needed an oil change, and after topping it up, the noise disappeared. Other possible causes include a loose chain, a faulty water pump, or worn bearings inside. If there's a tapping sound, it might indicate valve issues. It's best not to delay and take it to a professional shop for inspection promptly, as they have the tools to pinpoint the exact issue and fix it quickly. Otherwise, a minor problem could turn into a major repair. Regularly maintain your car and stay alert to any changes in engine noise—safe driving is the top priority.

[EzraRose]

Engine noise is actually quite common. My small car has been running for over five years, and I've encountered it a few times. Common causes include belt system issues, especially a faulty tensioner that can cause screeching sounds; or lubrication problems—dirty oil or low oil levels can trigger noise, but I avoid this by changing the oil regularly. If there's a rattling sound, it might be due to chain wear; faulty spark plugs can also cause uneven combustion and strange noises. You can perform a simple check yourself: stop the car and listen for the source of the noise, ensuring all fluids are at proper levels. However, it's best not to DIY recklessly—take it to a repair shop for a professional diagnosis with specialized equipment to avoid unnecessary expenses. When driving, avoid sudden acceleration to reduce extra strain on the engine.

[AdrielMarie]

I'm quite worried about the noise coming from the engine while driving my car. It definitely indicates a problem. It could be due to external parts failure, such as a broken belt or malfunctioning water pump; internal issues like worn camshaft or piston rings; or most commonly, insufficient fluids - check if the oil dipstick level is normal. The type of sound is crucial: a scraping noise might mean something is stuck, while a ticking sound suggests chain issues needing repair. I recommend checking it immediately to avoid breaking down on the road; novice car owners who don't understand can record a video to show mechanics. For simple self-help: try adding oil or tightening the belt, if that doesn't work, drive to a repair shop as soon as possible.