What Causes Abnormal Noises in the Engine?
2 Answers
Abnormal noises in the engine can be caused by exhaust pipe leakage, dirty throttle valve, or engine misfire. Below are detailed explanations: Exhaust Pipe Leakage: When there is a leakage in the intake or exhaust pipe, the vehicle produces a loud roaring noise as the exhaust rate increases during acceleration. In this case, the exhaust pipe needs to be inspected and replaced. Dirty Throttle Valve: During acceleration, the engine load increases, requiring the throttle valve to open wider and more fuel to be injected. If the throttle valve opening is not optimal due to dirt blockage, it can result in poor air-fuel mixture ratio, causing noise during acceleration. Cleaning the throttle valve is necessary in this situation. Engine Misfire: Engine misfire refers to one or more cylinders not functioning properly, often manifesting as insufficient vehicle power and severe shaking of the exhaust pipe, accompanied by distinct thumping noises from the engine. Inspection and replacement of the engine cylinder are required in this case.
I've been into cars for almost ten years, and engine noises are something I often encounter. The most common ones are the ticking or knocking sounds when piston rings are worn or valve clearance is too large—it sounds like metal parts hitting each other. When the timing chain is loose, it makes a clattering friction noise, and prolonged wear makes it worse. A worn water pump or aging belts can also produce humming or squealing noises, especially noticeable after a cold start. If the engine oil is insufficient and lubrication is poor, the engine will generate extra friction noise. My advice is to take it to a reliable repair shop for inspection immediately—don’t delay, or a minor issue could turn into a major, costly repair. Regular oil changes and belt inspections can prevent a lot of trouble.
