What Causes Engine Abnormal Noise?
2 Answers
Here are the causes and solutions for engine abnormal noise: 1. Aging engine mounts, the abnormal noise caused by rough engine operation due to aging engine mounts is triggered by excessively early fuel injection timing, and the fuel injection advance angle should be readjusted. 2. Engine misfire, the engine abnormal noise has a certain pattern, accompanied by unstable engine speed and intermittent black smoke emissions. This uneven abnormal noise is caused by diesel leakage from the fuel injector. When this occurs, the fuel injector should be serviced. 3. Piston slap, the exhaust pipe produces continuous backfire sounds during exhaust, accompanied by black smoke and overheating of the exhaust pipe, making starting difficult. At low speeds, the backfire sound diminishes. This abnormal noise is caused by excessively delayed fuel injection timing, and the exhaust pipe position should be promptly adjusted.
I think engine abnormal noise is quite common. As an ordinary driver, I believe the first step is to identify the type of sound. For example, a ticking sound might indicate a loose timing chain or worn chain guide, especially noticeable during acceleration. A high-pitched squealing noise often points to belt aging or tensioner failure, commonly heard during cold starts. Additionally, a rattling noise could suggest internal component wear, such as damaged connecting rod bearings or loose piston pins, which can harm the engine over time. I once experienced a sudden roaring noise from the engine, and the inspection revealed insufficient oil causing poor lubrication—so regularly checking the dipstick is crucial. For safety, don't push it; visit a repair shop as soon as possible. They can diagnose the issue clearly using a stethoscope. Ignoring these minor problems may lead to more severe component damage, resulting in costlier repairs.
