What Causes the Engine Abnormal Noise in Boyue?

[Willow]

Here are the reasons for the engine abnormal noise in Boyue: 1. Aging or loosening of engine mounts: Engine mounts are used to reduce vibration and buffer during engine operation, as well as to secure the engine. Once these mounts age or loosen, the engine will vibrate, resulting in abnormal noise. 2. Engine misfire noise: This mainly refers to one or more cylinders not working properly, typically manifested as: intermittent exhaust gas flow from the car, severe shaking of the exhaust pipe, and a clear "popping" or "thumping" sound from the engine. This phenomenon is closely related to the failure of the ignition coil. 3. "Piston slap" noise due to poor lubrication conditions: Excessive wear of the piston and cylinder wall leads to the clearance between the piston and cylinder wall exceeding the normal tolerance range. During engine operation, the piston skirt impacts the cylinder wall, producing a clear "clanging" sound, which is usually more noticeable at idle or low speeds.

[Ramirez]

I've experienced abnormal engine noises while driving my Boyue, which could stem from mechanical wear or component failures. For instance, excessive valve clearance produces a ticking sound, something I noticed during cold starts; a loose timing chain is also common, causing a rattling noise during acceleration, and if the chain skips teeth, it can damage the engine. Aged or insufficiently tensioned belts may emit a high-pitched squeal. Worn bearings, such as crankshaft or camshaft bearings, create heavier abnormal noises, resembling dull metal grinding. Piston ring issues can lead to knocking sounds, especially at high RPMs. Fuel pump failures or loose spark plugs may also cause unusual noises. I recommend starting with self-checks: identify the noise location and type, and verify if the engine oil is at the proper level or has degraded. If the noise persists, it's best to visit a professional workshop for diagnostic tool checks to prevent minor issues from escalating. Regular maintenance is crucial—routine oil changes and timing component replacements can prevent such problems, avoiding minor faults turning into major repairs.