What causes the severe abnormal noise in the VV7 engine?
2 Answers
vv7 engine abnormal noise is serious for the following reasons: 1. Aging or loosening of engine mounts: Engine mounts are rubber blocks placed between the engine and the frame to reduce vibration and cushion the engine's operation, as well as to secure the engine. Once these mounts age or become loose, the engine will shake, resulting in abnormal noise. 2. Engine misfire abnormal noise: Engine misfire 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 clear abnormal noise or thumping sounds from the engine. 3. "Piston slap" abnormal noise: Due to poor lubrication conditions, excessive wear of the piston and cylinder wall leads to the clearance fit tolerance between the piston and cylinder wall exceeding the normal range. When the engine is running, the piston skirt collides with the cylinder wall, producing a clear "clanging" sound, which is usually more noticeable at idle or low speeds.
Recently, my VV7 also experienced abnormal engine noise, which was frighteningly loud. This kind of abnormal noise could be due to issues with the belt system, such as the aging or loosening of the alternator belt, which can produce a sharp squealing sound when rotating. It might also be caused by insufficient or poor-quality engine oil, leading to inadequate lubrication of internal engine components, resulting in a metallic tapping sound from friction. Severe carbon buildup in the cylinders affecting operation is another possibility, or a leak in the intake/exhaust system, where a damaged turbocharger pipe can produce a hissing sound. I think the most critical components to pay attention to are the tensioner pulley and idler pulley bearings, as wear in these can cause a continuous humming noise. Upon hearing abnormal noises, it's best to immediately visit a repair shop to check the fault codes and also inspect the spark plugs and ignition coils. Personally, I make sure to regularly change the engine oil and oil filter, performing maintenance approximately every 5,000 kilometers.
