What causes the severe abnormal noise in the VV7 engine?

[MicahRose]

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.

[AidenLynn]

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.

[OBeau]

I have personal experience with severe engine knocking. Last time my car also made a clunking sound from the engine compartment after starting, which scared me into shutting it off immediately. Main considerations include whether the belt is loose or cracked, especially since the power steering pump belt tends to produce abnormal noise before breaking; then there's the water pump issue—when the bearing fails, it creates a humming sound during acceleration; clogged fuel injectors can also cause the engine to rattle accompanied by shaking; also, don’t forget to check if the engine mounts are aged, as insufficient support can amplify engine vibrations. I recommend stopping the car immediately and taking it to a professional shop for diagnosis, using a stethoscope to pinpoint the noise source. During daily driving, avoid prolonged low-RPM operation, which can easily increase carbon buildup. During maintenance, remember to clean the throttle body, and keeping the air filter in good condition can reduce the risk of intake pipe noise.

[VanJake]

I'm quite concerned about safety when encountering severe engine noises. First, troubleshoot basic issues: open the hood, start the engine, and listen for the source of the sound. If it's a sharp noise from the front, it might be an issue with the alternator belt; metallic knocking sounds from inside the cylinders could indicate low oil levels or timing chain wear; roaring noises are usually due to exhaust leaks or turbocharger failure. I once experienced an intake manifold leak, which produced a hissing sound that became more noticeable when accelerating. It's advisable to visit a 4S shop as soon as possible for a computer diagnosis, check historical fault records, and inspect the oil level. In daily maintenance, regular oil changes are particularly crucial, and using certified 5W-40 full synthetic oil can effectively reduce wear-related noises.

[DeLydia]

My car had noticeable abnormal noises before, and the inspection revealed several common causes. The most common is belt-related issues: worn-out generator belts, AC belts, etc., which produce a harsh friction sound. Secondly, wear in the valve lifters can cause a metallic ticking sound. There's also abnormal noise from the chain tensioner due to insufficient oil supply from the oil pump. Other possibilities include the clicking sound from a damaged carbon canister solenoid valve or a muffled noise from uneven fuel supply due to clogged fuel injectors. It's recommended to start with the simpler fixes, like replacing the belts and tensioner pulley first. If that doesn't work, then inspect the valve train and lubrication system. A reminder to everyone: never use low-quality engine oil, ensure oil changes and maintenance approximately every 6,000 kilometers, and regularly clean carbon deposits to prevent abnormal noises.