The car engine is loud. What caused it?

The causes and solutions of engine jitter in private cars are as follows:

1, engine cold start: after the cold car is parked outdoors for a long time, the engine will vibrate violently, and then make noise. Because the lubricating oil basically flows to the bottom shell at this time, the oil pressure can't be established immediately, and the lubrication is insufficient when starting, which leads to clicking sound. Solution: The noise at this time is normal, and it will return to normal as long as the engine is started for a while.

2. The oil viscosity is too high: the temperature is low in winter, and the oil concentration becomes thicker. In particular, adding inferior engine oil can easily lead to problems in engine operation, and poor lubrication can lead to engine friction, thus generating noise. Solution: You need to change the oil at this time. And be sure to add qualified engine oil, otherwise it is likely to scrap the engine!

3. Insufficient belt tightness: In cold weather, the belt will be tighter than usual. When the engine belt is not tight enough, the engine will produce sharp noise, which will seriously affect the driver's driving experience. Solution: At this time, it is necessary to properly adjust the belt tightness to avoid the belt from collapsing.

4. Exhaust pipe leaks: The exhaust pipe leaks. When the engine starts to intake and exhaust, the gas will leak from the leaking place, resulting in vibration and noise. Solution: You can try to replace the interface pad first, because the air leakage may be caused by the aging of the interface pad. However, when several interface pads are changed and they don't work, you need to check them carefully.

5. Poor fuel quality: Poor fuel quality will worsen the combustion of the engine, causing the engine to vibrate violently and make noise. Solution: At this time, noise can be avoided by replacing the fuel with better quality.

6. Aging of engine parts: the screw of the lower guard plate of the engine is loose, and the engine cannot be fixed, which will shake violently and produce noise when working. Solution: Just tighten or adjust the screw of the engine lower guard plate.