Why the Engine noise is increasing?

First: Engine noise when it cold starting
When the car is parked for a long time and then started, the engine produces a violent vibration and then a "da da" noise.

Because the car parked for a long time, the basic oil flow all the way to the oil sump in the cold start the pump can not be established immediately hydraulic, especially inside the cylinder head valve, not enough lubrication in cold start , Hydraulic tappet and mechanical rocker did not work properly before it led to da da sound.

Solution: This time the noise is normal, when the engine starts for a while, the engine will be back to normal, no more severe noise.

Second: the oil situation is wrong
Engine oil is an important component of lubrication, when oil problems can affect the work of the engine. When the oil viscosity is too high, easily lead to engine operation problems, poor lubrication, resulting in engine friction during operation, resulting in noise.

Solution: In the face of such a situation, only need to change the oil on it.

Three: belt tightness is not enough
When the tightness of the engine belt is not enough, the engine produces creaky, sharp noise at work, seriously affecting the driver's driving experience.

Solution: Faced with such a situation, adjust the tightness of the engine belt to avoid noise.

Four: leak into the exhaust pipe
When the exhaust pipe into the exhaust, when starting the engine, when entering the exhaust gas leaks from the leak, resulting in vibration, make noise.

Solution: Faced with such a situation, need to check into the exhaust pipe, replace the exhaust pipe to avoid noise.

Five: poor fuel quality
When poor quality fuel is used, the combustion in the engine will deteriorate, causing the engine to vibrate and produce noise.

Solution: Faced with such a situation, the replacement of better quality label higher and then you can avoid noise.

Six: Engine abnormal sound
Engine under the guard plate screws loose, the engine can not be fixed, the work will be severe jitter, resulting in noise. This is a more common glitch, fastening or adjusting the engine under guard screws, it can be.

Engine claw mat aging. Claw pad play a supporting role in the engine, when aging can not play a normal job, this time can not be repaired, only to replace the new claw pad.

Engine "tempering" failure. When the engine valve too much carbon or timing adjustment is wrong, the engine will have a "pop puff" sound, this time cleaning the valve carbon deposition, adjust the timing valve on it.

Seven: engine compartment plastic parts loose
The engine compartment has many plastic parts such as the engine cover, intake manifold, etc., when they are loose will collide with the engine compartment in the engine room, it will produce noise, this time tightening can avoid noise.

In addition to the above, there is a very common and practical way to reduce engine noise by adding sound-proofing cotton.

Engine noise is mainly transmitted through the hood, front fenders and other vibration to the cab. Therefore, the hood can be installed some advanced sound-absorbing foam material, not only can inhibit the vibration caused by the hood, but also absorb a lot of noise, very effective.