The car noise has suddenly increased! Watch out! There could be a problem here!!

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The car noise has suddenly increased! Watch out! There could be a problem here!!

The loud noise of the car engine not only makes the driver irritable, but also may be a precursor to the car's problems. Today, let's take a look at why car engines are noisy and how to fix them.

One: the engine is noisy when it is cold started

Phenomenon: When the car is started after being parked for a long time, the engine will produce a violent vibration, and then issue a "rattling" noise.

Reason: Because the oil flows to the oil pan after the car is parked for a long time, the oil pump can not establish oil pressure immediately when the cold car starts; In particular, the valve inside the cylinder head is not sufficiently lubricated when the cold car starts, and the hydraulic tappet and mechanical rocker arm are not working properly, leading to the rattling sound.

Solution: The noise at this time is normal, and the engine will return to normal after starting.

Two: Oil specifications and models do not match

Phenomenon and causes: When the viscosity of the oil is too high, it is easy to lead to insufficient oil supply and poor lubrication, resulting in dry friction during the operation of the engine, resulting in noise.

Solution: Replace the oil with a smaller viscosity grade.

Three: the belt tightness is not enough

Phenomenon and cause: When the tightness of the engine belt is not enough, the engine will produce a squeaky sharp noise in the work.

Solution: Adjust the engine belt tightness or replace the belt.

Four: There is leakage in the inlet and exhaust pipe

Phenomenon and causes: When the intake and exhaust pipes leak, start the engine, the intake and exhaust gas will leak from the damage, resulting in vibration and noise.

Solution: Check the inlet and exhaust pipes, replace the inlet and exhaust pipes or tighten the connections.

Five: poor fuel quality when refueling

Phenomenon and causes: When the poor quality of fuel is used, the combustion situation in the engine will become worse, so that the engine will produce violent vibration and noise.

Solution: Change gas stations or use higher-rated fuel.

Six: Abnormal engine noise

Cause analysis and solution:

1, the engine lower protection plate screws loose, the engine will shake violently and produce noise when working; This is a common glitch, tighten or adjust the engine lower guard screws.

2, the engine claw pad aging. The claw pad plays a role in supporting the engine, and it cannot work properly after aging and cannot be repaired, so it can only be replaced with a new claw pad.

3, engine "backfire" failure. When the valve of the engine has too much carbon or the timing is not adjusted correctly, the engine will have a "pupupupupu" sound, and it is necessary to clean the valve carbon deposit and adjust the valve timing.

Seven: Loose plastic parts in the engine compartment

1, loose plastic parts: the engine compartment has many plastic parts such as the engine cover plate, intake pipe, etc., when it is loose, it will collide with the engine compartment in the engine studio and produce noise, and the tightening can avoid noise.

2, engine noise is inevitable, because it is mainly transmitted to the cab through the hood, front fender and other vibrations. Therefore, some advanced sound-absorbing foam materials can be added to the engine cover, which can not only suppress the vibration caused by the hood, but also absorb a lot of noise, which is very effective.

These are the reasons and solutions for the sudden increase in engine noise. If you encounter it, please repair it in time to avoid developing into a bigger accident.