What s the deal with the sound of a car engine?

If you hear a "sizzle" noise while driving, and this is the engine belt.

The abnormal sound caused by the problem, because the "zizi" abnormal sound is mostly the aging of the belt group of the engine, or the belt is too loose caused by the problem of the tensioner, the friction abnormal sound, belt slippage, etc., if there is a similar "zizi" abnormal sound, then look for the major belt groups and tensioners inside the engine, such as the engine timing belt.

Generator belts, circulating water pump belts, air conditioning belts, booster pump belts, etc., and the problem that causes this abnormal noise is the abnormal sound of the engine belt, which is caused by the smooth grinding surface of the joint surface of the belt and the pulley. It usually occurs when the engine speed changes rapidly, and sometimes the belt rings when the load of the attachment driven by the belt increases.

How to solve the problem of abnormal noise of engine belt.

1. Check whether the accessories driven by the belt are damaged, stuck, loose or the power of the accessories has increased.

2. Replace the belt, or use 100 gauze to polish the joint surface of the pulley and the belt (light grinding is fine).

3. The temporary solution can be to drop 1 2 drops of oil on the joint surface of the belt and the pulley (it will not affect the belt slippage).

If it is the generator belt that rings and the headlights are more obvious, you have to take off the generator belt, turn the motor pulley to see if the generator rotates smoothly, if the generator is normal, you can check whether the battery is not stored power, because the battery storage is not good will increase the load of the generator.

Having a sound can be normal or abnormal, soIt needs to be checked to know if it is normal, so the engine is usually sent out. The most common Dada sound is the carbon canister solenoid valve, especially when the cold car starts, the carbon canister solenoid valve is Dada sound, especially the Mercedes-Benz engine. When the cold car starts, the canister solenoid valve is particularly loud, sometimes for about a minute, with some intermittent sounds.

There is also the sound of the solenoid valve of the fuel injector working, and the sound of the solenoid valve switch of the fuel injector is also a clattering sound, but it is not as loud as the carbon canister solenoid valve. The other is a high-pressure oil pump on a direct in-cylinder injection engine. The high-pressure oil pump is also the sound and loud voice of Dada.

The faster the throttle, the faster the sound frequency of the high-pressure oil pump. For example, the high-pressure oil pump of a Volkswagen or Toyota Corolla is very loud, especially when starting cold.

Generally speaking, most of the common Dada sounds mentioned above come from the above three components. Generally, new cars buy some Dada sound, generally normal sound, if the engine after a certain period of time, suddenly appear different Dada sound, then it may be a fault sound. So the engine has these causes of failure.

Engine top valves, engine valve clearance is not within the standard range, there are some accessories on the engine, such as engine belts and tensioners, oil pressure solenoid valves on the engine, camshaft adjustment valves are damaged, etc., and Dada may also be issued. The sound of the high-pressure oil pump is too loud, which is different from the normal working sound, so the high-pressure oil pump will also be damaged.

To judge whether Dada's voice is normal,First of all, look at where Dada's voice comes fromand then see if Dada's voice is different from the previous Dada. If it's really bad, find a car to compare with the same car, or go to a repair shop to find a professional to repair it. In short, Dada doesn't have to be a glitch sound.

However, the normal sound comparison or examination shall prevail. It's normal for a car engine to produce a "click-click-click" similar working sound, but if we can hear it clearly in the cab or outside the car, it needs to be checked.

Point 1: If there is a sound, it is definitely not a normal phenomenon, and it should be checked in time, and the second point is likely to be the engine ** oil leakage, and you should take a look at point 3, it may be that there is a problem with the engine system or the screws are loose.

Under normal circumstances, it is normal for the engine to have sound, because the engine will produce sound when it is running, depending on the engine sound, if the noise will be particularly loud, it may be due to the excessive friction of the internal parts and the increase in noise.

If there is always a sound in the engine, then I think this is a normal phenomenon, and we can go to the repair shop to check it.

1. Engine oil.

If the oil viscosity of the vehicle is too high, it is easy to cause problems with the operation of the engine, and the lubrication effect will become poor, resulting in high engine noise. Therefore, at this time, you should go to the repair shop in time to check whether it is time to change the engine oil, or calculate whether the time for maintenance is up.

2. a transmission belt.

Check to see if the drive belt is loose, sometimes the belt is loose and can cause the engine compartment to become louder. At this time, the transmission belt needs to be replaced in time.

3. Water temperature. If the engine is noisy, it is also possible that the water temperature is too high, and it is necessary to see if the water temperature gauge is normal and whether there is smoke in the engine compartment. Be sure to change the coolant before winter.

4. Idling. If you feel that the noise is relatively loud when idling, and the idle speed of the vehicle is high, it is likely that the throttle, air intake, and fuel injector of your car should be cleaned, especially the throttle.

5. Sound insulation. If you listen to the engine working normally from outside, and feel that the noise is too loud when you sit in the car, it means that your vehicle is poorly insulated. The vehicle's seals should be inspected to see if there is any signs of aging. Or increase the sealing effect of the vehicle.

Many car owners complain that the noise of their cars is getting louder and louder, what is the reason?

When the engine is running, if you hear a "shhh If you hear a "sigh" sound at the exhaust pipe or muffler, it means that there is a leak in the exhaust valve. There are several causes of valve leakage:

1. The working slope of the valve and valve seat is worn and ablated, resulting in spots or depressions and accumulation of carbon deposits.

2. The gap between the valve stem and the valve guide sleeve is too large, and the valve stem shakes, so that the valve is not closed tightly, or the valve stem is bent and deformed, and the valve head is skewed, so that the valve is not closed tightly and causes air leakage, resulting in a "bluff" or "sigh" sound.

3. The elasticity of the valve spring is weakened or loses its elasticity, or the spring is broken, so that the valve and the valve seat ring are not tightly matched.

4. The valve foot clearance is too small, and after the valve stem is heated and expanded, the tappet or rocker arm opens the valve, so that the valve cannot be completely closed and causes air leakage.

Here's why.

If the car does not move for a period of time, the oil will return to the oil pan, and the valve chamber will have less oil, because the valve chamber lacks the sealing and lubrication of the oil, so the car will hear the sound of the bottom of the car when it just starts, which is normal; Check the tightness of the engine belt, you can try to clamp the transmission belt with your fingers, and then twist it at an angle of less than 90 degrees; Loose bolts on the frame caused the engine support to not be properly installed.

It may be that the engine is overheating and the cooling system needs to be checked. Or maybe it's because the exhaust system is clogged and the vacuum tube is leaking. When the engine is running, a "shhh

The reason for the sound of the engine clattering:

1. The leakage sound of the valve nucleus of the engine, because the valve parts are excessively worn, resulting in abnormal engine noise;

2. The pressure of the oil pump is insufficient;

3. The engine oil will become more viscous in winter, and it is not easy to flow and cause abnormal engine noise.

The detection methods are:

1. Control the engine speed in the most obvious range of abnormal noise, and check whether there is smoke from the oil filler;

2. Cylinder-by-cylinder fire breaking test, if the sound of a cylinder is weakened or disappears after the fire is broken, the sound is significantly increased when the fire is refired, and then the original sound is restored after one or two sounds, and the sound can be diagnosed as piston knocking the cylinder when the engine temperature rises;

3. Add the oil test method to remove the spark plug of the cylinder to be checked, add a small amount of oil, and then restart.

The basic maintenance items of the automobile engine are as follows:

1. Change the oil regularly

Engine oil is the lubricant of the engine, which can lubricate, clean, cool, seal, reduce wear and other functions of the engine, and is also the "blood" of the engine.

2. Replace the three filters regularly

The three filters refer to air filters, oil filters and gasoline filters. The three filters can provide the engine with the effect of filtering impurities, protect the engine, and also improve the efficiency of the engine's industrial reform. The regular maintenance interval of the three filters is the same as that of the engine oil.

3. Power steering fluid

Power steering fluid is commonly known as direction oil, and it is necessary to regularly check whether there is any leakage or obvious abnormal noise. Electronically assisted models are maintenance-free, so there is no need to change the steering oil. The maintenance interval of directional oil is about 60,000 kilometers.