Volkswagen Lavida 1 4 t This car engine is so loud

When diagnosing excessive engine noise, the first step is to rule out the noise caused by accessories, such as those generated by air compressors and power take-offs, and do not mistake these noises for engine noise. Remove the accessory drive belt to exclude noise caused by these units. Noise can also spread to metal parts that would otherwise be fine.

Therefore, the use of a stethoscope will help to determine the location of engine noise. If the noise varies with the speed of the crankshaft (engine speed), the noise may be related to the crankshaft, connecting rods, pistons, and piston pins. If the noise heard varies with the camshaft speed (half speed of the engine), the noise may be related to the valve transmission components.

A hand-held digital tachometer can help determine if the noise is related to a component running at the speed of a crankshaft or camshaft. Engine noise can sometimes be isolated by removing the plunger of one injector at a time. If the noise volume decreases or disappears, then that noise is related to that particular engine cylinder where it is located.

There is no set rule or test method for determining noise. Engine-driven components and accessories, such as gear-driven fan clutches, hydraulic pumps, belt-driven chargers, air conditioning compressors, and superchargers, can contribute to engine noise. The following information can be used to guide the diagnosis of engine noise:

Main Bearing Noise The knocking noise caused by the loose main bearing can be heard when the engine is under load, and its sound is loud and dull. If all the main bearings are loose, a loud, short knocking sound will be heard. This percussion sound is regular and varies with the rotational speed.

This noise is loudest when the engine is dragging or driving under heavy loads, and this knocking sound is druffier than the noise produced by the connecting rod. Low oil pressure will also accompany this. If the bearing is not loose enough to produce a knocking sound on its own, if the oil is too thin or if there is no oil on the bearing, the bearing will produce a knocking noise.

An irregular noise may indicate crankshaft thrust bearing wear. Intermittent sharp tapping is an indication that the crankshaft clearance is excessive. Repetitive clutch action may cause a change in this noise.

Connecting Rod Bearing Noise Excessive linkage clearance can cause knocking noise at various engine speeds, i.e. idle and load conditions. When bearings begin to become loose, this noise can be confused with the sound of a piston slapping or the noise of a loose piston pin. The volume of noise increases with the speed of the engine.

Low oil pressure will also accompany this. Piston Noise The most difficult part is to point out the difference between piston pins, connecting rods, and piston noise. A double-click sound caused by a loose piston can usually be heard when the engine is idling.

When the injectors of this cylinder are removed, the sound of this knock will change significantly. However, on some engines, this knocking sound becomes more pronounced instead when the vehicle is driving on the road at a steady speed.

German car supercharged engine Due to the small displacement and heavy body, when the turbo does not intervene in the work, it is like a naturally aspirated engine, dragging by a small displacement, so the engine runs too fast, and the sound is naturally louder, but you pay attention to the tachometer, after two thousand rpm, after the turbine intervenes in the work, is the sound slowly quieter?

The space is wide and the workmanship is exquisite, and the engine is better than the new Bora, and the safety is very high.

How long has it been since the oil has been changed. Noise, what kind of sound do you mean?

Hello friends. There are many reasons why the engine is loud. This should be considered in the case of a specific vehicle that you have in mind.

I suggest you describe it specifically. For example, your car's. Time of purchase.

Kilometers. Maintenance. These are the basics, and only with all this can we give a simple judgment.

Motor vehicle engine, noisy, and the engine shaking, first of all, to determine the addition of gasoline to use 95, the oil to use fully synthetic oil, if the above two points have been done, the engine is still a problem, then go to the car repair plant to check the oxygen sensor, as long as a new oxygen sensor is replaced, the problem can be solved.

The specific reasons why the engine roars loudly when Lavida accelerates are as follows:

Exhaust pipe leakage:When there is a leak in the intake and exhaust pipes, as soon as the vehicle accelerates, the exhaust rate increases, and the vehicle will have a loud roar.

Throttle is dirty and blocked:When the car accelerates, the load of the engine begins to increase, at this time it is necessary to increase the opening of the throttle, and increase the amount of oil, if the throttle opening is not opened to the best position due to dirty blockage, then it will cause the engine mixture ratio is not good, and the noise is emitted when accelerating.

Engine Missing Cylinder:Engine cylinder deficiency mainly refers to the engine has one or more cylinders that are not working properly, which is generally manifested as: the vehicle is not powered enough, and the exhaust pipe shakes badly, and the engine can be heard clearly"Sudden protrusions"Or the roar of "plopping".

German car supercharged engine Due to the small displacement and heavy body, when the turbo does not intervene in the work, it is like a naturally aspirated engine, dragging by a small displacement, so the engine runs too fast, and the sound is naturally louder, but you pay attention to the tachometer, after two thousand rpm, after the turbine intervenes in the work, is the sound slowly quieter?

Hello, this car and its engine are all voice sounds, this is unavoidable, you can refer to it.

Hello, in the case of low-speed driving, especially with the windows closed, Lavida.

The noise of the engine is relatively light. If the car is not in the case of inertia and no forward momentum, when the throttle is increased very much, the engine noise will be very loud. This is when overtaking at high speed.

Since the noise you said can not be known in detail from your question, according to experience, the noise emitted when the car is cold, it is likely to be the sound caused by the failure of the pump bearing of the cooling water, or the failure of one of the pulley bearings, I have a similar situation before, maybe you ask a professional car repair shop to help you check it! Or please go back to the 4S shop to take a look, it should be solved immediately, I wish you a safe drive!

Summary. The engine has a lot of carbon deposits, and the most common cause of car shake is that the throttle is too dirty or the fuel nozzle has too much carbon deposit. When there is too much carbon deposited in the engine, the gasoline ejected from the cold-start injector is absorbed by the carbon deposit.

2. Engine cylinder shortage: The engine cylinder is mainly due to the abnormal operation of one or more cylinders of the engine, indicating that the exhaust gas flow discharged by the car is obviously intermittent, and the exhaust pipe shakes violently, and the engine shake can be clearly felt, sometimes accompanied by abnormal noise. This is mostly related to ignition coil failure; 3 The engine's flammable mixture is sometimes thin and sometimes thick, causing idle jitter after a cold start.

The lower the temperature, the greater the amount of oil required for the cold start, and the more carbon will be deposited, which will affect the success of the cold start.

The engine has a lot of carbon deposits, and the most common cause of car shake is that the throttle is too dirty or the fuel nozzle has too much carbon deposit. When there is too much carbon deposited in the engine, the gasoline ejected from the cold-start injector is absorbed by the carbon deposit. 2 Engine Missing Cylinder:

The lack of cylinders in the engine is mainly due to the abnormal operation of one or more cylinders of the engine, indicating that the exhaust gas flow discharged by the car is obviously intermittent, and at the same time, the exhaust pipe shakes violently, and the engine shake can be clearly felt, sometimes accompanied by abnormal noise. This is mostly related to ignition coil failure; 3 The engine's flammable mixture is sometimes thin and sometimes thick, causing idle jitter after a cold start. The lower the temperature, the greater the amount of oil required for the cold start, and the more carbon will be deposited, which will affect the success of the cold start.

Hello let me ask, my car is 19 Lavida Plus 280Why is it just waiting for the red light to step on the brakes, and it feels like it will tremble, that is, the interval is about 20 seconds, the lower the temperature, the more obvious, sometimes there is none, sometimes there is?

If the car is waiting for the red light, when the D gear is on the brakes, you must press the brakes to the end, he will not shake, if the car is older, see if it is caused by carbon deposits.

It's only a few thousand kilometers away from this symptom.

The car is not new, if it is a new car, it should be driven back to the 4S store for inspection.

Yes. This goes directly to the 4S store for after-sales.

There is also this symptom of parking idling, and sometimes there is none.

The specific causes of Lavida idle jitter are summarized as follows:1Serious carbon deposits in the engine:

Clean the oil circuit and check whether there is carbon deposit in the idle motor, which should be cleaned. 2.Excessive carbon deposits in the throttle, injectors, and air intakes need to be cleaned up in a timely manner.

3.The fuel quality is not up to standard. Or the cylinder pressure is low, resulting in insufficient power, etc.

Check the oil pressure and replace parts if necessary. 4.Lack of cylinders due to mechanical failures such as ignition systems, ignition coils, spark plugs, and fuel injectors.

Check the spark plug for excessive carbon build-up and replace the spark plug. 5.The idle control valve is damaged or dirty.

6.The engine has too much carbon deposit. Because the structure of carbon deposition is similar to that of a sponge, when the valve depositions carbon, a part of the fuel injected into the cylinder will be adsorbed each time, so that the concentration of the mixture that actually enters the cylinder becomes thinner, resulting in poor engine operation, and abnormal phenomena such as difficult cold start, unstable idling, poor acceleration, fast refueling and tempering, excessive exhaust gas, and increased fuel consumption.

Causes the engine to shake during cold starts.