What s wrong with Jetta cold start engine squeak?

Some engine noises change with the condition of the vehicle, but the most noise comes from the engine's lubrication system. Mainly due to the nature of the oil and abnormal maintenance

1. Carbon deposits, solid carbon-like substances with large thickness in high-temperature areas such as cylinder heads, fuel injectors, and piston tops.

2. Paint film, the piston ring and piston skirt, due to high temperature and metal catalysis, the production of gum.

3. Oil sludge is formed with impurities entering the engine under low temperature and low pressure, which also has a certain relationship with crankcase ventilation, so it is necessary to replace the air filter regularly.

There is also the wear and tear of the engine will also increase the noise of the engine, for the noise when the air conditioner is turned on, the main ones are:

1. The increase of load, about this model will consume about 2 horsepower of engine power.

2. The work of the system, the operation of the electronic fan when the air conditioner is working.

It is recommended that you check whether the generator belt is aging and loose, the generator belt is stiff in the case of a cool car, if it is loose and will cause slippage, it is recommended that you adjust the tensioner first, if not, it is recommended to replace the belt. Secondly, check the starting motor, due to the cold weather, the front armature bearing is slow to return, there is a sound of teething, it is recommended that you check it.

The valve drum has pressure relief, and if the hot car does not sound, it can not be repaired, and it can be maintained on time [If you have a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

Possible reasons for the abnormal noise of Jetta cold start:1. Whether the oil has not been changed for a long time is caused by the deterioration of the oil quality.

2.It may be caused by the aging of the belt. 3.

Check whether the exhaust pipe is leaking, whether the engine is missing, and whether the engine has resonance.

Many new owners of Volkswagen Jetta will suspect that the car engine is making an abnormal noise when the front lid is idle when it is opened. If you can't hear this sound in the car, don't make it too loud, it's usually the sound of the valve or injector. The canister solenoid valve also has this sound, but the sound is relatively brittle.

There is a way to distinguish between them, which is to give some oil at idle and see if the frequency changes. If the frequency remains the same, it is the sound of the solenoid valve, and if the frequency changes, it should be the abnormal sound at the jujube search valve. If you can't hear clearly in the car, it's not a big deal.

The car will have a corresponding click, one is the sound of the injectors working, one is the sound of the valve position, and there is a similar sound, which is the sound of the timing chain, but it is not the same as the click, and there is also a glagla sound. Generally, when a car starts cold, the engine will be a little louder than a hot car. As long as the voice is even, soft and not harsh, there is generally no question asked.

This is because the gap between the cylinder wall and the piston has not reached the optimal size when the car is cold, and the lubrication of the oil is not sufficient. Usually, when the engine block temperature reaches around 95 degrees, the sound returns to normal.

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