What Causes Engine Knocking? What Causes Engine Knocking? - 5sCarRental

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What Causes Engine Knocking?


What Causes Engine Knocking?

Engine Knocking Noise Causes?

As a Istanbul Airport car rental company, we have discussed a content about the question why is a knocking sound in the engine? that drivers wonder. Well, what causes knocking noise in the engine? Details are in our blog.

Knocking noise in the engine can indicate many malfunctions. Therefore, if there is a knocking sound from the engine, a specialist should have the vehicle repaired immediately. This is also very important when there is a knocking sound coming from the engine. What gear, what temperature, what speed range etc. The knocking sound should be evaluated taking into account many conditions. So why is the knocking sound in the engine?

 The only thing we can say for such a detailed problem is; Probably one or more parts of the engine are loose and that's why they're knocking and making noise at every rev these evenings. For this reason, touching should be taken seriously and shown to a specialist as soon as possible. Engine knocking is also normal when the vehicle is traveling at very low speed. If the car stops knocking from low RPM to normal RPM, there is probably no malfunction.

Causes of Engine Knocking Sound

Why does a knocking sound occur in the engine?; Under normal combustion conditions, the fuel-air mixture ignites in the spark plug area and the flame propagates into the combustion chamber at an average speed of about 20 m/s, like the surface of a sphere. Meanwhile, the temperature and pressure of the gases increase, causing pressure waves to spread in the combustion chamber. Of course, the temperature and pressure of the still unburned mixture continue to rise at the same time. If the temperature in the unburned zone is higher than the ignition temperature of the fuel, spontaneous combustion will occur in this zone and new pressure waves will emerge, and the effect of these pressure waves will cause a knock. will create the sound. Thus, the main causes of engine crash of the vehicle can be listed.

It is almost impossible for the driver to self-diagnose what kind of problem is with the vehicle. Most importantly, when such knocking noises occur, the correct diagnosis is made and the vehicle is dealt with accordingly. When you go to a service shop or engine knock specialist, be sure to tell them exactly when this type of noise is coming from your vehicle. For example; These sounds are heard when the vehicle is changing, there are these sounds while driving and in motion, etc. If it is to be said in detail, the repair of the vehicle will also be correct and on point. Many other sounds that are considered as engine knocking can be perceived as engine knocking. The most common mistake is to confuse knocking noise with noise caused by loose connections in and around the engine.

How to Avoid Knocking Noise

What causes a knocking sound in the engine? After answering the question , let's explain how to prevent the knocking sound. If the knocking occurs while the engine is running, corrective action should be taken immediately to prevent serious damage. 2. If the engine is to be designed by a developer, any manufacturing equipment should be used to prevent knocking. 3. The fuel producer should produce fuel with high knock resistance. Let's analyze the first situation. If the knock occurs during acceleration or at high speed, the engine is overloaded in either case. Acceleration occurs at full throttle and at low engine speed. In this case, lowering the gear one step may help. In this way, when the power remains constant, the engine speed increases and the torque decreases. In this case, when the throttle is closed a little more, the cylinder filling will decrease, the compression pressure will decrease a little and the knock will disappear.

A high speed knock may occur at high vehicle speeds. Clicking is not easy at high speeds. For this reason, mutual combustion is rare as the necessary precautions cannot be taken. A knocking sound is heard when reducing speed. Knocking can be eliminated if super petrol is used in the crashing engine when using regular petrol. Knocking can also be avoided by slightly reducing the ignition acceleration. Since the pressure in the cylinder will decrease slightly, the acceleration will decrease, thus reducing the possibility of self-ignition of the filler. However, in this case, engine power will decrease slightly and fuel consumption will increase.

What is Engine Knock Sensor?

< p>These are sensors that can be used to detect and adjust engine knock vibration for diesel engine knock or gasoline engine. You ask; It detects possible knocking, vibration or other sounds in the vehicle engine and informs the on-board electronic control unit. The engine control unit controls the basic functions of the engine such as fuel injection and ignition and adjusts the fuel and ignition settings according to the signals sent. The electronic control unit adjusts the fuel injection and ignition advance of the vehicle's engine to eliminate hitting a standard value according to the strength and size of the knock. This sensor is needed to prevent or correct a knocking noise from the engine.

What are the Symptoms of an Engine Knocking?

 Engine traction power decreases, your engine has difficulties when it first starts, engine speed is constantly moved at idle speed, when you stop at a red light, the engine will not stop even if you press the clutch. Your yellow engine warning light will continue to flash. If you encounter such a failure, it is recommended to first follow the so-called diagnostic technique. If your vehicle runs on LPG, please avoid the above items and check if it suits you. This problem is usually caused by the LPG system. These problems can usually only be resolved by adjusting the airflow settings.

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