Engine Knock is a very disturbing problem of the car, no one always likes to hear annoying noises from the engine. The engine knocking problem occurs when the air-fuel ratio inside the cylinder is reversed. If the air-fuel ratio is not right, the cylinder will not burn evenly, this is the main reason for engine knocking. If the fuel is not burned properly, a shock wave can come which will damage the cylinder wall and piston. So it is very important to burn fuel properly. Let's see what causes the engine to knock.
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Each manufacturer gives a fixed octane rating for their car, which means the car will run best on that octane of that rating. Toyota seems to have recommended 89, but Bangladesh's octane value is so bad that Egular's rating drops to 78-80. So this is also a reason to knock the engine, if you take octane from a good fuel station, hopefully, the problem will be solved a bit. Or you can use "Octane Booster" with normal octane if you don't get high-rated octane; Which will increase your octane rating. Even if more carbon is accumulated in the cylinder wall, the engine can be knocked out. Before selling octane in pumps abroad, the government officially mixes carbon cleaning agents with octane, I don't know if it is added in our country. Whether you add it or not, you can mix a carbon cleaning agent with the fuel which will clean the carbon stored inside the cylinder. Liqui Moly seems to have such a product in our country.
The wrong spark plug in the car can also cause problems like engine knocking because the spark plug e does the job of burning. Each manufacturer offers a spark plug recommendation for their car, along with some alternatives. Make sure you are using the correct plug. If your engine oil gets too old; Due to which the engine is not lubricated properly, then the sound like engine knocking can come from metal to metal friction. So changing the engine oil can be a solution.
Engine knocking is very annoying, you can follow the above methods whenever you see abnormal noise coming from the engine. Hopefully, I'll give it a go.