Engine knocking refers to the metallic sound an engine can produce when pressure is applied to the gas pedal. The noise may be a hollow knocking sound or more of a rattling sound—in either case, it's not a sound you want to hear

By that definition we want to use the avenue to dispel the statement by local mechanics that a knocked engine means a spoilt engine.

Various types of engine knocking causes are there, and the sounds of knocking differ from each other based on the source of the cause. Engine knock detection is necessary for solving the engine knock problems,you can address the problem by detecting the root of the noise.

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The three most common causes of engine knock are:


Using Low-Quality Fuel

A great number of the filling stations in the country sell Sub-par gasoline and this can increase the cylinder pressure and chamber temperature. we don't want to get too technical but the octane rating of fuel represents the level of compression it can tolerate. A fuel with a higher rating can resist the combustion better.

So, using low-quality gasoline in the engine causes engine knock by being burnt earlier than it should (burning fast). Low engine compression causes the fuel to burn incompletely. As a result, remaining fuel components and compounds create debris that sticks to the inside of the chamber. This buildup causes engine knock in the cylinder, however purchasing quality fuel treatment and using it every time you buy fuel can help counter this issue.


Debris Formation on the Cylinder Walls

As mentioned earlier using sub-par gasoline creates debris in the engine cylinder. Once the debris starts to build, they don’t stop.

The engine needs to mix up air and fuel to function normally. But, the debris formation takes up valuable engine space, creating an obstruction for the engine to work properly. The bigger the debris deposit, the higher the compression will be in the cylinder; which will eventually cause knocking if the compression is not on a par with the engine’s temperature ranges or the quality of the fuel.

Using Wrong Spark Plugs

The experts identify it as one of the most common engines knocking causes. Spark plugs help to control the internal environment of an engine. As they function under precise conditions, you have to use the ones exactly what the manufacturer has recommended.

Many people often buy the wrong ones for they either misread the user manual or try to save on a cheaper alternative. So, using the wrong plugs will cause debris formation in the combustion chamber and improper engine temperature. These two conditions, as we already know, are the two leading causes of engine knock.

Other engine knocking causes are also related to these three primary reasons for engine knocking problems for example

- High engine temperature (over heating),
- Worn rings and valve seals,
- Bad knock sensor,
- Greasy injectors,
- Defective main crankshaft bearings
- A cracked or broken flywheel or flex-plate that attaches the engine to the transmission
- A worn water pump bearing
- A failed or loose timing belt tensioner can knock when the timing belt slaps against it
- An air conditioning compressor can knock when it is failing or icing up
- An alternator with worn rotor bearings can knock when the pistons fire


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Remember that you have to find out the root source of the problem to solve it correctly.