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What Are the Common Engine Knocking Causes?

What Are the Common Engine Knocking Causes?
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The fuel in the engine burns in waves that are timed to the cycle of the engine. However, it causes explosions and interferes with the engine’s cycles when it is ignited improperly, causing knocking sound in the 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.

Three Common Engine Knocking Causes

Engine knock detection is necessary for solving the engine knock problems. Either it’s a deep throbbing sound or a little bang, you can address the problem by detecting the root of the noise.
Check out the three most common causes of engine knock:

causes of engine knock

Using Low-Quality Fuel

Sub-par gasoline can increase the cylinder pressure and chamber temperature. 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. 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.

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Debris Formation on the Cylinder Walls

We’ve already discussed that how 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.

engine knock detection

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. Engine knock can also occur for high engine temperature, worn rings and valve seals, bad knock sensor, greasy injectors, and more.

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

Tsukasa Azuma

Tsukasa Azuma is an awesome car blogger of Car From Japan. He owns a car repair shop at downtown Osaka, and he put all that experience to good use in her sharing posts. Tsukasa’s blog is one of the best resources for information about keeping your favorite imported car running smoothly. Moreover, because of being passionate to learn about the recent happenings in auto industry, he doesn’t only provide great car maintenance tips, he also always updates latest trends in among car brands and share them in his own interesting viewpoint.

8 thoughts on “What Are the Common Engine Knocking Causes?

  • February 17, 2017 at 1:51 am

    It’s possible motor vehcle economy fuel

    • February 28, 2017 at 1:19 pm

      Thank you for your comment. Find this article useful? Please share exciting updates with your friends and they will love it!

  • November 12, 2017 at 2:40 pm

    Thanx for that important information.
    My car has a problem with its timing chain making a funny noise as I’d it needs straightening but it at its maximum. I tried and replaced with anew one but the problem persisted. What could it be?

  • November 13, 2017 at 3:44 pm

    Thanks for the main tips for engine knock, my vehicle has a problem of hard start in morning hours but Diesel, heater plugs, rota head, fuel filters are all okay. How can you help me.

  • November 14, 2017 at 2:28 am

    This is very useful. My RAV 4 engine just knocked. Being forced to buy slim engine.

  • November 15, 2017 at 1:50 am

    Thanks for such important information. I will definitely adhere to the guidelines to protect my vehicle from engine knock.In addition, we need more such data on our vehicles’ specification.

  • November 15, 2017 at 11:05 pm

    Found it useful and very important to prolong engine life. Continue such posts


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