How To Stop Engine Knocking In 6 Simple Ways – Flawless Car Guide

how to stop engine knocking

An engine knock is one of the most prevalent issues that many car owners have to deal with at some time. However, in rare situations, it may be a serious problem that if ignored for an extended duration will cause irreparable damage to the engine.

It’s never pleasant to hear an engine knocking, but it’s even worse when it’s coming from your own car. If you hear a knocking noise coming from your engine, it’s most often due to uneven combustion of the fuel/air combination in the cylinders, but it can also be caused by worn-out parts. Too early ignition can occur if a portion of the air/fuel combination is ignited prematurely. Knocking noise and engine damage will result from these issues.

Engine knocking can be damaging to the engine and reduce its lifespan in extreme circumstances. It doesn’t matter how tiny or big an engine problem is, you should solve it as quickly as possible, regardless of the severity.

And while you may need to take your vehicle to a mechanic for a professional engine inspection and repair in some cases, it is still possible to block an engine knock on your own in most cases. This article aims to teach you how to stop engine knocking, what causes engine knocking, and the list of the best oil additive for engine knocking. So, let’s get started:

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how to stop engine knocking

What Does Engine Knocking Mean?

Your car’s engine makes a lot of noise when it’s running, and you may have heard it described as knocking. But what does that mean?

An internal combustion engine works by burning fuel in a small chamber called a combustion chamber. The force of the explosion created by the fuel pushing against the piston is what makes the car move. 

It is possible to experience knocking when the air/fuel combination in the combustion chamber is excessively lean. When the engine is started before the piston reaches the top dead center, it runs poorly and loses its smooth spinning.

A knock or ping, as well as a slight delay, are all signs that a piston has misfired, putting pressure on the crankshaft in the opposite direction of what should be. This can lead to engine damage and a decrease in power. The reason for this is that if you hear a noise coming from the engine, you need to stop it immediately.

Don’t worry, later in this article we have written several ways using which you can stop engine knock, but before getting right into it, let’s have a look at the engine knocking causes.

What Causes Engine Knock?

Several factors can cause the air/fuel mixture to detonate prematurely. A few of these engine knocking causes include:

  • Lower Fuel Octane Rating
  • Engine Overheating
  • Bad Timing
  • Faulty Spark Plug
  • Carbon Buildup
  • Bad Crank and Bearing

Let’s get a detailed perspective of each of the mentioned engine knocking causes:

how to stop engine knocking

Lower Fuel Octane Rating:

In the early days of the automobile, gasoline was a single-grade fuel. However, as engine design progressed and higher compression ratios were employed, knock became more prevalent. To combat this problem, octane ratings were introduced.

One of the most common issues that causes engine knock is using fuel with a lower octane rating than your engine is designed to use. That’s because a higher octane rating means the fuel is more resistant to detonation.

This problem is more common in high-performance engines, but it can also happen in standard engines if the octane rating of the fuel is too low.

You may be thinking of using a higher octane level fuel in your car. Think about it once again, as you may end up doing more harm than good because the engine may run rich and develop other issues as a result.

Using gas with the correct octane level for your vehicle is the best approach to prevent engine knock. If you don’t know what kind of fuel your car requires, consult your owner’s manual.

Engine Overheating:

One of the most common reasons for engine knocking is an overheated engine, which can result in engine damage. Fuel and air mixtures can spontaneously ignite in high-temperature cylinders.

This results in a knocking noise, and it can also reduce the vehicle’s efficiency and performance. Keeping your vehicle well-maintained, driving cautiously, and using a premium coolant are all ways to avoid your engine from overheating.

If your car does overheat, be sure to pull over to a safe location and call a tow truck. Or you can turn off the engine and wait for a few minutes to give time to cool down and then continue your journey. 

Bad Timing:

Among other engine knocking causes one of the most common is bad timing. When the valves open and close at the wrong time, it can create a knocking noise. Or when the spark plugs fire too early or too late, they can cause the air-fuel mixture to ignite prematurely.

This can create a shock wave that causes the fuel to knock against the sides of the cylinders hence leading to engine knocking. 

Keep in mind: There are 3 major categories of engine knocking, and each will have a different reason, so it is important to understand how to distinguish between the three. Preignition, detonation, and spark knock are the three different types of engine knock you can hear in a car.

how to stop engine knocking

Faulty Spark Plugs:

In the same way that other components are vulnerable to wear and strain and corrosion over time, so are spark plugs. If they aren’t performing properly, they might generate an engine knock. The engine’s air-fuel combination can ignite prematurely if the spark plugs aren’t performing properly.

This results in a knocking noise when the air and fuel mixture crash against the cylinder walls. This can lead to engine failure if left unchecked and should be addressed immediately.

Engine knock is easier and less expensive to fix the earlier you address it. When an engine knocks, it’s crucial to rule out other possible culprits like bad spark plugs before tackling a cure.

Carbon Buildup:

Carbon buildup is the leading cause of engine knocking.

The fuel-burning process in the engine produces a lot of carbon. Over time, carbon deposits accumulate on the piston heads and in the engine’s cylinders. These deposits create a “knocking” noise when the pistons are forced to move up and down. The noise becomes more pronounced as the engine ages and more carbon accumulates.

These deposits can cause all sorts of problems for the engine, including engine knocking, decreased performance, and increased emissions. 

Oil and filter changes and the use of a quality air filter that prevents engine knock can all assist to reduce carbon buildup. In most cases, carbon buildup can be cleared up with a simple tune-up or cleaning procedure.

Replace Crank and Bearing:

Last but not least on the list of what causes engine knock is a bad crank or bearing. When these components start to wear down, they can create excessive friction and heat. This can lead to a knocking noise that can be quite loud and annoying. In some cases, it may even be severe enough to cause damage to the engine.

As soon as you notice a noise coming from your engine, get it checked out by a mechanic immediately. It’s possible that something can be done to stop the problem from getting worse. A new crankshaft or bearing may be required to get the engine back to where it was before.

These were the 6 most common engine knocking causes that you need to be aware of. Let’s learn how to fix engine knocking

how to stop engine knocking

How To Stop Engine Knocking?

There are many ways to stop engine knocking, a problem that can be caused by several factors, such as low octane fuel, carbon buildup, or more. A few ways how to fix engine knocking are as follows:

Increase Fuel Octane Levels:

Engine knocking may be prevented with a few simple fixes. Increasing the octane rating of your fuel is one method of accomplishing this. Fuels with a higher octane rating have a lower knock rate, making them an excellent choice for high-powered engines. Fuel in the engine will be less likely to ignite prematurely as a result of this.

You can usually find out what octane level your car needs by checking the owner’s manual or consulting with a mechanic. An octane booster can also be used occasionally in your car. Make sure your car is getting enough octane levels by doing this.

Clean Combustion Chamber:

When an engine runs, the air-fuel mixture inside the combustion chamber is compressed. If the air-fuel mixture is too lean or too rich, it can cause knocking. Cleaning the combustion chamber can help to stop engine knocking.

One way to clean the combustion chamber is to use a fuel additive. Using the best oil additive for engine knock helps keep the fuel-air mixture in the correct ratio and prevents knocking. Another way to clean the combustion chamber is to use a cleaning spray. A cleaner spray helps remove carbon deposits from the combustion chamber.

Make certain that the combustion chamber is free of any carbon buildup. A hotspot can form and cause engine knocking if the deposits have any gaps. Apply a layer of motor oil to the surface after cleaning the combustion chamber to prevent further corrosion.

how to stop engine knocking

Replace Spark Plugs:

Spark plug replacement is a popular remedy for engine knocking. Having outdated or corroded plugs might lead to an engine that makes a noise. It is possible to fix this problem by changing the plugs to restore the engine to its original state.

Replace the spark plugs is a simple task that can be performed by anybody with a basic understanding of vehicles. A socket wrench and a screwdriver are all you’ll need to replace your spark plugs.

Remove the engine’s cover first. After that, remove the old spark plugs with a socket wrench and replace them with the new ones. Insert the new spark plugs and use the socket wrench to tighten them. The final step is to replace the engine cover and fire it back up.

According to experts, you must replace them after the car has traveled 30,000 miles on them. Even if it has not yet become started to wear out, you should replace it to avoid knocking. Keep in mind that you must use the proper size and type of spark plug when replacing your old one. If you choose the incorrect one, you won’t succeed to stop engine knock.

There are many different types of spark plugs available, so it’s important to do your research before purchasing one. If you’re not sure which type of spark plug to buy, consult your vehicle’s owner’s manual or speak with a trusted mechanic. Replacing the spark plug can help reduce engine knocking and improve your vehicle’s performance.

how to stop engine knocking

Tune the Timing:

Although engine knocking is a typical problem with gasoline engines, changing the timing can help prevent or decrease it. An engine’s knocking noise is caused by fuel igniting prematurely in the cylinders when it is operating too quickly.

You can adjust the timing by turning the distributor or using a timing light. If your car has electronic ignition, you can also adjust the timing using a computer.

In order to avoid future engine knocks, you’ll need to keep your car’s timing in check. Furthermore, while hiring a professional is the ideal solution, you can accomplish the task on your own if you so choose.

You can find all the information you need about timing changes in your owner’s manual. If you have a few spare minutes on Saturday afternoon and a few basic tools, this should be a fairly straightforward chore. The knock should be avoided once the time has been fixed.

Check Engine Temperature:

A knocking engine is attempting to communicate with you. If you’ve done everything listed above and are still hearing an engine knock, all it takes to stop it is to keep an eye on the temperature of the engine.

Overheated engines begin to knock as a warning sign that further damage is imminent. When it starts to get too hot, pull over and let it cool down before continuing on your journey. 

Check to see that the electric fan is functioning properly and that it turns on to cool the engine when it is assumed to do so. Make sure that the temperature gauge is working properly so that you know when your engine is becoming too hot. The fan wiring should also be checked for any problems.

Also, make sure the engine cooling system is functioning properly because it is critical in maintaining the correct engine temperature. The cooling system should not only be functionally efficient but should also be properly stocked with coolant.

You can also try adjusting your driving habits – for instance, slowing down when you approach a hill or increasing your speed gradually rather than accelerating quickly.

how to stop engine knocking

Replace Crank and Bearing:

If you notice that your engine knocks when you accelerate. This is often caused by a worn crank or bearing. Replacing these components can stop the knocking and keep your car running smoothly.

The first step is to remove the engine cover. Next, remove the spark plugs so that the engine can turn more easily. Now, use a ratchet to loosen the bolts holding the crank in place. Be careful not to damage the threads. Remove the old crank and replace it with a new one.

Next, remove the bearing caps and bearings. Replace any damaged bearings and reattach the caps. Apply a small amount of lubricant to the new bearings before reassembling everything. Reinstall everything in reverse order and you’re done!

Although you can perform these steps yourself, however, it is strongly recommended to seek help from a professional as being a beginner you may end up creating a new mess.

how to stop engine knocking

Why You Should Use Best Oil Additive For Engine Knock:

Oil additives come equipped with numerous benefits, to mention, a few of them are as follows:

  1. A better oil additive means more power for your engine. You’ll be able to tell that your engine has enough power the moment you start it up using the proper product.
  2. Oil additives are environmentally friendly because they do not release pollutants into the atmosphere. The oil additives are also safer than regular gasoline, which is why they are used in many vehicles. It will minimize your car’s carbon emissions and make it more environmentally friendly. Oil additives are a quick and effective way to minimize carbon emissions’ negative impacts.
  3. There is no doubt that oil additives can protect your car engine. Additives can help reduce sludge build-up, clean the oil and prevent gumming up of the engine. In addition, additives can also protect the piston rings and other moving parts against wear by properly lubricating them.
  4. Oil additives are economically ideal options for a number of reasons. They are typically inexpensive to produce and use, they have low toxicity levels, and they can be stored for long periods of time without adverse effects. Additionally, they prevent possible future damages that can be costly to repair.
  5. The use of oil additives has been around for many years and there is evidence that they can improve car performance. The ingredients used in them tend to improve the efficiency of the engine, which in turn results in improved fuel economy.

9 Best Product For Engine Knocking You Can Buy:

The following are the most effective oil additives to stop engine knock, particularly in older engines:

Sea Foam SF16:

The SF16 additive is a new product on the market that is supposed to stop engine knocking. It is made of environmentally friendly ingredients and does not contain any harmful chemicals making its way among the best product for engine knocking.

The company that makes it, Sea Foam, SF16 is a petroleum-based additive that “lubricates and cleans the entire fuel system,” which helps to prevent knocking and improve performance. 

Because Sea Foam removes impurities, gum, and topcoat deposits, it is a considerable benefit to use it. Sea Foam additive can significantly enhance the engine’s power if the engine has more than 200,000 miles on it. The engine’s banging will be significantly reduced as a result.

Lucas Heavy Duty Oil Stabilizer:

Lucas Heavy Duty Oil Stabilizer should be used for at least two years before it needs to be replaced. Your current oil will last longer, lowering the number of times you’ll need to replace it.

Lucas Heavy Duty Oil Stabilizer reduces the amount of oil that needs to be used by a significant amount. As a result, your engine’s overall performance will be enhanced. When you install this kit, you’ll get more miles per gallon and almost no dry starts or knocking sounds.

It is among the best oil additive for engine knock you can buy.

Red Line Break-In Oil:

There is enough Red Line Break-In Oil additive for two regular maintenances, depending on how much you put in. Your pistons’ rings will be able to get into the correct position more quickly since the oil is less slick.

When you press the start button, the engine will start up with fewer noises and chatter. The supplement contains phosphorus and zinc, two of the most significant components.

Liqui Moly Cera Tec Friction Modifier:

A wide range of industrial engine oils can be used with the Liqui Moly Cera Tec Friction Modifier. If your oil is compatible with this additive — which is rare — you can use almost any oil you choose. Liqui Moly is a great oil additive for long-distance travelers looking to boost their vehicle’s performance.

Regardless of how cold or hot it gets, it still works well. Most importantly, the filtration system will be less likely to accumulate deposits as a result of this. Your engine’s volume will be reduced as well if you have one.

This best product for engine knocking is undoubtedly a treat for your car engine.

Archoil AR9100:

An excellent oil additive, Archoil AR9100 is highly recommended for diesel engines. A substantial decrease in the symptoms of friction, vibration, and other engine noises will be noticed when you use this additive in your vehicle.

For gasoline-powered engines, the same holds true. Archoil AR9100 can not only minimize engine noise, but can also improve hydraulic, transmission, and power steering performance.

Lucas Engine Oil Stop Leak:

Your engine’s oil consumption will be reduced by a smaller amount thanks to the Lucas Engine Oil Stop Leak. The car’s overall performance will be improved as a result of the increased oil pressure.

Getting the desired outcomes is as simple as swapping out one quart of stop leak oil for one quart of motor oil during your next scheduled maintenance appointment. It doesn’t matter if the oil is conventional, synthetic, or a hybrid of the three; this addition will work perfectly.

Rev X Fix Oil Treatment:

If your vehicle’s fuel injectors are frequently blocked with grit and other debris, TRev X Fix Oil Treatment can help.

Regardless of whether you have a petrol or diesel engine, applying this premium oil additive will increase its performance. Additionally, this additive has no corrosive components, making it one of the best oil additives for engine knock you can buy.

BG MOA Oil Supplement:

The BG MOA Oil Supplement is an oil additive that would improve your acceleration performance while simultaneously decreasing your RPM. According to several users, the advantages of the oil additive continue to be beneficial even after you have driven 5,000 miles and had your oil changed.

Because the additive will aid to make the engine more resistant to corrosion, there will be lesser knocking noises produced. Making it one of the best oil additive for engine knock you can buy.

BestLine Premium Synthetic Engine Treatment:

As a result, BestLine Premium Synthetic Engine Treatment reduces engine friction and wear and tear. Because of this, you’ll be able to get more out of your vehicle in terms of performance and fuel efficiency.

After starting the engines for the first time, you should notice a decrease in any strange vibrations or noises.

how to stop engine knocking


Engine knock is a typical issue that many drivers deal with on a regular basis. If you hear a knocking noise, it may be a sign that your engine has problems that need to be addressed.

First, discover the source of engine knocking, which can range from using low-octane fuel to damaged spark plugs to a dirty combustion chamber, among other things, before taking any more action.

The problem should be rather easy to fix once you know what’s causing it. In order to avoid engine knock, you should use a higher octane fuel or an octane booster, switch out your spark plugs, and thoroughly clean the combustion chamber in your car.

Having said that, taking your vehicle to a skilled mechanic will be the simplest and, in many cases, the most effective approach to deal with an engine knock. However, you can use the best product for engine knocking to tackle the issue.