How To Stop Engine Knocking (Meaning, Causes, and 9 Best Additives) Flawless Car Guide

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how to stop engine knocking

Any car enthusiast will tell you that engine knocking, also known as pinging or detonation, is extremely annoying and may lead to major damage and expensive repairs if left unchecked.

Knowing how to recognize this problem and what to do about it before it becomes worse is crucial. Let’s take a look at what engine knocking is, why it happens, and how to stop engine knocking so you can keep enjoying those quiet, comfortable rides for miles to come!

Let’s get started:

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how to stop engine knocking

What Does Engine Knocking Mean?

Engine knocking is a sound that you should be listening to when driving your car. It’s a striking, metallic sound that comes from the engine, commonly while accelerating quickly. Engine knocking happens when there is premature combustion happening or the air-fuel mixture inside your vehicle’s cylinders is not burning properly.

Engine knocking can cause significant wear and tear on your vehicle’s engine, ultimately leading to expensive repairs; Not only can this cause damage, but it also impacts fuel efficiency, meaning you could be paying more than necessary at the pump.

If you notice any signs of engine knocking, take the time to identify and address them since it’s best to catch this problem quickly before they become more extreme.

What Causes Engine Knock?

Several factors can cause the air/fuel mixture to detonate prematurely. A few of this 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:

Engine knocking is a very common issue for cars and is often caused by using low-octane fuel. Engine knock occurs when engine components are subjected to too much stress due to the increased pressure from burning an incorrect fuel grade.

It’s important to know what octane rating your vehicle requires in order to avoid it happening. Keeping your car’s engine running well is key, so be sure not to use the wrong fuel type so that you can have sustained high performance and longevity.

If you are experiencing engine knocking, make sure that you take your car in for service as soon as possible and replace the old gasoline with fresh gasoline with a correct octane rating.

Engine Overheating:

Overheating is a common contributor to engine knock, especially when driving for long distances or at high speeds. Some of the gasoline in the combustion chamber ignites prematurely when an engine gets heated, producing a knocking noise.

To avoid this, keep a constant eye on your engine’s temperature and take care of any problems as soon as you notice them.

Keeping your vehicle well-maintained, driving cautiously, and using a premium coolant are all ways to avoid your engine from overheating.

Bad Timing:

Engine knock is usually caused by bad engine timing, when the valves are either opening too early or closing late, or when the spark plug fire too early or too late. This causes an air-fuel mixture to ignite when it should not, resulting in the engine knock sound.

To prevent this from happening, be sure to check your engine timing belt and spark plug regularly to ensure they are functioning properly. Regular maintenance and repairs may help stop troublesome engine knocks before they start.

how to stop engine knocking

Faulty Spark Plugs:

Engine knocking is a common problem that can quickly compromise the performance of your vehicle’s engine. Faulty spark plugs are one of the primary causes of engine knocking, which occurs when the air-fuel mixture within the combustion chamber is ignited prematurely by sparks from the bad spark plug.

This can lead to decreased power and efficiency as well as excessive fuel consumption and even damage to all the cylinders if left unresolved. Fortunately, replacing faulty plugs is a manageable repair that can stop engine knock and ensure smooth operation for years to come.

Carbon Build-up:

Carbon build-up is one of the main causes of engine knocking.

A large amount of carbon is released throughout the engine’s fuel-burning operation. This causes carbon to accumulate on the piston heads. When the pistons move up and down, the deposits make a “knocking” sound. The noise becomes more visible as more and more carbon accumulates over time.

The engine may experience knocking, lower performance, and elevated emissions due to the presence of these deposits.

Reducing carbon build-up on the cylinder head can be aided by regular filter and oil changes, as well as by using a high-quality air filter that prevents engine knock. A simple tune-up or cleaning process usually does the trick for clearing off carbon buildup.

Replace Crank and Bearing:

A faulty crank or bearing is the last possible cause of an engine knock. When these parts begin to wear, they might cause too much friction and heat to build up. This can cause a knocking noise that is both loud and irritating. Sometimes it might be so bad that it actually damages the engine.

If you hear a strange sound coming from your engine, you should have it looked out right away. At least some action may be taken to prevent the situation from worsening. The engine may need a new crankshaft or bearing to function normally again.

You should be aware of these six most typical reasons for knocking the engine. Let’s learn how to fix engine knocking.

how to stop engine knocking

How To Stop Engine Knocking?

The knocking engine can be caused by a number of issues, including low-octane gasoline, carbon deposits/buildup, and others, but there are various solutions to the problem. Here are a few solutions on how to fix engine knocking are as follows:

Increase Fuel Octane Levels:

There could be a few easy fixes that would keep the engine from knocking. One way to achieve this is to boost the octane level of your fuel. To get the most out of your high-performance engine, you should use fuel with a high octane rating because it has a lower knock rate.

Fuel in the engine will be less likely to ignite prematurely as a result of this.

Your vehicle’s recommended octane level should be listed in the owner’s manual or provided by your mechanic. It’s okay to sometimes supplement your gas with an octane booster. Doing so will guarantee adequate octane levels for your vehicle.

Clean Combustion Chamber:

Engine operation relies on combustion chamber air-fuel compression. Lean or rich air-fuel mixtures cause knocking. Cleaning the engine’s combustion chamber reduces or eliminates knocking.

Fuel additives can clean combustion chambers. If you apply the best oil additive for engine knock, you can keep the fuel-air mixture at the right level and avoid knocking.

Cleaning the combustion chamber with a spray is another method. A cleaning spray can remove combustion area carbon deposits.

Check and remove carbon deposits/buildup in the combustion chamber. Hotspots might damage the engine if the deposits are not solid. Oil from the engine should be applied to the combustion chamber to prevent corrosion after cleaning.

Replace Spark Plugs:

how to stop engine knocking

Engines that bang often requires spark plug replacement. Spark plugs can make engine noise when they age or corrode. Plug replacement fixes the issue and restores engine performance.

Anyone with basic mechanical skills can change their car’s spark plugs. With a socket wrench and screwdriver, the spark plug can be changed.

Uncover the car engine first. Remove the old spark plugs with a socket wrench. Change spark plugs and tighten socket wrench. Finally, replace the engine cover and start it.

After 30,000 kilometers, experts advise replacing them. To avoid knocking, replace it even if it’s still good. Replace old spark plugs with ones of the same size and style.

It’s smart to research spark plugs before buying because there are many options. If you need help choosing plugs for your car, see the manual.

Tune the Timing:

how to stop engine knocking

Engines that run on gasoline often knock, but timing can decrease or eliminate it. A knocking noise occurs when an engine’s RPM is too high and gasoline ignites prematurely in one or more cylinders.

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

Controlling your car’s timing will prevent car engine bangs. The best option is to hire a professional, although you can do it yourself if you choose.

The owner’s guide will explain how to change timing. If you have some basic tools and a Saturday hour, this should be easy. Don’t knock after the time’s set.

Check Engine Temperature:

A knocking engine sound is telling you something. If you’ve tried everything and still hear an engine knock, check the engine’s temperature.

Engines that have become overheated will start to knock as a signal that more harm is about to occur. Stop if the temperature rises dangerously.

Check that the electric fan cools the engine appropriately. Check the temperature gauge to avoid engine rebuild. Make sure the fan’s wiring is fine also.

Keep the engine cool by maintaining the engine cooling system. The cooling system must work well and have enough coolant.

Replace Crank and Bearing:

how to stop engine knocking

A worn crank or bearing causes a knocking engine when you hit the gas pedal. Replace these pieces to keep your car running smoothly and avoid knocking.

Remove the engine cover. Pulling the spark plugs frees the engine. Unbolt the crank bolts with a ratchet. Be gentle to preserve threads. Replace the worn handle.

Remove the bearings and covers. Replace bearings and reinstall covers. Lubricate the new bearings before reassembling the machine. Reinstall everything in reverse order to finish.

You can accomplish these things on your own, but if you’re starting off, get some expert help to avoid making things worse.

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. Good oil additive boost engine power. Start your engine with the right stuff and you’ll know it has enough power.
  2. Oil additives don’t pollute. Oil additives are safer than gasoline, thus many vehicles utilize them. It reduces your car’s carbon footprint. Oil additives are a fast and effective technique to reduce carbon emissions.
  3. Oil additives protect your car engine. Additives purify the oil, minimize sludge, and prevent engine gumming. Additives can help lubricate piston rings and other moving elements to prevent wear.
  4. Oil additives are cost-effective for many reasons. They’re cheap, safe, and long-lasting. They also prevent expensive future damage.
  5. Good oil additive has improved vehicle performance for years. Their ingredients boost engine efficiency and fuel economy.

Best Product For Engine Knocking (Best 9 Picks):

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

Sea Foam SF16:

The SF16 fuel additive is a recently released chemical designed to eliminate engine knock. Sea Foam additive is a 100 percent pure petroleum product that is EPA registered. It liquefies gum and varnish deposits or internal engine contaminants, which can lead to decreased performance and increased emissions.

If your engine has over 200,000 miles on it, adding Sea Foam to it can help it run like new again. The clatter of the engine should quiet down considerably.

Lucas Heavy Duty Oil Stabilizer:

If you’re looking for a product that can help you extend the life and your engine performance while also keeping it running smoothly, Lucas Oil 10131 Pure Synthetic Oil Stabilizer may be a good option to consider.

This product is designed to virtually eliminate dry starts and excessive wear, and it can also stabilize oil pressure and lower oil temperature. In addition, the Lucas Oil Stabilizer can help to eliminate hesitation, rough idle, stalling, and poor fuel economy.

It’s safe to use in any gasoline or diesel engine – and it also increases power and mileage. It is among the best oil additive for engine knock you can buy.

Red Line Break-In Oil:

Red Line 81403 Engine Break-In Oil is designed to help reduce wear on new engines by providing a coating of protective oil. It is also compatible with other oils of an engine, so you can use it as part of your regular maintenance routine.

This oil is formulated to withstand high temperatures and pressures, making it a great choice for racing or performance applications.

There is enough Red Line Break-In Oil additive for two regular maintenance, 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:

This product is mixable with all commercially available motor oils, and it helps to stabilize your engine even under high thermal and dynamic permanent loads. Plus, there’s no need to worry about deposits with this product – it’s completely compatible with all commonly used oil filters system.

Best of all, it resists extremely high and low temperatures, so you can rest assured that your engine will stay in great shape no matter what the weather throws at it.

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

Archoil AR9100:

Archoil AR9100 comes highly recommended as a fantastic oil additive for diesel engines. When you apply this additive in your car, you will notice a drastic improvement in the engine’s ability to run smoothly with significantly less friction, vibration, and noise.

This also applies to gasoline-fueled vehicles and vehicles. In addition to reducing engine noise, Archoil AR9100 boosts the efficiency of your vehicle’s hydraulics, gearbox, and power steering.

Lucas Engine Oil Stop Leak:

If you use a Lucas Oil Stop Leak, your engine will use less oil overall. If the oil pressure in your car is raised, you’ll notice an improvement in the vehicle’s overall performance and oil consumption.

For the desired results, just switch out one quart of motor oil for one quart of stop leak oil at the next maintenance visit. This additive is suitable for use with any oil, be it traditional, synthetic, or a mixture of the two.

Rev X Fix Oil Treatment:

Fuel injectors that are clogged with grit and other debris can be unclogged using TRev X Fix fuel injector cleaner.

This great oil additive improves the performance of both diesel and gasoline engines. Also, unlike some other oil additives for engine knock, this one contains no corrosive substances.

BG MOA Oil Supplement:

Adding the BG MOA Oil Supplement to your engine oil will help your acceleration performance while using fewer revolutions per minute (RPM). Several reviewers have found that the benefits of this great oil additive persist even after 5,000 miles of driving and an oil change.

The engine will make less knocking noise after using the additive, which helps make it more resistant to corrosion. 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.


Q: What Does It Mean When You Hear Knocking?

A: When an engine’s air-fuel mixture combusts, it makes a knocking sound. As the combustion chamber pressure and temperature rise fast, metal components vibrate, creating a shockwave. 

Spark plug spacing issues are a common cause of knocking. Always cover your car’s cylinders with spark plugs. Due to worn parts or faulty installation, incomplete combustion might cause knocking noises from your vehicle’s cylinder walls. Misfires reduce fuel economy!

If there is too much compression from carbon buildup on your piston head, high pressures in your cylinders can cause backfires and pre-ignition, which can cause knocking noises from your tailpipe/header pipes when accelerating or decelerating hard (elevated revs).

Incorrect fuel mixes can also produce valve clogging and knock sounds from the exhaust and intake manifold vacuum leaks/cracks.

It’s important not to ignore this issue as it may lead to expensive repairs down the line, so we recommend taking it to an experienced mechanic for inspection, who will likely start by inspecting all ignition components before moving on to likely causes like those mentioned above.

Supercharging problems can also cause similar symptoms, so check any performance upgrades you may have installed!

Q: Engine Knock After Seafoam?

A: Yes, it is possible to experience engine knock after using seafoam. Engine knock occurs when fuel and air prematurely ignite in the combustion chamber. This can be caused by a variety of factors, including low-octane fuel, worn spark plugs, or carbon build-up.

Seafoam is an aftermarket chemical additive used to clean out the carbon buildup in engines. It can help restore performance and reduce emissions, but it can’t remove knocking if it is caused by anything other than carbon deposits.

Q: Fuel Knock vs Rod Knock?

A: Rod knock and fuel knock are engine sounds. An improper air/fuel ratio or spark timing causes fuel knock. It sounds like a metallic tapping or pinging that rises with engine speed.

Rod knock is produced by worn engine connecting rod bearings. A loud knocking sound increases with engine speed and reduces when the throttle is withdrawn. Lack of lubrication or overloading bearings can cause premature connecting rod wear.

Fuel knock and rod knock can severely damage your engine if left unchecked. If you hear either noise, take your car to repair.

Q: Can a Bad Spark Plug Cause The Engine To Knock?

A: Yes, a faulty spark plug can cause an engine knock. Spark plugs ignite engine gasoline in the combustion chamber. Due to wear or dirt, it may not ignite properly, causing knocking noises.

Knocking noises may be accompanied by decreased power output and increased fuel usage. Spark plugs should be checked and replaced by a professional to diagnose this issue.

Q: How Much To Fix The Engine Knock?

A: Engine knock repair charges depend on the damage. A defective spark plug is a cheap remedy. If it’s a bigger problem, repairing it could be expensive.

To estimate engine knock repair costs, take your car to a competent mechanic. The mechanic will locate the noise and estimate repairs. They might also recommend replacing or repairing engine parts.

Repairing an engine knock is also laborious and time-consuming. This suggests that even if the parts are cheap, the repair may cost more than expected.

how to stop engine knocking
how to stop engine knocking


Common problems that motorists encounter frequently include engine knocks. A banging sound could indicate engine trouble that needs to be checked out.

Before taking any further action, it is necessary to identify the cause of the engine banging, which may be caused by anything from low-octane fuel to damaged spark plugs to a dirty combustion chamber.

Once the root cause of the problem is identified, a solution should be straightforward. It is possible to prevent engine knock by using fuel with a higher octane rating or an octane booster, replacing the spark plugs, and cleaning the engine’s combustion chamber.

However, the quickest and most reliable way to fix an engine knock is to take your car to a professional repair. But the problem can be fixed by using the best product for engine knocking.