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Engine Knocking When Accelerating

Engine Knocking When Accelerating: Causes & Fix

It is entirely normal for the car to make a noise when operating. Because some of the moving parts collide with other elements, creating a sound can also be air moving inside the system.

However, there are still some sounds that signal an abnormality of the vehicle or ongoing damage that we do not know. One of the most typical examples is the engine knocking when accelerating.

Distinguish The Sounds That The Engine Emits

As mentioned above, there are many different types of sounds that the car can emit when operating in general and when accelerating in particular.

However, if you start to change the car speed and you hear a fast ping or the sound of metal slamming together, there is likely an engine problem.

If you have previous experience, listening to strange sounds coming from the engine when accelerating will also help you somewhat guess where the problem originates.

In which some typical noises for errors like Rod knock are signs of worn bearings or faulty sensors while Detonation knock comes from fuel problems, …

Cause Of Engine Knocking When Accelerating

Engine Knocking When Accelerating

Even with simple noises, there may be errors or serious problems behind this anomaly. Below are some common causes of engine sound when accelerating.

# Low Octane

Too low an octane is one of the most common causes of annoying engine noise when accelerating.

Usually, each type of fuel will have a different octane rating that represents the resistance of gasoline or oil to the increase in pressure during the combustion cycle.

If the octane number is too low, there is a high chance that the gas and fuel mixture will explode before reaching maximum stroke. And the result of this process is strange noises.

# Bad timing

To ignite the fuel in the tank, the vehicle needs an ignition system to generate a spark strong enough for combustion to occur.

However, if the details for the ignition work at the wrong time, the sparks will be emitted with a rather loud sound. And that’s the sound you hear from the engine.

# Lean Air/fuel Mixture

The engine does not directly use fuel to activate the combustion process but must be mixed with air to create a mixture with good ignitability and combustion.

So if the engine is not combined well enough with the right components due to a faulty sensor, injector, or any other part, the explosion of the mixture will certainly no longer be stable.

In cases where the gas and fuel do not mix perfectly, the flashpoint will no longer be accurate and tends to be later or earlier. And the explosion is the cause of the noise.

# Faulty Spark Plugs

Spark Plugs are one of the essential parts of igniting the fuel mixture and starting the vehicle through sparking. So if something goes wrong with this part, there’s a good chance the sparking ability will no longer work as designed.

That is why during acceleration, Spark Plugs can automatically operate even without fuel inside. The result of this misoperation is a loud noise.

# Carbon Deposits

During the operation of the engine, the accumulation of carbon is very difficult to avoid. Often we will use some additive to treat stubborn carbon stains in pipes and cylinders.

However, if for some reason these agents accumulate excessively, the space inside the engine is compressed. The consequence of this phenomenon is that the fire will occur at the wrong time and cause noise.

# Low Oil Level

The primary use of machine oil is to help parts work more smoothly and reduce friction between parts when in contact with each other. If the lubricating oil is not enough to perform the above tasks, the process of the elements colliding with each other will certainly create an unpleasant noise.

How To Deal With Annoying Engine Knocking Sound when Accelerating

Engine Knocking Sound when Accelerating

If you are not a person who possesses the full range of skills and experience in auto repair, it is best to take your vehicle to a shop to have a look. And if you’re still confident in your abilities, here are a few ways to handle the noise yourself.

# With all kinds of solutions

In cases where fluids such as engine oil and carbon treatment agents are the cause, replace them with new products.

If the fuel you are currently using does not have enough octane rating, you may want to consider switching to a new fuel.

# Sensor error

Although the components are tiny, electronic devices such as sensors or fuel injector control chips appear a lot and play a vital role in the vehicle’s operation.

Also, because of the above characteristics, we will have to use specialized scanners that can help you identify errors in those locations. You also need to consult more information from the manufacturer to compare and find the difference that causes errors.

# Error in other details

You should first check the spark plug because this is the part most at risk of damage when a noise occurs during acceleration. To be sure, we can replace a new product for more peace of mind.

With the rest of the parts, it’s best to consult the manufacturer’s instructions before meddling further in.

Can We Drive When There Is An Engine Knocking?

Of course, you can drive a car that emits engine noise as long as the damage has not reached the level of affecting other components or, worse, stopping the car completely. However, you still need to pay attention and check for damage as soon as possible to ensure safety.

Cost Of Repairing Noise-Related Problems

It will not cost too much to deal with the noise coming from the engine when accelerating. Mostly you will only have to replace the spark plugs and the electronics and assistive solvents, and the cost to fix these issues is in the range of $200 or less.

However, if the problems have spread to other parts or are rooted in deep engine details like an oil leak, then perhaps the repair cost will increase.


There are many different causes of Engine knocking when hastened. So hope that today’s article has helped you identify and take measures to handle and prevent this unpleasant incident.

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