knocking sound in engine

The knocking sound in engine we often hear from a car is caused by the various moving components inside. You should pay close attention whenever you hear anything out of the usual. The gentle tap that varies in volume in response to your finger on the gas pedal may result from stuck valves or tappets. If you get a harder knocking sound with a loss in power, it’s likely that the ignition timing is incorrect. Sounds of rattling and then stronger knocking while starting the car might indicate a problem with the ignition timing. It will need extra time to fix the rattling noise that looks to be coming from beneath the engine. Most drivers lack the expertise to identify or differentiate between banging from the crankshaft, detonation, or piston rings. The best customer service teams are always willing to provide some help.

Knocking and pinging noises from an engine are indicators of underlying issues. If the knocking sound in engine becomes louder and then finishes with a bang and some metallic grinding or screeching, you’ll need to take your car in for expensive repairs. The presence of an engine knock in conjunction with the activation of the check engine light is indicative of the necessity for maintenance or a visit to a service center.

In this article, we’ll look at some of the reasons behind the ticking noise in engines and its solutions.

What Are The Reasons Behind The Knocking Sound In Engine?

Some of the reasons for the knocking sound in engines are explained below.

Bad Belt Tensioners Or Pulleys

Car Engine Noises

The knocking noise may also have another cause that isn’t the engine itself. It might be coming from the attachable belt. A belt linked to pulleys in the engine compartment is spun by the engine as the vehicle moves. To ensure a quiet, smooth rotation, the tension on this belt needs to be precisely right. Noises like rattling, clicking, and slapping may be produced by a loose belt, a malfunctioning tensioner, or a pulley that has been twisted out of shape. Replacement of the belt, adjustment of the tension, or the swapping out of a defective tensioner or auxiliary pulley is sometimes all that is required to quiet a noisy accessory belt.

Detonation Knock: Low Octane

car engine

Defining “detonation knock” is a necessary first step. The air and fuel combination for each cylinder burns in a precise, controlled detonation when the engine is running at peak efficiency. When the air-fuel combination in the cylinders is detonating in much more than one area at once, a knocking sound is produced. Spontaneous ignition of the air/fuel combination may occur. These little fireballs make a knocking sound as they crash against one another.

Your car may suffer engine knock if you use fuel with a low octane rating in a high-performance engine designed to run on high-octane fuels. Fuels with a higher-octane rating have a more even combustion and are less likely to experience knock. Putting normal petrol into a vehicle designed to run on premium fuel may explain the knocking noise it makes. For determining the optimal octane rating for your vehicle, check the manual that came with it.

Low Oil Pressure

low oil pressure

Additionally, engine knock may be brought on by low oil pressure. In an internal combustion engine, oil is used to lubricate the cam lobes, camshaft, lifters, rocker arms, and valve stems to help distribute the heat generated by these moving components. Oil is used to soak the lash, or space between components, in order to both lubricate and fill it. When the gaps between parts get too large, as may happen with age or insufficient oil pressure, the parts begin to clatter and knock against one another. On cold starts, before the oil has had a chance to reach all of the cracks in the engine, the knocking sound might be a little more apparent. Most contemporary engines rely on hydraulic lifters to reduce lash and knock, but they are equally prone to low oil pressure. Low-grade or low-quality oils may thin at high engine temperatures, preventing the formation of optimal oil pressure.

The use of engine oil specified by the manufacturer should result in enough oil pressure, excluding a leak in the oil system. Indicators of an oil leak include oil on the ground beneath the engine or around the seals.

and white ash on the spark plugs.

What’re The Solutions To The Knocking Sound In Engine?

car engine

In certain cases, fixing a ticking in engine might be a hassle. These are some of the most often used methods for solving ticking noise in engine.

  • Engine bearing replacement is a very labor-intensive repair that must be done. When this happens, it’s time to inspect your engine and reset any bearings that might have been blown away by vibration or other engine issues. Even though it will take a lot of time and effort, this will have your engine running like new again.
  • You should change the timing belt. A rubber belt will be used to regulate and manage your engine’s timing in the vast majority of smaller cars, along with most four-cylinder sedans. Unfortunately, all rubber belts ultimately fail due to stretching, corrosion, or wear. To avoid this, always replace your timing belt as the manufacturer suggests. When you replace your timing belt, you’ll need to get your timing adjusted to get everything back in sync. Most people lack the background and expertise to execute it successfully on their own. To further ensure your engine runs smoothly, a timing chain is used in most bigger cars.
  • The fuel must be changed. Using gasoline that lacks the necessary octane for your car is one of the possible causes of the ticking in engine. Many high-performance or high-compression engines can only function properly when supplied with premium fuel. If you’re hearing ticking in engine and you should know that premium fuel is required for your vehicle, you must convert to premium fuel immediately. This may stop the problem from worsening until your car is serviced.


If you can’t fix the ticking noise in engine, contact an expert to find out why. I hope you have got a clear understanding of the reasons and solutions for knocking sound in engine by reading this article.

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