Reasons Why Your Engine Is Knocking: Causes and Solutions

If you’re hearing an engine knocking noise, don’t panic. It could be a number of things causing the issue, and most of them are easy to fix. In this blog post, we will discuss the causes of engine knocking and some solutions that you can try. Keep in mind that not all engine knocking noises are created equal, so it’s important to have your car diagnosed by a professional if the problem persists.

What Does Engine Knocking Feel Like?

Engine knocking feels like a series of light taps that get progressively louder. It’s important to address the issue as soon as possible, as the knocking noise can lead to serious damage if left unchecked. Family Handyman explains that the pinging, or knocking, is audible evidence of premature combustion happening in one or more cylinders. It can be a problem with expensive consequences if you ignore it for too long.

A well-working engine depends on accurate timing to provide optimum power, efficiency, and wear. The rotating crankshaft alternately drives the piston up through the cylinder and then is driven back by the force of the piston as it descends.

Simplified, the descending piston draws fuel and air into the cylinder, and then the ascending piston compresses the fuel/air mixture to optimize the power released at the point of ignition. This process happens repeatedly in each of the cylinders in your engine block. Due to careful engineering, each spark plug is energized as the crankshaft reaches a specific position in its rotation. Your vehicle’s timing manages the force of all the cylinders and keeps them pushing the crankshaft in the same direction.

Why is My Engine Knocking?

Now that you know what engine knocking feels like, let’s take a look at some of the causes.

Low Oil

One of the most common causes of engine knocking is low oil. If your car has been using more oil than usual, it’s a good idea to top it off. You can also try using a higher-quality oil, as this can help reduce engine wear. It’s important to regularly change your oil because dirty oil can also cause knocking.

Old Spark Plugs

Another possible cause is dirty or old spark plugs. Spark plugs that are overdue for a replacement can cause engine knocking, as can plugs that are dirty or covered in oil. Replacing your spark plugs may help fix the issue.

Faulty Fuel Pump

A faulty fuel pump can also cause engine knocking. This is because a faulty fuel pump will not be able to properly deliver fuel to the engine. When this happens,  the air/fuel mixture can become too rich, which can cause the engine to knock. If you think that your fuel pump may be the problem, it’s a good idea to have it checked by a professional.

Bad Gaskets or Seals

Gaskets and seals are important for preventing leaks in your engine. If these gaskets or seals are faulty, it can cause the engine to knock. If you think this may be the problem, you can try replacing the gaskets or seals yourself, or take your car to a mechanic for repair.

Damaged Piston

A damaged piston can also cause engine knocking. This is because a damaged piston can no longer accurately compress the air/fuel mixture, which can lead to knocking. If you think your piston may be damaged, it’s best to have a professional take a look at your car.

Worn-out Engine Bearings

Engine knocking may be caused by worn-out engine bearings. If the bearings are worn, they will not be able to support the weight of the engine, which can cause it to knock. Replacing the bearings may fix the issue.

Get Help From Scott’s Auto

If you’re still not sure what’s causing your engine knocking, take your car to a Scott’s Auto for a diagnosis. At any of our locations, our team of professionals will be able to tell you what’s causing the noise and how to fix it. To see a full list of our locations, click here. We’ll see you soon!