Engine Ticking Noises: What do they mean?

That sharp ticking sound coming from under your bonnet can be both confusing and worrying.

Is it something minor - or a sign of serious engine trouble?

Regardless of the scenario, it’s important to understand what’s causing it.

Quick Diagnostic Table: Engine Ticking Noise

Before we get into the more in depth discussion on engine ticking or knocking noises. Here is a quick diagnostic table to help you try to pinpoint what kind of issue your car may have.
 

Common Causes of Engine Ticking Noises

There are a few common causes which can lead to an engine making ticking noises. Some of which are not too serious and can be fixed by yourself. Others are more critical and will require the help of a mechanic.

Low engine oil or pressure

When your engine doesn't have enough oil or the pressure is too low, metal components aren’t lubricated properly, leading to ticking sounds from friction.

Faulty spark plugs

Loose or worn spark plugs can cause combustion gases to escape, creating a ticking noise that sounds like it's coming from the top of the engine.

Exhaust manifold leaks

A crack or loose bolt in the exhaust manifold can let gases escape early, producing a rhythmic ticking, especially when the engine is cold.

Dirty or worn lifters

Lifters that are clogged with oil deposits or worn down over time can make a ticking or clicking noise due to poor valve operation.

Worn timing chain

A slack or worn timing chain can cause irregular ticking noises as it slaps against surrounding engine parts instead of running smoothly.

Knocking rods (rod knock)

Worn connecting rods inside the engine can knock against each other as the pistons move, creating a deep, metallic ticking or knocking sound.

Is It Safe to Drive with a Ticking Noise?

You may be wondering whether you can continue to drive a car with an engine that is making ticking noises.

The answer will unfortunately depend on the issue. Not all knocking sounds are the same and they can be the symptom of different issues.

For this reason, it is not a good idea to drive a car with engine knocking sounds. You should try to work out what the issue is that is causing this and if possible, rectify it.

If it is a serious problem, you should consult a mechanic and have the issue fixed by a professional – to ensure that the problem does not put yourself or any other road users in danger.

Engine Ticking - Signs of urgent problems

In some cases you can fix the issue yourself. Such as topping up your engine oil. However, there are cases where the engine ticking noise is being created by an issue which require expert help.

In extreme cases if the engine starts ticking alongside some other signs, you should stop the car as quickly and safely as you can – pulling over to the side of the road.

Signs to look out for that indicate a critical and dangerous issue are:

• check engine light comes on
• car begins jerking
• smoke can be seen coming from under the bonnet
• burning smells or strong exhaust fumes

This is not an extensive list and it’s always best to err on the side of caution.

If you feel there is something wrong, always play it safely and stop the car. Don’t ignore it. Driving with these signs could result in catastrophic engine damage, expensive repairs, or even complete engine failure.

Regular Servicing Helps Prevent Engine Ticking Noises

Routine car servicing isn’t just about ticking boxes for your vehicle's warranty.

It plays a crucial role in protecting your engine from wear, damage, and costly repairs.

One of the most overlooked benefits of regular maintenance is its ability to prevent ticking noises caused by poor lubrication, worn components, or build-up of contaminants.

Make sure to have your car serviced on a regular basis. Not only will this help with the maintenance of your vehicle, but it also helps to keep things optimised and working for as long as possible. Something that is very important when it comes to booking your MOT Test.

Engine Ticking Noise - FAQs

Can I drive with a ticking noise?

Although not all engine knocking or ticking noises are critical issues, it is best not to drive your car once is starts making ticking noises. Your best course of action is to diagnose the cause of the sound and have this fixed as soon as possible.

Will changing my oil stop the ticking?

If the noise is being created due to lack of oil or poor oil pressure, then topping up or changing oil can in some circumstances help to stop the noise. However, it is important to note that this is not a fix all solution. Different issues can be the cause of your engine ticking. It is best to correctly diagnose the problem, so the correct solution can be found.

Is ticking the same as knocking?

Yes, in many instances. Ticking noises and knocking noises are often used interchangeably by motorists when discussing the noise that an engine makes when there is a problem. It will depend on the individual and the problem.