Tell-tale signs your Spark Plugs are failing

Spark Plugs


When was the last time you changed your Spark Plugs? In fact, when was the last time you even thought about your Spark Plugs?

Spark Plugs are the unsung heroes of your vehicle. They ignite the mixture of air and fuel within the cylinders of your engine – which keeps you moving – and are vital to your vehicle’s ignition system.
Checking them regularly could prevent serious damage to your vehicle. At Wilco our Reg Finder makes it easy to find the correct plugs for your vehicle. Our friendly, expert staff can even fit them for you too.

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What are the signs your Spark Plugs are failing?

Engine has a rough idle

If your Spark Plugs are failing your engine will sound rough and jittery when running at idle. This can cause vibrations to resonate through the vehicle which could cause further costly damage.

Trouble starting

Car won’t start and you’re late for work… Flat battery? Low fuel? One often overlooked cause is Spark Plug failure. Without that crucial spark for ignition, you’ll be stuck where you are.

Engine misfiring

When your engine misfires it momentarily cuts out and feels jerky because the cylinders are not firing correctly. This can lead to an uncomfortable ride and higher emissions.

Engine surging

Again, this can lead to an uncomfortable – and potentially dangerous – ride. The engine is working inefficiently, sucking in more air than is usually needed in the combustion process, causing continual stop-start motions.

High fuel consumption

Are you filling up more than you used to? Failing Spark Plugs can really take a bite out of your fuel efficiency. A simple change of Spark Plugs could be the solution.

Lack of acceleration

If your vehicle feels unresponsive and the accelerator has lost its sensitivity you might consider a service with a change of Spark Plugs to get things up to speed again.


If you’re unsure, simply pop into your local branch or send us a message, our friendly staff will be happy to advise you.