HOW SPARK PLUGS WORK:

The first thing you should know about spark plugs is that they are only used in petrol engines. Diesel engines use a different component called a glow plug.

Spark plugs
- Step 1) A mixture of petrol and air is sucked into the combustion chamber by the piston moving down inside the cylinder.
- Step 2) The petrol & air mixture is squeezed in the combustion chamber by the piston moving up inside the cylinder.
- Step 3) The petrol & air mixture is ignited by the spark plug. this causes an explosion inside the combustion chamber. The force of the explosion pushes the piston back down inside the cylinder.
- Step 4) The spent gasses that result from the explosion are then forced out of the combustion chamber by the piston.


When should you change your spark plugs?
Spark plugs wear out and need to be changed. The recommended change intervals vary from car to car but as a rule of thumb it should be every 15,000-20,000 kms. Worn plugs will result in reduced fuel economy and reduced engine power.
Which spark plugs do I need?
The easiest way to select the correct spark plugs for your car is by using our reg lookup system. Our system will show you multiple brands of plug, all of which will be suitable for your car, you just need to check the descriptions carefully in-case of limitations and then choose your preferred brand or price point.
How do I fit new spark plugs?
Fitting new spark plugs is one of the easier DIY jobs you can do with very little equipment or experience. The key points to remember are:
- Take extra care not to cross thread the new plugs when fitting them, they should screw in with very little resistance
- Don’t over tighten the plugs – Check the correct torque settings & use a torque wrench where possible
- Make sure you re-fit the HT/ignition leads in the same position (it may help to number them)
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