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Spark plugs create the current that ignites your fuel-air mixture. Without them, nothing would happen when you turn the engine on and you would be marooned.
In each cylinder head of your petrol engine, electrodes in your spark plugs connect to the ignition coil/distributor through an ignition cable, creating a spark of at least 20,000 volts.
Glow plugs are the equivalent car parts for diesel engines. While diesel combusts with hot, high-pressure air, petrol combusts with a spark.
Spark plugs should be replaced at every service. Different engines require different types and quantities. To identify the necessary replacements for your vehicle, enter your car details into our car part finder.
Spark plugs can’t be repaired, but they can be replaced without any technical expertise.
Locate your spark plugs under the bonnet; they may be concealed beneath an engine cover. Wait until the engine is cold and disconnect each ignition wire. Use a ratchet to remove the spark plugs. Lubricate your replacements and connect them to the ignition wires using the ratchet, referring to your car owner maintenance manual to check your required spark gap.
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