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The Term "Ignition module" can be applied to more than one item.
On older cars with a Distributor and coil pack, the ignition module is an electrical switch that turns the power on and off to the coil, which in tern causes the coil to generate a spark.
On more modern cars that do not have a distributor, but have fully computerised ignition systems, it usually refers to the ignition coil, which also incorporates the item mentioned above.
In both cases it's responsible for causing a surge of high voltage electricity to be supplied to the spark plugs to cause the petrol/air mixture in the cylinders to ignite.
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