One of the most important ignition cable functions is to transfer spark energy from the distributor or magneto to the spark plug, establishing the spark that ignites the fuel mixture within the engine's cylinders. GarageMatch connects you with trusted auto repair shops in Canada through a quick and easy service request process. Repair shops will provide quotes or estimates for your specific make and model based on your description of the problem or issue. Compare prices, reviews, and availability to find the best shop for your vehicle and budget. ignite the fuel mixture in the engine's cylinders. The metal conductors at the heart of these rubber-protected cables periodically transmit extremely high electrical currents over a broad range of environmental conditions.