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Block ignition coil has an built-in ignition module, usually 2, 4 or 6 ignition coils that control multiple spark plugs through the ignition lead without the need for a distributor. The ignition module adopts advanced chips, a car ignition coil with stable quality and accurate signal. Key Features of Block Ignition Coils ignition coil block with stable quality. ignition coil block with accurate signal. How Do You Test Block Ignition Coils？ Block ignition coils have types for one outlet, two-outlet, four-outlet or six-outlet. When the twin-cylinder block ignition coils fail, it will cause two or four cylinders to not work (take a four-cylinder engine as an example), which manifests as the engine cannot be started or is difficult to start, idling stalls, and poor acceleration.