The Volkswagen Golf Ignition Coil takes the car voltage from the battery feed, which is twelve volts, and transforms it to tens of thousands of volts to power the spark plugs, ignite the fuel-air mixture, and keep the engine purring. Each coil, powered by either battery current through the primary or battery current through the output of the ECU or a previous breaker point, consists of two copper windings, one encircling an iron core, a thick, heavily wound primary and a fine secondary, with hundreds of turns around the core in the primary and a thousand in the secondary. When the magnetic field of an induction is reduced by a cut in battery current through the primary or battery current through the output of the ECU or a previous breaker point, the collapsing magnetic field causes between one hundred and forty thousand volts to jump. Distributorless wasted spark packs, where one coil feeds two cylinders per crankshaft rotation, have been applied by later Volkswagen engines, while early models applied a single coil feeding a distributor supplying the energy, via one high-tension lead and a rotating rotor, to all the cylinders. The powertrains of modern Volkswagen are more inclined to coil-on-plug units, each having its own Ignition Coil, which reduces the length of wire and refines the timing. The insulation can crack due to heat, vibration, or large plug gaps, which increases resistance, a common aging problem that manifests itself in misfires, rough idle, poor economy, or even a no-start. The faults are checked using scan tools, meters, or scopes, and by replacing the Ignition Coil with a new one, all modern Volkswagen Golf owners can regain smooth performance.
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