NGK U4031 / 48379 Ignition Coil Genuine NGK ComponentEssentially the operating principle is the same for all types of ignition coils- whether the classic can-type coil, or in a coil rail system. The device contains two copper wire windings and a laminated iron core. The copper wires are insulated to prevent short circuits. The battery current fed through the primary winding produces a magnetic field whose strength is further increased by the iron core. When this circuit is opened, the magnetic field collapses, inducing a high voltage pulse in the secondary coil.U4 Type Ignition CoilOne ignition cable is required for each coil The NGK ignition coil of the Type U4 is a pencil coil with double spark technology. As a poloidal coil or coil-on plug, each provides two spark plugs with high voltage.If you are unsure as to whether this is the correct part for your vehicle, please don’t hesitate to contact us. Alternatively please use the cross reference table above.
