The major job of the Volvo V40 Ignition Coil is to step up the battery's twelve volts to up to forty thousand volts to allow the spark plugs to ignite the fuel mixture and sustain the engine in operation. Each coil is housed, and the two copper windings are wrapped around an iron core; the thick primary winding forms the magnetic field when current is on, and the fine secondary winding takes the sudden burst when the field collapses, all of which provide towering voltage over the high tension tower. Early versions of Volvo applied a single coil to supply a distributor, in which a rotor rotated within the cap to direct the charge to all the cylinders using high tension leads. With the advance of electronic controls, Volvo adopted distributorless packs, containing two or more coils, which generate a high spike of spark to paired cylinders with each revolution of the crankshaft, a design generally referred to as waste spark. The new design of most later Volvo petrol engines is a coil-on-plug with one Ignition Coil located directly in front of each spark plug, which reduces the weight, removes the long wires, improves throttle response, and prevents misfire due to heat and vibration. No matter the arrangement, fraying plug gap or corroded connection causes the Ignition Coil to overwork and may result in the V40 stumbling, lighting the check engine light, and burning lots of fuel.
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