Maserati GranTurismo/Quattroporte Ignition Coil 78502005 OEM Replacement

On Maserati GranTurismo and Quattroporte equipped with 4.2L or 4.7L V8 engines, the ignition coil (OEM 78502005) is mounted above the cylinder head and converts low-voltage electricity to high-voltage to drive the spark plug for ignition of the air-fuel mixture. Replacement difficulty is medium; workshop time about 1.5-2 hours, needing to remove the intake manifold and ignition coil cover. Typical symptoms of coil failure include idle roughness, weak acceleration, engine warning light, or noticeably higher fuel consumption.