Ignition Coil and Iridium Spark Plugs for Jaguar XK (2007-2009) 4.2L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 2007-2009 Jaguar XK

What it Does: Restores factory secondary ignition output and precise combustion timing across all eight cylinders to eliminate engine misfires, erratic idle, and unburned fuel delivery.

The Stock XK Ignition Degradation

Due to the compact packaging of the Jaguar X150 engine bay, factory ignition coils endure severe thermal cycling that degrades the internal secondary insulation and epoxy potting over time. As internal resistance builds across aging OEM copper windings, spark voltage drops significantly under load, causing electrode gap bridge failure, hesitations, and micro-arcing. Simultaneously, worn standard spark plugs increase electrical load on the ECU coil drivers, triggering catalytic-damaging misfires.

The Engineering Solution

This comprehensive 8-cylinder service kit pairs heavy-duty coil-on-plug assemblies with fine-wire iridium spark plugs. The ignition coils feature high-conductivity copper windings, reinforced dielectric housings, and factory-matched direct-fit blade terminals that resist thermal breakdown. Coupled with high-melting-point iridium core electrodes that demand lower firing voltages and yield a more consistent flame kernel, this kit delivers stable combustion dynamics and long-term dielectric reliability.

Technical Specifications

Compatibility

• 2007 Jaguar XK Base 4.2L V8 (Coupe / Convertible)
• 2008 Jaguar XK Base 4.2L V8 (Coupe / Convertible)
• 2009 Jaguar XK Base 4.2L V8 (Coupe / Convertible)

The Jaguar Precision Standard

Engineered to meet the tight tolerances of high-performance European luxury grand tourers, this ignition set ensures zero diagnostic trouble codes (CEL-free operation), seamless ECM communication, and rapid cold-start firing.