Ignition Coil and Iridium Spark Plugs for Jaguar XKR (2003-2009) 4.2L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 2003-2009 Jaguar XKR

Primary Function: Restores factory secondary ignition performance and eliminates high-load misfires on the supercharged 4.2L AJ-V8 platform.

The Stock XKR Ignition Degradation

Under the thermal strain of the Eaton M112/Roots-type supercharger and tight engine bay packaging in the X100 and X150 chassis, factory coil packs suffer severe dielectric breakdown. Over time, heat cycles degrade the internal epoxy insulation and primary/secondary copper windings, causing spark blow-out, erratic cold starts, reduced fuel economy, and P0300-series cylinder misfire fault codes.

The Engineering Solution

This comprehensive ignition service kit features eight direct-fit coil-on-plug assemblies engineered with high-grade internal copper windings and robust thermal-resistant boots to prevent voltage arcing. Paired with eight fine-wire iridium spark plugs, the kit delivers a concentrated spark kernel, superior resistance to carbon fouling, and stable combustion under sustained boost pressures up to redline.

Technical Specifications

Compatibility

• 2003-2006 Jaguar XKR Base/Convertible 4.2L Supercharged V8 (X100)
• 2007-2009 Jaguar XKR Base/Convertible/Portfolio 4.2L Supercharged V8 (X150)

The Jaguar Precision Standard

Engineered to exact OEM resistance specifications, this direct-replacement ignition kit ensures factory ECU synchronization, smooth idle stabilization, and clean CEL-free operation under aggressive grand touring conditions.