Ignition Coil and Iridium Spark Plugs for Jaguar S-Type (2000-2002) 4.0L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 2000-2002 Jaguar S-Type

What it Does: Restores factory ignition energy and stabilizes secondary combustion across all eight cylinders by replacing degraded factory coil-on-plug packs and worn spark plugs with high-dielectric assemblies and fine-wire iridium electrodes.

The Stock S-Type Thermal Ignition Breakdown

The AJ28 4.0L V8 engine bay generates substantial heat soak that steadily degrades the factory ignition coils over time. Repeated thermal cycling hardens the silicone spark plug boots and causes micro-cracking in the internal epoxy insulation. As internal resistance climbs and dielectric integrity breaks down, high-voltage spark energy leaks to ground instead of reaching the combustion chamber. This results in intermittent hesitations, rough idle, loss of mid-range torque, catalytic converter fouling, and persistent misfire trouble codes (P0300 through P0308).

The Engineering Solution

This 8-cylinder ignition overhaul kit pairs high-output coil packs with laser-welded iridium spark plugs for maximum electrical efficiency. Each coil utilizes high-grade, oxygen-free copper windings potted in thermal-resistant resin to prevent internal arc-through under sustained engine load. Matched with direct-fit electrical blade connectors and pre-gapped iridium plugs, the system lowers required firing voltage, accelerates flame kernel development, and ensures clean, repeatable combustion under heavy throttle.

Technical Specifications

Compatibility

• 2000 Jaguar S-Type Base 4.0L V8 (AJ28)
• 2001 Jaguar S-Type Base 4.0L V8 (AJ28)
• 2002 Jaguar S-Type Base 4.0L V8 (AJ28)

The Jaguar Precision Standard

Engineered to meet stringent European OBD-II parameters, this ignition service kit prevents nuisance Check Engine lights while restoring the seamless power delivery, silent idle, and grand-touring refinement expected of the Jaguar X200 platform.