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

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

What it Does: Replaces degraded factory coil packs and worn spark plugs with a matched 8-cylinder direct-ignition setup to restore secondary voltage stability and eliminate combustion misfires under forced induction.

The Stock XKR Thermal Breakdown and Ignition Quenching

In the supercharged 4.0L AJ27S platform, tight engine bay packaging generates significant thermal soak beneath the valve covers. Over time, OEM coil housings suffer micro-fracturing in the epoxy potting, leading to dielectric breakdown and secondary voltage leak to ground. Combined with aged spark plugs suffering increased electrode gap erosion, high cylinder pressures from the supercharger cause spark blowout, rough cold idles, and intermittent P0300 misfire DTCs.

The Engineering Solution

This comprehensive service kit pairs eight high-output coil-on-plug units with eight fine-wire iridium spark plugs. The ignition coils utilize premium electrolytic copper windings and high-dielectric thermoplastic housings to resist thermal fatigue and prevent voltage arcing. The matched iridium plugs feature a high-melting-point fine-wire center electrode and laser-welded ground core, significantly lowering required strike voltage while ensuring a crisp, uniform flame front under full supercharger boost.

Technical Specifications

Compatibility

• 2000 Jaguar XKR Base Coupe & Convertible 4.0L Supercharged V8
• 2001 Jaguar XKR Base Coupe & Convertible 4.0L Supercharged V8
• 2001 Jaguar XKR Silverstone Coupe & Convertible 4.0L Supercharged V8
• 2002 Jaguar XKR Base Coupe & Convertible 4.0L Supercharged V8
• 2002 Jaguar XKR 100 Coupe & Convertible 4.0L Supercharged V8

The Jaguar Precision Standard

Engineered to exact European OE electrical tolerances, this complete ignition overhaul restores smooth transient throttle response and maintains full-throttle spark energy without triggering false knock threshold readings or check engine lights.