Ignition Coil and Iridium Spark Plugs for Jaguar XK8 (1999-2002) 4.0L

Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 1999-2002 Jaguar XK8

What it Does: Restores factory ignition energy and precise combustion timing across all 8 cylinders by replacing degraded OEM coils and fouled spark plugs.

The Stock XK8 Thermal Degradation Problem

The 4.0L AJ-V8 engine bay experiences substantial thermal soak within the enclosed spark plug wells. Over time, the factory coil packs suffer internal dielectric breakdown as continuous heat cycling degrades the primary and secondary copper windings. This leads to micro-arcing, intermittent secondary voltage dropouts, rough cold idling, engine misfire codes (P0300-P0308), and premature fouling of traditional spark plug electrodes under sustained load.

The Engineering Solution

This complete 8-cylinder ignition kit addresses thermal fatigue by utilizing premium high-density copper windings insulated with high-grade epoxy resin to withstand extreme cylinder head temperatures. The direct-fit blade terminal connectors maintain solid electrical contact without signal noise, while the matched fine-wire iridium spark plugs provide superior spark stability, high thermal conductivity, and lower required firing voltage for consistent, complete fuel burn across the entire RPM band.

Technical Specifications

Compatibility

• 1999 Jaguar XK8 Base Coupe 4.0L V8 (AJ27)
• 1999 Jaguar XK8 Base Convertible 4.0L V8 (AJ27)
• 2000 Jaguar XK8 Base Coupe 4.0L V8 (AJ27)
• 2000 Jaguar XK8 Base Convertible 4.0L V8 (AJ27)
• 2001 Jaguar XK8 Base Coupe 4.0L V8 (AJ27)
• 2001 Jaguar XK8 Base Convertible 4.0L V8 (AJ27)
• 2002 Jaguar XK8 Base Coupe 4.0L V8 (AJ27)
• 2002 Jaguar XK8 Base Convertible 4.0L V8 (AJ27)

The Jaguar Precision Standard

Engineered to meet strict European engine management parameters, this direct-replacement assembly prevents check engine lights and guarantees OE-level signal communication with the Jaguar powertrain control module.