Ignition Coil + Spark Plugs for Jaguar XK8 (1997-1998) 4.0L

Direct-Fit Ignition Coil and Spark Plug Tune-Up Kit for 1997-1998 Jaguar XK8 (X100)

What it Does: The ignition coil and platinum spark plug kit replaces aged, thermally stressed primary ignition components on the 1997-1998 Jaguar XK8 to eliminate misfires, stabilize idle, and restore combustion efficiency.

The Stock Jaguar XK8 Ignition Breakdown

Under-hood temperatures in the X100 engine bay subject coil packs to severe thermal cycling. Over time, the internal primary and secondary copper windings degrade, and the factory epoxy potting compound develops microscopic fractures. This insulation failure leads to internal dielectric breakdown, secondary voltage leakage, and unburned fuel entering the exhaust stream. Concurrently, factory plugs suffer from widened electrode gaps and carbon fouling, raising the ionization voltage demand beyond what weakened factory coils can discharge.

The Engineering Solution

This direct-replacement ignition service pack supplies eight application-specific coil-on-plug units engineered with high-temperature epoxy insulation and high-conductivity internal windings designed to resist dielectric fatigue. Paired with eight matched platinum-tipped spark plugs, the kit maintains a stable spark kernel under high-load, high-RPM cylinder pressures. Direct-fit electrical connectors match factory wiring harness pins to eliminate terminal resistance, preventing intermittent P0300 through P0308 diagnostic trouble codes and catalytic converter damage.

What's Included

• 8 Ignition Coils
• 8 Platinum Spark Plugs

Technical Specifications

Compatibility

• 1997 Jaguar XK8 Base 4.0L V8 (AJ26) Convertible / Coupe
• 1998 Jaguar XK8 Base 4.0L V8 (AJ26) Convertible / Coupe

Frequently Asked Questions & Fitment Warnings

Does this fit the X100 XK8?

Yes, this is a direct fit for the 1997-1998 Jaguar XK8 equipped with the 4.0L AJ26 engine; confirm coil connector style before ordering, as it does not fit 1999+ AJ27 or supercharged XKR variants.

Are spark plug wires required for this installation?

No, the 4.0L AJ26 uses an individual coil-on-plug setup where each coil mounts directly above its dedicated spark plug without secondary ignition leads.

The Jaguar Standard

European grand touring V8s require precise ignition timing and consistent secondary voltage delivery across all eight cylinders to prevent limp-mode engagement and preserve sensitive catalytic converters.