Ignition Coil and Iridium Spark Plugs for Jaguar XJR (1995-1997) 4.0L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 1995-1997 Jaguar XJR

What it Does: The ignition coil and iridium spark plug kit restores factory ignition energy and combustion efficiency on the 1995-1997 Jaguar XJR to eliminate misfires under boost and restore lost throttle response.

The Stock Jaguar XJR Secondary Breakdown and Spark Blowout

The supercharged inline-six in the X300 chassis relies on individual coil-on-plug modules subjected to intense cylinder head heat soak. Over thermal cycles, the factory epoxy encapsulation cracks, causing internal dielectric breakdown and secondary voltage leak down to the spark plug well. Under boost from the Eaton M90 supercharger, high cylinder pressures create extreme spark resistance. Weakened factory coils struggle to bridge wide gaps, resulting in spark blowout, stutter under acceleration, and uneven idle across cylinders.

The Engineering Solution

This comprehensive service pack combines heavy-duty coil packs with fine-wire iridium spark plugs to stabilize primary and secondary ignition circuits. Each coil features high-grade copper windings and thermoset potting compound to resist thermal cracking and dielectric failure. The paired iridium plugs feature ultra-dense, laser-welded fine-wire center electrodes that require less strike voltage while resisting erosion under forced induction. This setup delivers a crisp, consistent kernel to sustain complete combustion across the entire powerband without spark degradation.

Technical Specifications

Compatibility

• 1995 Jaguar XJR Base Sedan 4.0L Supercharged Inline-6 (AJ16)
• 1996 Jaguar XJR Base Sedan 4.0L Supercharged Inline-6 (AJ16)
• 1997 Jaguar XJR Base Sedan 4.0L Supercharged Inline-6 (AJ16)

Frequently Asked Questions

Does this fit the X300 XJR?
Yes, this is a direct fit for the 1995-1997 Jaguar XJR equipped with the supercharged 4.0L AJ16S engine.

Do the iridium spark plugs require gapping prior to installation?
The plugs arrive pre-gapped to factory forced-induction specifications, but gap verification with a non-contact feeler gauge is recommended before torquing.

The Jaguar Precision Standard

Engineered for European forced-induction standards, these components maintain precise dwell-time resistance and factory diagnostic protocol compliance to prevent false misfire codes and check engine lights.