Replacing Single Ignition Coil vs. Two-Coil Setup on Jaguar XJS V12 (Lucas Ignition)

If you own a Jaguar XJS V12 built before mid-1989, your car originally came equipped with a dual ignition coil setup. This design was intended to improve ignition performance by allowing faster coil charging at higher RPMs. However, maintaining this dual-coil system can be costly and inconvenient, especially as replacement parts become harder to find.

Fortunately, there is now a single replacement ignition coil available that eliminates the need for the original two-coil setup. This modern solution is not only more cost-effective but also simplifies maintenance without sacrificing performance. The single-coil upgrade integrates seamlessly into the existing ignition system, ensuring reliable operation.

For those with late-model XJS V12s, the ignition system moved away from the traditional cap and rotor setup. Instead, each cylinder is equipped with an individual coil mounted directly on top of the spark plug. Over time, these coils can degrade and fail, leading to performance issues. If you experience misfires, rough idling, or difficulty starting, it may be time to replace them.

Upgrading to a single ignition coil or replacing individual coil packs is a straightforward DIY task that can enhance engine reliability and performance. If you’re considering this upgrade or need replacement coils, we offer high-quality parts to keep your XJS V12 running at its best.