Ignition Coil & Iridium Spark Plugs for Jaguar XKR (2010-2012) 5.0L V8

High-Energy Ignition Coil & Iridium Spark Plug Kit for 2010-2012 Jaguar XF

Direct-fit replacement ignition coils and iridium spark plugs designed to restore lost spark energy, eliminate misfires, and ensure consistent combustion in the 5.0L V8.

The Stock X250 Ignition Weakness

The factory ignition coils on the 5.0L AJ133 V8 are notoriously susceptible to thermal degradation due to their placement directly over the cylinder banks. Over time, the intense heat cycles from the engine block break down the internal epoxy potting and primary copper windings. This thermal stress leads to internal resistance increases, voltage leaks, weak spark delivery, and localized arcing. The result is a cascading effect of engine misfires, rough idle, unburned fuel triggering check engine lights (CEL), and accelerated fouling of the standard spark plugs, especially under heavy throttle loads or forced induction environments.

The Engineering Solution

This comprehensive ignition kit tackles inherent AJ133 spark degradation by combining OE-plus grade ignition coils with premium iridium spark plugs. The upgraded coils feature heavy-duty copper wire internals and high-dielectric epoxy resin, significantly improving heat dissipation and resisting thermal breakdown in the XF's tight engine bay. This ensures maximum voltage transfer to the spark plug without bleed-off. The included iridium spark plugs boast an ultra-fine center electrode that requires less voltage to bridge the gap, generating a stronger, more concentrated spark kernel. This pairing delivers up to a 15% increase in spark efficiency, optimizing the air-fuel burn rate for smoother idle, restored throttle response, and robust power delivery across the entire RPM range.

Technical Specifications

Compatibility

• 2010-2012 Jaguar XF 5.0L V8 (Naturally Aspirated & Supercharged)
• 2010-2012 Jaguar XKR 5.0L V8 (Naturally Aspirated & Supercharged)

The Jaguar Caliber

Maintaining precision engineering requires high-caliber components. This ignition overhaul ensures your X250 operates without rough idles or phantom CELs, delivering the smooth, sophisticated power expected from a British V8.