Ignition Coil and Iridium Spark Plugs for Land Rover Range Rover (2006-2009) 4.2L 4.4L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 2006-2009 Land Rover Range Rover

Direct-fit ignition overhaul kit: Restores factory secondary ignition output, stabilizes idle, and eliminates misfires across the 4.2L Supercharged and 4.4L naturally aspirated AJ-V8 platforms.

The Stock Range Rover Ignition Breakdown

The AJ-V8 powertrain in the L322 Range Rover operates under elevated engine bay thermal loads, especially on supercharged 4.2L variants. Over time, OEM coil boots degrade from continuous heat soak, leading to micro-cracking in the silicone insulators and dielectric breakdown. This allows high-voltage current to arc to the cylinder head rather than bridging the spark gap, resulting in hesitation under load, erratic idle, P0300-P0308 misfire codes, and unburned fuel entering the catalytic converters. Concurrently, factory standard plugs experience electrode erosion, increasing gap resistance and overworking primary coil windings.

The Engineering Solution

This service kit features eight direct-replacement coil-on-plug assemblies engineered with heavy-gauge internal copper windings and high-dielectric epoxy potting to withstand severe thermal cycling. Paired with eight fine-wire iridium spark plugs, this setup ensures minimal quenching and lower firing voltage requirements. The corrosion-resistant blade terminals and OEM-matched direct-fit connectors ensure full signal fidelity, maintaining uniform spark energy across the combustion chamber to restore engine efficiency under boost or high-load conditions.

Technical Specifications

Compatibility

• 2006-2009 Land Rover Range Rover HSE (4.4L V8 Naturally Aspirated)
• 2006-2009 Land Rover Range Rover Supercharged (4.2L V8 Supercharged)

The Land Rover Precision Standard

Engineered to meet exact European luxury SUV diagnostic thresholds, this ignition kit maintains OE dwell times and precise resistance values. It ensures seamless integration with factory engine management modules to prevent check engine lights while restoring smooth, refined cruising power.