Ignition Coil & Iridium Spark Plugs for Land Rover Defender 90 110 (2022-2023) 5.0L V8
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High-Performance Ignition Coil & Iridium Spark Plug Kit for 2022-2023 Land Rover Defender 5.0L V8
Direct-fit replacement ignition coil and iridium spark plug suite designed to restore proper combustion, eliminate misfires, and ensure consistent spark delivery under extreme loads.
The Stock Defender Ignition Weakness
OEM ignition systems on the AJ133 5.0L Supercharged V8 are notoriously susceptible to thermal degradation and voltage leak due to extreme under-hood temperatures. Continuous heat cycling breaks down standard coil pack potting material, leading to premature spark blowout, intermittent misfires under heavy acceleration, and compromised fuel efficiency. Standard nickel-tipped plugs wear rapidly under forced induction cylinder pressures, requiring frequent replacements to maintain optimal idle and throttle response.
The Engineering Solution
This kit overhauls the L663 ignition system using premium 12V direct bolt-on ignition coils engineered with high-dielectric epoxy to resist heat soak and voltage leak. Paired with pre-gapped (0.7-0.8") high-performance iridium spark plugs, the system delivers a hotter, more stable spark than traditional platinum or nickel components. The iridium center electrode ensures precise spark localization, reducing ignition delay while withstanding the intense cylinder pressures of the AJ133 V8. Features include a 14mm hex, 28mm reach, and optimal 3-12KΩ resistance for seamless ECU communication.
Technical Specifications
| Fitment | 2022-2023 Land Rover Defender 90 / 110 |
| Engine / Chassis | AJ133 5.0L V8 / L663 |
| Stock Output | 518 hp / 461 lb-ft (Approx) |
| Part Number | UF-730, DX2312A366AC, LR035548, NGK93476 |
Compatibility
- 2022 Land Rover Defender 90 5.0L V8
- 2022 Land Rover Defender 110 5.0L V8
- 2023 Land Rover Defender 90 5.0L V8
- 2023 Land Rover Defender 110 5.0L V8
The Land Rover Caliber
The L663 Defender demands unrelenting reliability off-road and on the highway. Upgrading to these precision-engineered coils and iridium plugs ensures optimal towing performance, smooth power delivery, and steadfast durability in harsh overlanding conditions without triggering a check engine light.
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