BELKEBIR Ignition Coil Packs & Iridium Spark Plugs Kit for 5.4L V8 (2004–2008) — 8-Pack, Straight Black Boots, Direct-Fit

BELKEBIR's set of eight ignition coil packs and matching iridium spark plugs replaces OE DG511/FD508-style coils and SP546 plugs for 5.4L V8 Ford and Lincoln engines from 2004–2008, providing a direct-fit, plug-and-play ignition service kit.

When an aging ignition system causes misfires, rough idle, or poor throttle response, replacing both the coils and plugs at once restores consistent spark timing and ensures all cylinders operate uniformly. This kit includes eight straight-black-boot coil packs designed to match factory mounting and electrical connections, plus high-grade iridium spark plugs that resist wear and support reliable starts. The components are manufactured to meet or exceed OEM dimensions and electrical requirements for seamless installation.

Will these coil packs and spark plugs fit my 5.4L V8 Ford or Lincoln?

Yes — the kit is engineered specifically for vehicles equipped with the 5.4L V8 engine from model years 2004 through 2008. It targets common OE part numbers and the straight black coil boot style used on those applications. Always verify your engine configuration and boot style before installation.

• Compatible models: Ford Expedition, F-150, F-250 Super Duty, F-350 Super Duty; Lincoln Navigator, Mark LT
• Fitment years: 2004–2008 (5.4L V8 engines)
• Coil boot style: straight black coil boots required
• Cross-references: DG511, FD508, C1541, IC558 and related OE numbers

How do these parts improve engine performance and reliability?

Replacing degraded coils and worn spark plugs restores consistent high-voltage output and reliable spark delivery to each cylinder. That consistency helps reduce misfires, smooth idle, and support better throttle response under load. Iridium electrodes extend service life and maintain stable firing characteristics over many miles.

• High-energy coils designed for steady voltage and minimal heat loss
• Iridium plugs offer superior wear resistance versus standard plugs
• Full-bank replacement prevents cylinder-to-cylinder imbalance
• OEM-spec electrical connectors and mounting points for secure fit

Is installation straightforward for a DIYer or should I use a shop?

Installation is intended to be direct replacement — the coils and plugs use original-style connectors and mounting locations for a plug-and-play swap. A basic tool set and torque wrench are recommended to seat plugs to specification and secure coils correctly. If you encounter seized bolts, damaged harnesses, or corrosion, a professional shop can save time and ensure correct diagnostics.

• Tools typically required: ratchet, spark plug socket, extension, torque wrench
• Torque specs: follow factory torque for spark plugs and coil bolts
• Recommended: replace boots and seals if brittle or cracked
• When to consult a mechanic: persistent misfires after replacement

Who is this for? This BELKEBIR kit suits vehicle owners and technicians working on 5.4L V8 Ford or Lincoln models from 2004–2008 who want a full-bank ignition refresh with OEM-style fit and upgraded plug longevity. It’s especially useful when one or more cylinders are misfiring, when coils show visible wear or cracking, or when plugs have exceeded recommended service intervals. Use this set to restore consistent ignition performance across all eight cylinders with components matched to the original design.