Marsram Ignition Coil Pack & Spark Plugs for Ford F-150 1998–2003 5.4L V8 — 8-Coil/8-Plug Kit, Direct-Fit

Marsram's DG508 ignition coil pack set includes eight direct-fit coils and eight spark plugs engineered to restore reliable ignition for 1998–2003 Ford F-150 5.4L V8 engines.

This complete ignition kit is built as a straightforward replacement for worn or failing coils and plugs on many Ford, Lincoln and Mercury vehicles that use the 4.6L or 5.4L modular V8 layouts. Each kit provides the matched components needed to bring back consistent spark delivery, reduce misfires, and make installation simple for DIY mechanics and professional shops. The pack lists multiple OEM cross-references so you can verify fitment before ordering.

Will these coils and plugs fit my 1998–2003 Ford F-150 5.4L?

Yes—this kit targets models equipped with the 5.4L V8 from those model years. Always confirm vehicle compatibility by checking your engine size and cross-referenced part numbers before purchase.

• Designed for 1998–2003 F-150 5.4L V8 applications including Lariat/XL/XLT and Lightning variants.
• Cross-replaces DG-508, DG-457, DG-472 and several OEM numbers like 3W7Z12029AA.
• Includes eight coils and eight spark plugs for a full-bank replacement.

How does installing this kit affect engine performance?

Replacing aged coils and plugs can restore stable ignition timing and consistent combustion across all cylinders. That often results in fewer misfires, smoother idle, and steadier throttle response when the root cause is ignition-related.

• Reestablishes uniform spark delivery to each cylinder for balanced firing.
• Helps eliminate cylinder-specific misfires caused by weak coils or fouled plugs.
• Provides a matched set to avoid mixing old and new components.

What comes in the box and what tools will I need for installation?

The package contains eight ignition coils and eight spark plugs—enough to service a full V8 bank. Basic hand tools and a torque wrench are typically all that’s required for a safe, correct installation.

• Included: 8 Marsram ignition coils + 8 spark plugs; no additional parts necessary for standard swaps.
• Suggested tools: ratchet, appropriate socket set, spark plug socket, torque wrench, dielectric grease.
• Estimated time: 1–2 hours for an experienced DIYer, longer if removing intake components.

Does Marsram offer a warranty or support if something goes wrong?

Marsram backs this aftermarket kit with a 1-year limited warranty and customer support for product issues. Contact the seller promptly if you encounter defects or fitment problems so they can respond and resolve your concern.

• 1-year warranty covers manufacturing defects under normal use.
• Seller support advised to be contacted first for troubleshooting and replacement assistance.
• Keep vehicle and part information handy when reaching out to speed up service.

Who is this for: This Marsram DG508 coil and plug kit is aimed at owners and mechanics of late-1990s to mid-2000s Ford, Lincoln, and Mercury vehicles with 4.6L or 5.4L V8 engines who want a complete, like-for-like ignition refresh. It’s a practical choice for anyone experiencing misfires, rough idle, or routine maintenance needs who prefers a single-purchase solution that replaces all eight coils and plugs at once. Always confirm fitment against your VIN, engine size, and the cross-reference list prior to installation to ensure compatibility with your specific vehicle.