MAS Ignition Coil Set with Spark Plugs — 8 Straight-Boot Coils + Motorcraft SP546/SP515, Direct-Fit for Ford 5.4L V8

MAS eight-piece ignition coil set with straight boots plus Motorcraft SP546 and SP515 spark plugs is a direct-fit replacement kit engineered to restore reliable spark delivery for Ford and Lincoln 5.4L V8 engines.

This complete kit combines eight MAS straight-boot ignition coils and two Motorcraft spark plug models (SP546 and SP515) so you can replace the components most commonly involved in ignition issues in one service. Designed to match OE fitment and electrical characteristics, the set targets 2004–2008 Ford F-150, 2005–2008 F-250/F-350 Super Duty, 2005–2008 Expedition, 2006–2008 Mark LT, and 2005–2008 Lincoln Navigator applications that use the 5.4L V8. The package comes with a one-year limited warranty and lists compatible part numbers for easy cross-referencing when verifying fit.

How will this kit affect starting and engine smoothness?

Replacing worn coils and spark plugs can correct weak or intermittent spark that causes hard starting, long cranks, and rough idle. The MAS coils are engineered as direct replacements to restore consistent high-voltage delivery to the spark plugs, helping combustion occur reliably across all eight cylinders.

• Restores reliable spark for smoother idle and reduced misfires
• Helps shorten crank time and improve cold starts
• Designed to meet OEM electrical specifications for plug gap and firing energy

Which vehicles and part numbers are compatible with this kit?

This kit targets Ford and Lincoln trucks and SUVs equipped with the 5.4L V8 from model years listed; check your vehicle before ordering. The listing also includes interchangeable OEM and aftermarket part numbers to simplify compatibility checks with your original components.

• Fits 2004–2008 Ford F-150 5.4L, 2005–2008 F-250/F-350 Super Duty 5.4L
• Also fits 2005–2008 Ford Expedition, 2006–2008 Lincoln Mark LT, 2005–2008 Lincoln Navigator 5.4L
• Cross-references DG511, SP515, SP546, E508, 3L3E-12A366-CA and other common numbers

What specific problems can this replacement set help address?

The kit is aimed at common ignition-related drivability issues originating from degraded coils or fouled plugs. While it won’t fix unrelated mechanical or fuel-system problems, swapping in fresh coils and plugs often eliminates ignition faults that trigger check engine lights and poor performance.

• Can resolve misfires, intermittent check-engine-light codes, and rough running
• May reduce spark plug fouling and uneven cylinder performance
• Supports consistent transmission shift behavior by restoring stable engine operation

What’s included and what should I verify before installing?

You receive a full set of eight MAS straight-boot ignition coils plus Motorcraft SP546 and SP515 spark plugs—enough to address the entire ignition bank. Before installation, confirm your vehicle’s boot color and part cross-reference numbers to ensure you need straight-boot coils (brown-boot vehicles may require a different MAS part).

• Eight MAS straight-boot ignition coils and Motorcraft SP546/SP515 spark plugs included
• One-year limited warranty for added protection
• Verify year/make/model and original coil boot color (brown-boot vehicles need DG521)

Who is this for: This kit is intended for owners, mechanics, and fleet managers who maintain Ford and Lincoln 5.4L V8 vehicles from the mid-2000s and want a ready-to-install, OE-style replacement for failing ignition coils and worn spark plugs. It’s particularly useful during scheduled tune-ups or when diagnosing ignition misfires, hard starts, or rough running that point to coil and plug wear.