X4XZ Ignition Coil & Double-Iridium Spark Plug Kit — 6-Pack for 3.5L Ford/Lincoln (2011–2017) UF646+SP534

Complete 6-pack ignition coil and double-iridium spark plug kit engineered to restore consistent ignition, reduce misfires, and improve throttle response for 3.5L Ford and Lincoln engines (2011–2017).

This X4XZ UF646 + SP534 combo replaces worn coils and plugs with components built to match or exceed original equipment specifications. The kit includes six ignition coil packs and six double-iridium spark plugs selected for long life, stable spark performance, and reliable connection under thermal cycling. It’s intended as a direct-fit replacement for many Ford and Lincoln 3.5L applications—helping revive rough-idle vehicles, reduce engine hesitation, and support smoother starts.

Which vehicles and engines will this kit fit?

This package is designed for a wide range of Ford and Lincoln models using the 3.5L V6 between 2011 and 2017. Compatibility covers passenger vehicles, SUVs, trucks, and police/interceptor variants—confirm fitment against your VIN or the vehicle list before purchase.

• Ford: Expedition, Explorer, F-150, Flex, Taurus, Transit 150/250/350/350 HD, Police Interceptor Sedan & Utility (various years 2011–2017)
• Lincoln: MKS, MKT, Navigator (2013–2017)
• OE and replacement numbers such as UF646, SP534, DG549, IC749 are referenced for cross-checking

How do these coils and double-iridium plugs improve engine performance?

The ignition coils are made with high-quality insulation and ferrite noise suppression to deliver stable high-voltage pulses. The double-iridium spark plugs provide a narrow, durable electrode profile for consistent firing and extended service life, which together help minimize misfires and restore smooth running.

• Double-iridium electrodes resist wear and maintain spark consistency over long intervals (up to 100,000 km typical lifespan)
• Stainless-steel spring and ferrite suppressor reduce radio-frequency interference and protect ignition timing
• Thermoplastic coil connector resists heat-related cracking and ensures snug electrical contact

What should I expect during installation and maintenance?

Each coil pack and spark plug is sized to be a direct or near-direct OE replacement for the listed vehicles, which streamlines swap-out jobs. Basic hand tools and a torque wrench are usually all that’s required; technicians and competent DIYers can replace all six towers and plugs in a single service session.

• Pack contents: 6 ignition coil packs + 6 double-iridium spark plugs (no printed manual included)
• Recommended: inspect spark plug wells, anti-seize not required for iridium plugs, torque plugs to manufacturer spec
• If you encounter fit or quality questions, X4XZ provides 24-hour customer support and a 1-year product service period

Are these parts equivalent to original equipment numbers?

The kit lists OE cross-references and common replacement numbers so you can verify interchangeability. Components either match or improve on original designs for electrical transfer, suppression of interference, and longevity of electrodes.

• Primary references: UF646 (coil) and SP534 (plug)
• Replacement references included for cross-checking: DG549, IC749, 2505-484814, BL3Z-12029-C, E1146, CYFS-12-Y3, and others
• Designed to meet factory mounting, connector fit, and electrical performance expectations

Who is this for: This X4XZ kit is aimed at owners and technicians maintaining Ford or Lincoln vehicles with the 3.5L V6 who need a full set replacement of ignition coils and spark plugs. It’s well suited for cars showing misfire codes, rough idling, reduced power, or for preventative maintenance to restore ignition reliability and extend service intervals. If you want parts that align with OE fitment while offering durable iridium electrodes and robust coil construction, this kit is a practical upgrade for routine engine care.