X4XZ Ignition Coil & Double Iridium Spark Plug Kit — Ford 3.5L (2011–2017), 6-Coil+6-Plug OE Fit, Restores Smooth Idle

X4XZ UF646 ignition coil and SP534 double iridium spark plug kit replaces six coils and plugs to restore consistent spark and smoother running for 2011–2017 Ford 3.5L engines.

If your Ford Expedition, Explorer, F-150, Transit, or Lincoln model with a 3.5L EcoBoost has been showing misfires, rough idle, or reduced fuel efficiency, worn coils and plugs are common culprits. This complete 6-coil + 6-spark-plug set from X4XZ matches OE specifications (UF646 & SP534) and uses double iridium electrodes plus durable coil materials to improve longevity and electrical transfer. The kit is built for fast, no-fuss replacement and is supplied in a dealer-style configuration to simplify installation for DIYers and professional technicians alike.

How does this kit improve engine starting and smoothness?

The double iridium spark plugs produce a stable, focused spark that helps ignition reliability under a range of temperatures, while the coils deliver consistent high-voltage output to each plug. Together they reduce misfires, promote cleaner combustion, and help the engine settle into an even idle after cold starts.

• Double iridium plugs offer longer life and steady performance up to long service intervals.
• Precision-matched coils minimize voltage loss and resist heat-related damage.
• Replaces OE UF646 & SP534 numbers for correct fit and function.

Which Ford and Lincoln models are compatible with this kit?

This kit covers many 3.5L applications across Ford and Lincoln lineups from model years 2011 through 2017. It is intended for engines that originally used the UF646 ignition coil and SP534-style plugs; always verify fitment against your vehicle VIN or the second product image listing detailed fit information.

• Ford: 2013–2017 Explorer and 2011–2015 F-150 (3.5L) among others such as Transit and Police Interceptor models.
• Lincoln: 2013–2015 MKS/MKT and 2015–2017 Navigator 3.5L.
• See product images and OE numbers (DG549, IC749, BL3Z-12029-C) for exact replacements.

What makes the ignition coils and plugs durable?

The coils use high-grade materials including a stainless-steel spring and internal ferrite noise suppressor to protect electronics and ensure stable transfer of high voltage. The double iridium plugs are manufactured for extended mileage and consistent firing through prolonged service life.

• Stainless-steel spring and ferrite suppressor reduce radio interference and maintain conductivity.
• Thermoplastic coil connectors resist heat cracking and thermal cycling stress.
• Double iridium electrodes provide longer service life and consistent spark energy.

How easy is installation and what’s included?

The kit includes six ignition coil packs and six double iridium spark plugs, matching OE fitment so you can swap parts without modification. No printed manual is included, but the parts are designed to install using standard hand tools and routine ignition-service procedures.

• Package: 6 x UF646-style ignition coils + 6 x SP534 double iridium spark plugs.
• OE and replacement numbers provided for quick cross-referencing before purchase.
• 24-hour customer support and a one-year product service window from X4XZ for post-purchase help.

Who is this for: This X4XZ kit is aimed at vehicle owners, independent mechanics, and service shops working on 3.5L Ford and Lincoln engines that need a full ignition refresh. If your vehicle exhibits misfires, rough idle, decreased fuel economy, or you've reached recommended ignition service intervals, this direct-fit coil-and-plug set provides a practical, OE-comparable solution designed for longevity and reliable performance without aftermarket modification.