HENGCOOL Ignition Coil & Iridium Spark Plug Kit UF553 for Ford/Lincoln 3.5–3.7L — Direct-Fit, OE-Style Reliability

HENGCOOL UF553 is a direct-fit ignition coil and iridium spark plug kit engineered to replace worn units on Ford, Lincoln and select Mazda 3.5L/3.7L V6 engines for reliable spark delivery and smoother idle.

This complete kit pairs high-quality ignition coils with iridium spark plugs manufactured to match OE fitment and electrical characteristics. The assemblies are designed for non‑turbo (non‑EcoBoost) V6 engines and cover a broad range of Ford, Lincoln, Mercury and some Mazda applications across several model years. Built and tested for thermal stability, vibration resistance and long service life, the kit aims to restore proper combustion, reduce misfires and help maintain fuel efficiency when installed correctly.

Which vehicles and engines are these HENGCOOL coils and plugs compatible with?

These parts are intended for naturally aspirated Ford and Lincoln V6 engines in the 3.5L and 3.7L family, and for select Mazda models. They are not suitable for turbocharged Ecoboost engines. Always verify year, engine size and OEM part numbers before ordering.

• Ford: Edge (2007–2016), Explorer (2011–2016), F‑150 XL/XLT (2015–2016), Flex (2009–2016), Fusion (2010–2012), Mustang 3.7L (2011–2016), Transit 3.7L (2015–2016)
• Police & Special Use: Police Interceptor Sedan/Utility (2013–2016)
• Lincoln: MKZ, MKX, MKS, MKT across listed years (see fitment list)
• Mercury & Mazda: Mercury Sable (2008–2009), Mazda 6 compatible in some 3.7L years

How do these coils and spark plugs improve engine performance?

Replacing degraded coils and worn iridium plugs restores consistent spark energy, which reduces misfires and stabilizes idle. While not a cure-all for mechanical issues, fresh ignition components promote more complete combustion and smoother throttle response.

• Restores correct spark timing and intensity for each cylinder
• Helps reduce rough idling and intermittent misfires
• Supports efficient fuel burn that can aid throttle feel and emissions

What are the technical specifications I should know before installing?

The kit follows OE-style specifications to ensure plug fit and coil connector compatibility. Familiarize yourself with thread sizes, connector pins and preset gaps to avoid fitment and performance problems.

• Compatible OEM replacement numbers: UF553 / UF‑553 and many cross references listed by the manufacturer
• Ignition coil connector: 2‑pin design to match vehicle harness
• Spark plug specs: 14mm thread, heat range 6, 16mm (5/8") hex, preset gap 0.044 in

Is installation difficult and what durability can I expect?

Installation follows standard ignition coil and plug replacement procedures and typically requires basic hand tools and torque control for the plugs. Components are manufactured to endure temperature swings and vibration, with factory testing for thermal shock and humidity.

• Designed to match OE dimensions for bolt‑in replacement
• Undergoes vibration and thermal testing for reliability
• Suitable for DIY replacement or professional installation

Who is this for: This HENGCOOL UF553 coil and iridium plug kit is intended for owners or technicians maintaining naturally aspirated Ford/Lincoln/Mazda V6 3.5L and 3.7L engines who need an OEM‑style replacement at a value price. It’s appropriate for drivers experiencing misfires, rough idle, decreased fuel economy or those performing routine tune‑ups. Before purchasing, confirm your vehicle year, engine displacement and OE part number to ensure proper fitment. If you’re uncertain about compatibility or installation steps, consult a service manual or a certified technician.