ECCPP Ignition Coil and Iridium Spark Plug Kit for Infiniti 3.5L & 2.5L — Set of 6, Direct-Fit OE Replacement

Complete six-cylinder ignition kit: six ECCPP UF550 replacement ignition coils paired with six 1406 iridium spark plugs, engineered to restore steady spark and reliable starts for compatible Infiniti models.

This all-in-one ignition coil and spark plug set from ECCPP is designed for direct fit on a range of Infiniti 3.5L and 2.5L engines. The kit replaces worn factory coils and plugs with components built to match OE specifications—featuring iridium center electrodes for long service life and coils with robust cores and heat-resistant boots. Everything ships as a plug-and-play bundle so you can swap all six cylinders and return the engine to smoother idling and consistent ignition timing.

Which Infiniti models will this ECCPP kit fit?

This kit lists compatibility across multiple Infiniti vehicles from model years 2007–2020. It covers EX35, FX35, G25, G35, JX35, M35, M35h, Q50, Q70 and QX60 with the specified 2.5L and 3.5L engines. Always confirm your OE part numbers before purchase or use a vehicle fitment tool to verify compatibility.

• Compatible with EX35, FX35, G25, G35, JX35, M35, M35h, Q50, Q70, QX60 models
• Covers 2007–2020 model years for listed engines
• Recommended: verify OE numbers such as 22448-JA10C/22448-JA11C before ordering

How do these coils and plugs improve engine performance?

Worn ignition coils or fouled plugs lead to misfires, rough idle, and reduced power. Replacing both the coils and spark plugs at once helps restore even cylinder firing, consistent spark energy and smoother throttle response without requiring ECU tuning.

• Iridium plugs preserve spark stability and resist wear for long service life
• Coils built with silicon steel cores and varnished windings maintain spark strength
• Direct-fit design reduces installation time and error risk

What are the technical specifics I should know before installing?

The ECCPP kit mirrors OEM electrical and mechanical specifications to ensure proper operation. Coil primary and secondary resistances are within OE tolerances and the plugs use a 1.0–1.1 inch gap tailored for the listed engines.

• Coil primary resistance: 0.72 ±10% ohms; secondary: 14.62 ±10% KΩ
• Spark plug: iridium center electrode, 12 mm thread diameter, 15–20 N·m torque
• Mount type: bolt-on coil with blade terminal; valve-cover mounting location

Is installation straightforward for a home mechanic?

Yes—this set is engineered for plug-and-play replacement with no separate instruction manual included. Basic hand tools and a torque wrench are recommended for safe, even installation and to avoid over-tightening the spark plugs.

• Includes six coils and six pre-gapped iridium plugs for complete cylinder coverage
• Standard bolt-on coil installation and blade terminals simplify the swap
• Use a torque wrench: 15–20 N·m for spark plug installation

Who is this for: This ECCPP UF550 & 1406 kit is aimed at Infiniti owners, independent mechanics and DIY enthusiasts who need a full ignition refresh on compatible 2.5L and 3.5L engines. It suits anyone replacing a failing coil pack set or worn plugs and wanting OE-matching specs, longer-lasting iridium electrodes and a straightforward, complete six-cylinder repair solution.