ECCPP UF550 Ignition Coils with 6 Iridium Spark Plugs - Nissan

In this review the ECCPP UF550 kit is evaluated as a budget-conscious replacement for failing ignition coils and spark plugs on a range of Nissan and Infiniti 3.5L V6 engines. It is best for owners who need a complete ignition pack to address misfires or rough idle and want an easy swap using parts that match common OEM part numbers. The single biggest reason to buy is the convenience of a matched set of six coils and six iridium plugs that are designed to meet or exceed OE specifications and improve starting and smoothness when installed together.

Key Features

• Direct Compatibility: The kit fits many Infiniti models including EX35, FX35, G35 and Q50/Q70/QX60 model years listed, making it a practical direct-replacement option for those engines.
• Complete Kit: Includes six ignition coils plus six iridium spark plugs so the entire bank is replaced at once to reduce mismatched wear and persistent misfire issues.
• OE Fit Reference: Replaces common OEM part numbers such as UF550 and 22448JA10C so buyers can match service records or dealer references.
• Improved Energy: ECCPP states the coils deliver about 15% more energy than OE coils, which can help crisper ignition and smoother running after installation.
• Durable Construction: Built with high conductive copper wire and high dielectric epoxy to help electrical connectivity and long service life under normal conditions.
• Performance Focused Spark Plugs: The included iridium plugs are intended to improve cold starts and longevity compared with standard plugs.

Who It's For

This kit is aimed at DIY mechanics and independent shops servicing Nissan and Infiniti vehicles with the 3.5L V6 that require replacement coils and plugs. It is particularly useful when multiple cylinders are misfiring or when the vehicle shows poor fuel economy and hesitation so replacing the whole set avoids leaving old coils paired with new plugs.

Owners who need long-term, guaranteed durability from high-mileage parts or those seeking manufacturer warranty support may prefer factory OEM parts from a dealer. Also, this kit is tailored to the specific model years and engines listed, so buyers should verify compatibility with their VIN or service manual before purchasing.

Pros & Cons

Pros

• Complete six-coil and six-plug kit simplifies repairs and ensures matched components across the bank.
• Designed to meet or exceed OE specifications with corrosion-resistant connections for reliable electrical contact.
• Many customers report improved smoothness and elimination of misfire after installation when parts are functioning correctly.

Cons

• Some users report premature failures within weeks, so durability can be inconsistent compared with dealer-sourced coils.

Specifications

Brand	ECCPP
Kit Contents	6 ignition coils and 6 iridium spark plugs
Compatible Engines	3.5L V6 (select Nissan and Infiniti models)
Replaces OEM Part Numbers	UF550, 22448JA10A, 22448JA10C, 22448JA11C, 22448JA12D
Application Examples	Altima, 350Z, Maxima, Murano, Pathfinder, Q50, QX60, FX35, EX35, G35
Plug Type	Iridium spark plugs

Our Verdict

The ECCPP UF550 six-coil and six-plug kit is a pragmatic, cost-effective option for owners needing a full ignition bank refresh on compatible Nissan and Infiniti 3.5L engines. It offers OE-referenced fitment and improved ignition energy that typically restores smooth idle and reduces misfires, but potential buyers should be mindful of mixed reports about durability and consider warranty expectations.

Frequently Asked Questions

Will this kit fit my Q50 3.5L?
It is listed as compatible with Q50 model years 2014-2018 with the 3.5L V6, but always verify with your VIN or service manual before purchase.

Should I replace coils and plugs together?
Yes. Replacing coils and plugs together reduces the chance of leftover failing coils causing new plugs to misfire and gives the best cold-start and idle performance.

Are these the same as OEM coils?
They are aftermarket parts designed to meet or exceed OE specifications and replace common OEM numbers such as UF550 and 22448JA10C, but long-term durability may vary compared with factory parts.