ECCPP UF491 Ignition Coils with 12578224 Iridium Spark Plugs Set of 4

In this review the ECCPP UF491 ignition coils bundled with 12578224 iridium spark plugs are evaluated for drivers who need a straightforward coil and plug replacement for a range of Buick, Chevrolet, GMC, Pontiac and Saturn 2.0L-2.4L engines. The bottom line: this kit is best for owners seeking an affordable, compatible replacement that restores ignition performance and can eliminate misfires and hesitation when the factory coil or plugs have aged. The review focuses on fitment, build quality, and real-world usefulness for common GM applications.

Key Features

• Wide Compatibility: Works with many Buick, Chevrolet, GMC, Pontiac and Saturn models covering multiple 2.0L, 2.2L and 2.4L engines so a single kit fits several common vehicles.
• OE Replacement Numbers: Replaces OEM part numbers UF491, 12578224, 12578244, 12589623 and 12629646 so it matches factory reference points for ease of ordering.
• Improved Energy Output: The coils claim about 15% more energy than OE coils, which helps stronger spark and can improve idle stability and throttle response on engines with worn ignition parts.
• Durable Construction: Built with high conductive copper wire and high dielectric epoxy to enhance reliability and resist corrosion at electrical connections for longer service life.
• Bundle Convenience: Sold as a set of 4 coils with matching iridium spark plugs so users can replace coils and plugs together for best cold-start and running performance.

Who It's For

This kit is aimed at DIYers and independent shops repairing misfire, rough idle or poor fuel economy on compatible Buick, Chevrolet, GMC, Pontiac and Saturn models from the mid 2000s through the mid 2010s with 2.0L to 2.4L engines. It suits owners who want an affordable replacement that follows OE references and will restore normal ignition performance without complicated modifications.

It is not for users who need model-specific OE branded parts for warranty reasons, or for vehicles outside the listed engine families; always verify fitment before purchase to avoid incorrect applications.

Pros & Cons

Pros

• Good replacement quality that many users report fixed misfires and restored smooth running.
• Comes as a matched set of coils and iridium plugs, simplifying a complete ignition service.
• Solid fitment for many GM models using the referenced OEM numbers.

Cons

• Some customers report mixed long-term durability, so results can vary by vehicle and operating conditions.

Specifications

Our Verdict

The ECCPP UF491 coil and iridium plug kit is a practical, cost-effective option for owners of compatible GM vehicles who need to cure misfire and return drivability without paying dealer prices. It offers clear fitment references, improved spark energy, and bundled plugs for a thorough service, though long-term durability can vary by use. For routine ignition replacement this kit delivers solid value.

Frequently Asked Questions

Will this kit fit my vehicle?
Check your vehicle year, make, model and engine against the listed compatibility and OEM numbers before ordering to ensure a correct fit.

Should I replace coils and plugs together?
Yes; replacing coils and spark plugs together helps ensure consistent spark and better cold-start and idle performance.

What warranty is included?
The kit includes a 12-month warranty; contact the seller if any parts fail within that period.