ECCPP Ignition Coil and Iridium Spark Plug Kit for Buick Regal & Cadillac ATS - UF680/94489, Set of 4 for Improved Start & Idle

The ECCPP UF680 & 94489 kit is a four-cylinder ignition coil and iridium spark plug set designed to restore reliable spark and smoother engine performance for compatible Buick and Cadillac models.

This complete replacement kit bundles four ignition coils with four iridium-tipped spark plugs engineered to meet or exceed original equipment specifications. It’s intended for vehicles such as the Buick Regal (2014–2018 variants) and Cadillac ATS (2013–2016) that use the UF680/94489 OEM fitment numbers. Each component combines corrosion-resistant materials and high-dielectric epoxy to deliver consistent spark delivery and long service life.

How will these coils and plugs affect engine starting and idle?

Replacing worn coils and spark plugs from a matched kit helps restore reliable cold starts and steadier idle by delivering consistent ignition energy to each cylinder. The iridium plugs require less voltage to ignite the air–fuel mixture, while the upgraded coils provide a stronger, more stable spark.

• Restores reliable cold starts and smoother low-RPM idle
• Reduces misfires and hesitation under light load
• Designed to match factory timing and firing requirements

Will this kit improve fuel economy or reduce engine warnings?

While outcomes vary by vehicle condition, fresh coils and iridium plugs can help reduce misfire-related fuel waste and lower the chance of check-engine warnings tied to ignition faults. They don’t change engine tuning but can return fuel use closer to factory levels if ignition degradation was present.

• Helps prevent misfire codes caused by weak spark
• Can reduce fuel loss from incomplete combustion
• Compatible with OEM sensors and onboard diagnostics

What build quality and materials are used in this ECCPP kit?

The set uses high-conductivity copper windings inside coils, high-dielectric epoxy potting for insulation, and iridium-tipped spark plugs for durability and consistent spark performance. Corrosion-resistant connectors and precision terminals aim to mirror OE fit and electrical connectivity for long-term reliability.

• High-conductive copper core and epoxy encapsulation in coils
• Iridium center electrode for longer plug life and stable spark
• Corrosion-resistant electrical connectors and exact-fit terminals

How do I know this set fits my vehicle?

This kit is made to replace OEM part numbers including UF680 and 94489 and lists compatibility for specific Buick Regal and Cadillac ATS model years with 2.0L or 2.5L L4 engines. Always cross-check with your vehicle’s OEM part numbers or VIN parts lookup before purchase to confirm fitment.

• Replaces OEM numbers like UF680, 12652405, 12654078, 12687140, and others
• Specified for Buick Regal 2014–2018 and Cadillac ATS 2013–2016 2.0L/2.5L L4 variants
• Verify with shop manual or VIN-based parts search for final confirmation

Who is this for: Drivers and independent mechanics who need a single, matched ignition solution for a four-cylinder Buick Regal or Cadillac ATS seeking to address misfires, rough idle, hard starts, or to perform routine ignition maintenance. The ECCPP kit is aimed at owners who prefer aftermarket parts built to factory tolerances, offering an affordable route to restore engine smoothness without reprogramming or additional tuning.