ENA Ignition Coil Pack Set of 6 for Chevy GMC Isuzu 2.8L-4.2L UF303 — Direct-Fit, 12V Plug-and-Play

ENA set of 6 ignition coil packs (replace# UF303) is a direct-fit, plug-and-play replacement designed to restore consistent spark for compatible 2.8L–4.2L GM and Isuzu engines.

These ENA coil packs are engineered to match OE fitment and electrical specs for many Chevrolet, GMC, Isuzu, Hummer, Buick and Saab models from the early-2000s. Sold as a complete set of six, the coils include mounting hardware features and a 12‑month warranty, making them a practical option for mechanics and DIYers who need a full-bank replacement. They support L4, L5 and L6 engines in common applications like the Trailblazer, Envoy, Colorado, Canyon, Rainier, Ascender, H3 and 9-7x.

Which vehicles and engines will these ENA coils fit?

The ENA UF303 coil pack set covers a broad range of GM- and Isuzu-based vehicles from roughly 2002–2008. Fitment includes 2.8L, 2.9L, 3.5L, 3.7L and 4.2L engines across Chevrolet Trailblazer/EXT, GMC Envoy/XL/XUV, Colorado/Canyon, Buick Rainier, Hummer H3, Isuzu Ascender, i-280/i-290/i-350/i-370, Oldsmobile Bravada and Saab 9-7x.

• Covers L4, L5 and L6 engines (2.8L–4.2L) in specified model years.
• Commonly replaces OE numbers such as 12568062, 19300921, 19418994 and UF303.
• Intended for model years listed: 2002–2008 depending on vehicle.

How easy is installation and what are the electrical specs?

ENA coil packs are built with a plug-and-play approach to match OE connectors and mounting points so you can swap the set without modifying wiring or engine components. They run at standard 12V vehicle systems and attach with bolt-on mounts at the front of the engine as original equipment does.

• Plug-and-play electrical connectors for direct replacement.
• Bolt-on mount type with three terminal connections per coil.
• 12‑volt compatible and designed to replicate factory spark output characteristics.

What performance and reliability features should I expect?

These coil packs are manufactured to deliver stable spark output and consistent ignition timing under normal driving conditions, helping reduce misfires and uneven idle when installed as a full set. They include reference cross-numbers for quality matching and are sold with a 12-month limited warranty for added peace of mind.

• Engineered for consistent spark and reliable ignition across cylinders.
• Cross-referenced part numbers (UF303, 028310, 12568062, etc.) for accurate selection.
• One-year warranty with a full set of six coils in the package.

When should I replace all six coils rather than one?

Replacing the entire bank of coils is recommended when multiple cylinders show misfires, the vehicle has high mileage, or if several coils fail close together. A full-bank replacement restores uniform performance and avoids repeat labor costs when adjacent coils begin to degrade.

• Replace all when more than one cylinder misfires or after visible coil damage.
• Avoid staggered replacements to maintain uniform spark and diagnostic clarity.
• Cost-effective if your vehicle has high mileage or previous intermittent ignition issues.

Who is this for: The ENA set of 6 ignition coil packs is aimed at owners and technicians working on early‑2000s GM and Isuzu vehicles who need a reliable, direct-fit coil bank replacement. It suits DIY mechanics who prefer plug-and-play parts and shops performing full-bank ignition repairs for Trailblazer, Envoy, Colorado, Canyon, Rainier, Ascender, H3, 9-7x and related models that use UF303-style coils.