MAS Ignition Coil Pack UF303 / E255 Replacement for Chevy & GMC 2.8L–4.2L Engines — OE Fit, 1-Year Warranty

This MAS coil pack replaces worn or failed ignition coils on a long list of GM and Isuzu models, including Chevy Trailblazer, Colorado, Buick Rainier, GMC Canyon, Hummer H3, Envoy, Saab, Oldsmobile and select Isuzu and Saab vehicles. Built to match OE fitment and electrical specifications, the UF303/E255 unit is offered with a one-year warranty and cross-references many OEM and aftermarket numbers to simplify parts matching.

Will this coil pack fit my vehicle?

Compatibility depends on engine type and model year—this MAS UF303/E255 is intended for 4-cylinder 2.8L, 5-cylinder 3.5L and 3.7L, and 6-cylinder 4.2L engine families listed by maker. Use your vehicle year/make/model selector or compare the part cross-reference list to confirm fitment before purchase.

• Fits Chevy Trailblazer EXT, Colorado; GMC Canyon, Envoy; Buick Rainier; Hummer H3; Isuzu i-280; Saab and select Oldsmobile models
• Engine families covered: L4 2.8L, L5 3.5L & 3.7L, L6 4.2L
• Cross-references: UF-303, E255, IC414, 12568062, 19300921 and many OEM numbers

How will replacing the ignition coil pack affect drivability?

Installing a fresh MAS coil pack can eliminate symptoms caused by weak or intermittent spark, improving start-up reliability and smoothing engine performance. It can also reduce misfires and the conditions that lead to poor fuel economy and catalytic converter stress.

• Reduces hard/no-start and long-crank situations
• Lowers misfire rates and rough idle occurrences
• Helps restore consistent power delivery and transmission shift quality

What should I check to prolong coil life?

Coils endure extra stress when working with worn spark plugs or poor ignition components. Regularly inspect spark plugs, plug wires (if used), and ignition boots; replace aged parts to avoid overloading the new coils and to maintain long-term reliability.

• Replace spark plugs according to manufacturer interval
• Inspect for oil, coolant, or debris that can damage coil boots
• Address engine misfires and vacuum leaks promptly to prevent coil overheating

What warranty and quality assurances are included?

This MAS coil pack set comes with a one-year warranty covering manufacturing defects. If the coil fails within the warranty period, contact the seller for replacement service to minimize downtime and repair cost.

• One-year limited warranty included
• Manufactured to meet fit and electrical specifications of listed applications
• Supplied with full cross-reference numbers for easier parts verification

Who is this for: The MAS Ignition Coil Pack UF303 E255 is aimed at DIY mechanics, independent repair shops, and vehicle owners who need a reliable, direct-replacement ignition coil for GM and related engine platforms. It's a practical choice if your vehicle exhibits misfires, long cranking, a check-engine light for ignition faults, or if you’re replacing old coils as preventative maintenance.