A-Premium Iridium Platinum Spark Plugs 4PCS for GM L4 1.4L (Buick Encore, Chevy Cruze/Sonic/Trax) — 0.044" Gap, 5kΩ Resistor

A-Premium 4PCS Iridium Platinum spark plugs deliver a precise 0.044-inch gap, iridium-tipped center electrodes, and OEM-compatible fit for Buick Encore and Chevrolet Cruze/Sonic/Trax L4 1.4L engines.

These four spark plugs are engineered to match common OEM reference numbers (91039, IFR7X7G, AI3922, XP3922, XS3922, 55576026, 55585517) and provide replacement-ready specifications for a range of GM turbocharged 1.4L four-cylinder engines. Built with iridium center tips and cores plus a 5,000-ohm resistor, they balance long service life with stable ignition behavior. The plugs come with a 5/8-inch hex, 0.75-inch reach and 14 mm thread diameter to ensure straightforward installation using standard tools.

Which vehicles do these spark plugs fit?

These plugs are selected to suit multiple GM compact vehicles that use the L4 1.4L engine. Fitment spans model years where the manufacturer specified iridium/platinum plugs with the same thread and reach dimensions. Always confirm your current plug reference or consult the vehicle’s manual before installation.

• Buick Encore: 2013–2021 with L4 1.4L engine
• Chevrolet Cruze: 2011–2015 and Cruze Limited 2016 with L4 1.4L
• Chevrolet Sonic: 2012–2020 with L4 1.4L
• Chevrolet Trax: 2013–2021 with L4 1.4L

How do these iridium platinum plugs affect performance and durability?

Iridium-tipped center electrodes are harder and more wear-resistant than conventional materials, which helps maintain a consistent spark over many miles. The platinum/iridium combination improves electrode longevity without requiring frequent replacements compared to copper plugs. However, benefits depend on proper installation, ignition system condition, and driving habits.

• Durable iridium center tip and core for extended service life
• Recommended replacement interval: 80,000–100,000 miles under typical use
• 5000-ohm resistor reduces radio-frequency interference and ignition noise
• Stable 0.044-inch gap promotes reliable combustion across operating ranges

What are the key technical specs I should know before buying?

Knowing the physical and electrical specs prevents fitment issues and ensures proper firing. These plugs are manufactured to specific dimensions so they thread correctly and seat at the designed reach and insulator height for the engine’s combustion chamber geometry.

• Center electrode tip/core material: iridium
• Resistance: 5000 ohms
• Gap size: 0.044 inches (factory preset)
• Hex size: 5/8 inch; insulator height: 53.00 mm; reach: 0.75 inch; thread diameter: 14.00 mm

Can I install these myself, and what should I watch for?

Yes — a mechanically inclined owner can replace spark plugs using basic tools, but it's important to follow torque specs and anti-seize recommendations if applicable. Inspect ignition coils and boots for wear, work with a clean workspace to avoid debris falling into cylinders, and verify the preset gap before fitting if you plan to reuse coils.

• Use a 5/8-inch socket and torque wrench for accurate tightening
• Check coil boots and wiring for cracks or corrosion before reassembly
• Keep the gap at 0.044 in or reset to the vehicle maker’s spec if needed
• Replace in small batches to maintain engine order and avoid mix-ups

Who is this for: This set is intended for owners and technicians servicing Buick Encore and Chevrolet Cruze/Sonic/Trax models equipped with the 1.4L four-cylinder engine who want a long-lasting, OEM-style iridium/platinum replacement. It's a good choice for drivers seeking reliable ignition performance, reduced maintenance frequency, and correct physical fitment without modifying the engine.