Ignition Coil and Iridium Spark Plugs for GMC Terrain (2018-2020) 1.5L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 2018-2020 GMC Terrain

Primary Function: Restores factory spark energy, stabilizes idle quality, and eliminates misfire conditions caused by degraded factory secondary ignition components on the 1.5L Turbo platform.

The Stock Terrain Secondary Ignition Breakdown

Under continuous turbo boost pressures and extreme engine bay thermal cycling, factory coil boots and internal primary windings degrade over time. The high-heat environment of the direct-injected LYX engine induces thermal breakdown in OEM epoxy and boot silicones, leading to dielectric punch-through, carbon tracking, and high-load misfires (P0300-P0304) under boost.

The Engineering Solution

This comprehensive tune-up kit features four heavy-duty coil-on-plug assemblies engineered with high-conductivity internal copper windings, thermal-resistant epoxy potting, and reinforced dielectric silicone boots to prevent voltage arcing. Matched with fine-wire iridium spark plugs, the package delivers lower required firing voltage, superior flame kernel expansion, and dependable combustion stability under high cylinder pressures.

Technical Specifications

Compatibility

• 2018 GMC Terrain (SL, SLE, SLT) 1.5L L4 Turbo Gas
• 2019 GMC Terrain (SL, SLE, SLT) 1.5L L4 Turbo Gas
• 2020 GMC Terrain (SL, SLE, SLT) 1.5L L4 Turbo Gas

The GMC Reliability Standard

Engineered for high-mileage crossover durability, this ignition kit resists thermal breakdown to preserve turbo throttle response, fuel efficiency, and smooth direct-injection power delivery across demanding daily driving conditions.