Ignition Coil and Iridium Spark Plugs for Buick LaCrosse (2018-2019) 2.5L

Direct-Fit Ignition Service Kit for 2018-2019 Buick LaCrosse

Primary Function: Restores factory secondary ignition output and precise combustion timing on high-mileage Ecotec powertrains showing misfire codes or thermal breakdown.

The Stock LaCrosse Coil & Plug Breakdown

The 2.5L LHN Ecotec engine operates under tight engine bay packaging that traps radiant engine heat around the cylinder head. Over extended heat cycles, factory coil-on-plug boots develop micro-fissures and primary winding insulation degrades, inducing secondary voltage tracking and unmetered spark dropouts. Concurrently, aged factory plugs suffer from electrode erosion and widened gaps, which spikes the secondary voltage demand on the ignition coils and triggers sluggish throttle response, erratic idle, and P0300-P0304 fault codes.

The Engineering Solution

This comprehensive service pack replaces deteriorated components with heavy-duty coil-on-plug assemblies and matched iridium spark plugs. Each ignition coil features high-grade electrolytic copper primary and secondary windings wrapped around an engineered magnetic core, sealed with high-dielectric epoxy to resist high-temperature breakdown. Thermally stable silicone boots isolate high voltage to prevent flashover, while the fine-wire iridium spark plugs lower firing voltage requirements to ensure dependable, efficient arc generation across the entire operating RPM range.

Technical Specifications

Compatibility

• 2018 Buick LaCrosse Base, Preferred, Essence (2.5L L4 - Mild Hybrid LHN)
• 2019 Buick LaCrosse Base, Preferred, Essence (2.5L L4 - Mild Hybrid LHN)

The Buick Reliability Caliber

Precision calibrated to OE dwell parameters, this kit restores smooth, vibration-free idling and crisp transient throttle response while guaranteeing complete, error-free integration with onboard GM ECM control logic.