Ignition Coil and Iridium Spark Plugs for Chevrolet Blazer (2019-2021) 2.5L

High-Output Ignition Coil and Iridium Spark Plug Kit for 2019-2021 Chevrolet Blazer

Direct-fit ignition overhaul kit engineered to eliminate primary misfires, rough idle, and spark blowout in the GM 2.5L powertrain.

The Stock Blazer Ignition Breakdown

Factory coil packs on the GM Ecotec 2.5L suffer from dielectric breakdown caused by sustained underhood heat cycling and engine bay thermal load. Over time, internal epoxy insulation degrades, causing secondary voltage leakage, intermittent cylinder misfires under load, and carbon tracking along the spark plug boots. Paired with eroded factory plug gaps, this increased resistance stresses the powertrain control module (PCM) driver circuits and degrades combustion efficiency in direct-injected chambers.

The Engineering Solution

This complete ignition kit features four high-dielectric coil-on-plug assemblies built with high-purity copper primary and secondary windings for maximum energy transfer and rapid saturation. Reinforced thermoplastic housings resist high-temperature cracking, while precision blade terminals prevent signal resistance. Included fine-wire iridium spark plugs feature laser-welded center electrodes that resist thermal erosion, minimizing spark quench and ensuring consistent arc stability under high-compression operating parameters.

Technical Specifications

Compatibility

• 2019 Chevrolet Blazer 2.5L L4 (L, 1LT trims)
• 2020 Chevrolet Blazer 2.5L L4 (L, 1LT trims)
• 2021 Chevrolet Blazer 2.5L L4 (L, 1LT trims)

The Chevrolet Reliability Standard

Engineered to withstand daily crossover utility demands, this direct-fit ignition kit restores factory throttle response, ensures instant cold starts, and protects your catalytic converter from unburnt fuel contamination without triggering diagnostic trouble codes.