Ignition Coil and Iridium Spark Plugs for Kia Optima (2017-2020) 2.0L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2017-2020 Kia Optima

What it Does: Restores direct secondary ignition voltage and optimal flame kernel propagation to eliminate engine misfires, rough idle, and spark blow-out under load.

The Stock Optima Dielectric Breakdown & Thermal Fatigue

Factory coil packs on the direct-injected 2.0L platform are subjected to severe engine bay thermal cycles, degrading internal epoxy potting over time. This insulation breakdown induces voltage leakage, carbon tracking along the boot, and erratic primary resistance. Coupled with standard plug electrode erosion that forces the coils to work harder across widened gaps, degraded ignition components lead to unburned hydrocarbons, hesitation during tip-in acceleration, and cylinder misfire trouble codes.

The Engineering Solution

This matched ignition service kit utilizes four heavy-duty coil-on-plug assemblies engineered with high-purity internal copper windings and reinforced dielectric resin to prevent internal shorting under elevated cylinder pressures. Thermoplastic silicone boots isolate against moisture ingress and oil vapor contamination. Complementing the coils, the four fine-wire iridium spark plugs offer superior thermal threshold stability and minimal electrical resistance, requiring lower ionization voltage to produce a rapid, consistent spark discharge.

Technical Specifications

Compatibility

• 2017-2020 Kia Optima (2.0L 4-Cylinder Turbo / Non-Turbo Models)

The Kia Precision Caliber

Engineered to exact OEM connector and depth tolerances, this replacement ignition kit guarantees dependable combustion efficiency, stable warm-up cycles, and zero diagnostic check-engine lights.