Ignition Coil and Iridium Spark Plugs for Kia Optima (2008-2009) 2.4L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2008-2009 Kia Optima

What it Does: Complete 4-cylinder ignition refresh kit engineered to replace degraded factory coils and fouled plugs, restoring precise spark timing, combustion efficiency, and smooth idle.

The Stock Optima Ignition Breakdown & Dielectric Fatigue

The Theta-series 2.4L engine operates under significant thermal cycling within the cylinder head recess. Over extended mileage, factory coil boots suffer dielectric breakdown, micro-fracturing the internal epoxy potting and causing secondary voltage leakage. Combined with widening spark plug gaps from electrode erosion, the stock ignition system experiences increased resistance, leading to intermittent misfires, hesitations under load, unburnt hydrocarbon build-up, and reduced fuel economy.

The Engineering Solution

This replacement ignition kit pairs high-dielectric coil-on-plug assemblies with durable iridium spark plugs. The ignition coils feature high-conductivity copper primary and secondary windings encased in thermal-resistant resin to prevent internal shorting under high engine-bay temperatures. Paired with fine-wire iridium center electrodes, this package provides consistent arc stability, lower voltage demand, and resistance to carbon fouling across all operating RPMs.

Technical Specifications

Compatibility

• 2008 Kia Optima 2.4L L4 (EX, LX)
• 2009 Kia Optima 2.4L L4 (EX, LX, SX)

The Kia Commuter Reliability Standard

Engineered for exact plug-and-play OE fitment, this kit eliminates check engine lights (CEL) related to cylinder misfires and restores factory throttle response without requiring ECU calibration or harness modifications.