Ignition Coil and Iridium Spark Plugs for Kia Sedona (2018-2020) 3.3L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2018-2020 Kia Sedona

What it Does: The ignition coil and iridium spark plug kit replaces failing factory ignition components on the 2018-2020 Kia Sedona to eliminate cylinder misfires, restore clean combustion, and stabilize idle quality.

The Stock Kia Sedona Thermal Breakdown and Misfire Tendency

In the YP chassis Sedona, the transverse-mounted 3.3L Lambda II GDI (G6DH) engine creates significant underhood heat soak, especially along the rear cylinder bank near the firewall. Factory coil packs suffer progressive dielectric breakdown as thermal cycling degrades the internal epoxy insulation and primary windings. This leads to secondary voltage leakage, erratic resistance spikes, and severe misfires under load (typically throwing DTCs P0300 through P0306). Simultaneously, standard spark plug electrodes erode rapidly under high-pressure direct injection, widening the gap and straining aged coils to the point of complete ignition failure.

The Engineering Solution

This direct replacement service kit includes six heavy-duty pencil coils and six laser-welded iridium spark plugs designed to withstand high-duty cycles. The coil housings use high-dielectric reinforced thermoplastic and premium copper wire windings potted in high-grade epoxy to prevent arcing and thermal degradation up to 140°C. Paired with 0.6mm fine-wire iridium center electrode plugs, the system requires lower discharge voltage to spark, producing a stable flame kernel that burns cleanly across direct-injection spray patterns while directly matching OEM 273103L000 and UF844 specifications.

Technical Specifications

Compatibility

• 2018 Kia Sedona (L, LX, EX, SX, SX Limited 3.3L V6)
• 2019 Kia Sedona (L, LX, EX, SX 3.3L V6)
• 2020 Kia Sedona (L, LX, EX, SX 3.3L V6)

Frequently Asked Questions

Does this fit the YP Sedona?
Yes, this kit is a direct bolt-in fit for all 2018-2020 Kia Sedona models equipped with the 3.3L Lambda II GDI engine.

Are the included iridium spark plugs pre-gapped?
Yes, the spark plugs come pre-gapped to factory specification (0.040–0.044 in) for immediate installation without manual re-gapping.

The Kia High-Mileage Caliber

Built for the continuous demands of passenger hauling and long-distance road trips, this ignition kit restores the factory-level combustion reliability and fuel efficiency required to keep your powertrain running smoothly without uncommanded engine check lights.