Ignition Coil & Iridium Spark Plugs for Kia Optima (2010-2016) 2.4L I4

Direct-Fit Ignition Coils & Iridium Spark Plugs for 2010-2016 Kia Optima

Replaces degrading factory ignition coils and standard plugs with high-output copper-core coils and iridium-tipped spark plugs to restore combustion efficiency and eliminate misfires.

The Stock Optima Theta II Ignition Shortcomings

The factory Kia ignition coils on the 2.4L Theta II engine are notoriously prone to thermal degradation over time. As mileage increases, constant heat cycling within the engine bay breaks down the internal epoxy and secondary windings. This heat soak leads to increased electrical resistance, causing weak spark delivery, rough idling, hesitation under load, and eventual P0300-series misfire codes. Furthermore, standard OEM spark plugs degrade, widening the spark gap and forcing the ignition coils to work harder, accelerating premature failure across the entire ignition system.

The Engineering Solution

This kit resolves thermal breakdown by utilizing superior OE+ grade ignition coils engineered with highly durable internal copper wiring. The upgraded copper windings drastically reduce internal resistance and improve thermal conductivity, ensuring consistent 12V voltage output even under heavy engine load and extreme operating temperatures. Paired with LFR5AIX-11 equivalent iridium spark plugs, the system delivers a more focused, hotter spark. The fine-wire iridium center electrode requires less firing voltage and resists spark erosion far better than traditional copper or platinum plugs. This optimized spark event improves complete fuel burn in the combustion chamber, resulting in a reported 15% increase in energy transfer efficiency, smoother idle, and immediately restored throttle response.

Technical Specifications

Compatibility

• 2010 Kia Optima 2.4L I4
• 2011 Kia Optima 2.4L I4
• 2012 Kia Optima 2.4L I4
• 2013 Kia Optima 2.4L I4
• 2014 Kia Optima 2.4L I4
• 2015 Kia Optima 2.4L I4
• 2016 Kia Optima Hybrid 2.4L I4 (TF Chassis)

The Kia Dependability Standard

For daily-driven Korean sedans, maintaining precise ignition timing and a robust spark is critical to preventing costly catalytic converter damage from unburned fuel, keeping your dashboard CEL-free.

Common Questions

Will this ignition coil and spark plug kit fit my 2010-2016 Kia Optima 2.4L?
Yes, this kit is a direct fit for the 2010 Kia Optima 2.4L (MG chassis), 2011-2015 Kia Optima 2.4L (TF chassis), and 2011-2016 Kia Optima Hybrid 2.4L (TF chassis) using OEM coil 27300-3F100 (UF611).

Does this kit fit the 2016 Kia Optima 2.4L non-Hybrid JF chassis?
This kit is built specifically for 2.4L models equipped with UF611 (27300-3F100) coils and LFR5AIX-11 plugs, such as the 2016 Hybrid TF chassis, while the redesigned 2016 non-Hybrid JF chassis GDI uses UF764 coils and 12mm thread LKR7DIX-11S plugs.

What is included in this ignition tune-up kit?
The package includes high-output copper-core ignition coils (UF611 / 27300-3F100 spec) paired with fine-wire LFR5AIX-11 equivalent iridium-tipped spark plugs.

What factory part numbers does this kit replace?
The ignition coils and spark plugs replace part numbers UF611, 27300-3F100, 5C1724, IC712, and LFR5AIX-11.

Do these coils and plugs require any wiring modifications to install?
Installation is a direct plug-and-play swap into the factory 2.4L Theta II mounting locations and 12V electrical connectors with no modifications required.