Ignition Coil & Iridium Spark Plugs for Cadillac CTS STS XTS (2008-2019) 3.0L 3.6L V6

Direct-Fit Ignition Coil & Iridium Spark Plugs for 2008-2019 Cadillac CTS, STS, XTS (LLT / LFX V6)

Restores factory ignition efficiency by replacing degraded OEM coils and fouled spark plugs to eliminate misfires and stabilize idle.

The Stock GM High Feature V6 Ignition Weakness

Factory ignition coils on the GM High Feature V6 (LLT and LFX) are notorious for premature thermal degradation. The tightly packaged engine bays of these Cadillac chassis expose the coil packs to extreme operating temperatures. Over time, this constant heat cycling deteriorates the internal epoxy and primary windings, leading to high electrical resistance and voltage leakage. Concurrently, factory spark plugs succumb to electrode wear, expanding the spark gap. This combination inevitably manifests as random cylinder misfires (P0300 codes), severe hesitation under heavy load, rough idling, and diminished fuel economy. Neglecting these symptoms puts excessive strain on the powertrain control module and catalysts.

The Engineering Solution

This comprehensive replacement kit integrates six precision-wound ignition coils with six advanced iridium-tipped spark plugs. The upgraded coils feature robust internal copper windings coated in high-temperature epoxy to effectively mitigate heat soak and resist electrical breakdown. Their molded silicone boots provide a superior dielectric seal against moisture and oil intrusion, which is critical for maintaining spark integrity in aging V6 engines. Paired with iridium spark plugs—which boast an ultra-fine center electrode—this system requires less firing voltage while delivering a more concentrated, consistent spark kernel. The high melting point of iridium ensures gap stability, providing complete combustion, restored throttle response, and a smooth idle sequence.

Technical Specifications

Compatibility

• 2008-2019 Cadillac CTS (3.0L & 3.6L V6)
• 2008-2011 Cadillac STS (3.6L V6)
• 2013-2019 Cadillac XTS (3.6L V6)

The Cadillac Precision Standard

Engineered to meet the exacting standards of luxury performance vehicles, ensuring smooth power delivery, optimal fuel atomization, and zero check engine lights (CEL) for your GM High Feature V6.