Denso 5340 Spark Plug

Denso Iridium Power Spark Plug 5340

The Denso Iridium Power 5340 spark plug is built for precise ignition performance in secondary ignition systems. It uses a 0.4 mm iridium center electrode to promote efficient spark delivery, along with a tapered seat and 0.8 mm pre-gap for OE-style fitment in confirmed applications.

Compatible With 2014-2015 Cadillac CTS and 2014-2015 Cadillac XTS, this plug is a direct-fit option for drivers servicing the ignition system on these vehicles. The Denso Iridium Power line focuses on fine-wire electrode design and stable electrical resistance for consistent combustion control.

Key Features

• Part number 5340 from Denso Iridium Power
• 0.4 mm iridium center electrode for fine-wire spark delivery
• Tapercut and U-groove ground electrode tip design
• Nickel ground electrode core with copper center electrode core
• 5000 ohm resistance
• 0.8 mm pre-gap size
• 14.0 mm thread diameter, 25.0 mm reach, tapered seat
• 16.0 mm hex size for service access

Product Details

Denso Iridium Power spark plugs are engineered around a small-diameter iridium center electrode to support efficient ignition performance and stable spark formation. The 5340 uses a tapered seat, standard ground configuration, and a single ground electrode with a tapercut and U-groove tip design. These construction details matter when replacing worn plugs in vehicles that require the correct heat range, thread size, reach, and seat style for proper cylinder head sealing and ignition consistency.

This part cross-references DENSO Auto Parts ITV22 and General Motors 12642791 for the same application. It is a strong match for owners searching for a Denso 5340 spark plug for 2014-2015 Cadillac CTS or a Denso 5340 spark plug for 2014-2015 Cadillac XTS.

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition output
• Misfire conditions related to plug wear or gap degradation
• Reduced throttle response from weakened spark delivery
• Service replacement needs on high-mileage ignition systems

Installation Notes and Tips

Verify the engine’s required thread diameter, reach, seat type, and heat range before installation. Check the pre-gap against the vehicle specification and inspect coil boots, plug wells, and ignition components for wear before fitting the new plug. Use proper spark plug service procedures to avoid cross-threading the tapered seat and to maintain correct torque during installation.

Quality Assurance

Denso Iridium Power plugs are built with an iridium center electrode and OE-style dimensional specifications for confirmed applications. For 2014-2015 Cadillac CTS and 2014-2015 Cadillac XTS service, the 5340 provides a specification-driven replacement option backed by Denso’s ignition component engineering.