Denso 5338 Spark Plug

Denso Iridium Power Spark Plug 5338

Denso Iridium Power 5338 is a performance spark plug built for precise ignition response and stable combustion. It uses a 0.4 mm iridium center electrode, a tapered seat, and a Tapercut/U-Groove ground design to support efficient spark delivery in a wide range of Ford, Chevrolet, GMC, Mazda, Buick, and Lincoln applications.

The Iridium Power line focuses on compact electrode design and durable materials for drivers looking for a sharper ignition upgrade. This plug is a direct-fit option for many vehicles, including Ford Escape, Chevrolet Colorado, and GMC Canyon applications listed in the fitment data.

Key Features

• Part number 5338 from Denso Iridium Power
• 0.4 mm iridium center electrode for focused spark initiation
• Tapercut and U-Groove ground electrode tip design
• Nickel ground electrode core with copper center electrode core
• 5000 ohm resistance
• Pre-gapped to 1.1 mm
• Tapered seat, 14.00 mm thread diameter, 25.00 mm reach
• 16.0 mm hex size and heat range 16

Product Details

Denso engineered this spark plug for vehicles that call for an iridium plug with a tapered seat and a 14 mm thread. The small iridium center electrode helps concentrate the spark, while the tapered U-Groove ground design supports consistent ignition performance. With a copper core center electrode and nickel ground core, this plug is built around efficient heat transfer and dependable operation in everyday driving and performance-focused use.

This part cross-references DENSO Auto Parts ITV16 for the same application. It is listed across multiple fitments, including 2020-2022 Ford Escape, 2021-2022 GMC Canyon, and 2017-2020 Ford Fusion applications.

What It Helps Address

• Rough idle caused by worn spark plugs
• Hard starting from weak ignition output
• Misfire conditions tied to degraded plug electrodes
• Reduced throttle response from inconsistent spark delivery
• Maintenance replacement for high-mileage ignition systems

Installation Notes and Tips

Verify the engine’s required thread diameter, reach, seat type, and heat range before installation. Confirm the gap specification against the vehicle service information, even though this plug is pre-gapped to 1.1 mm. Use proper spark plug removal and torque procedures to protect the cylinder head and ensure correct sealing on tapered-seat applications.

Fitment includes many direct applications such as 2023 Ford Escape, 2023 Lincoln Corsair, 2021-2022 Chevrolet Colorado, 2021-2022 GMC Canyon, 2018-2019 Chevrolet Impala, and 2013-2017 Buick Regal. Additional coverage extends across 1995-2023 model years in the listed applications.

Quality Assurance

Denso Iridium Power spark plugs are built to OE-style dimensional standards and application-specific specifications for the vehicles listed in the fitment data. Part number 5338 is designed around Denso’s iridium electrode technology and published interchange references for accurate replacement selection.