Denso 3422 Spark Plug

Denso Iridium Long Life Spark Plug 3422

The Denso 3422 spark plug is built for precise ignition performance in select Honda, Acura, Saturn, and GM applications. As part of the Iridium Long Life line, it uses an iridium center electrode and OE-focused construction to support stable combustion, consistent firing, and long service intervals.

Key Features

• Iridium center electrode tip for durable spark delivery
• Platinum chip ground electrode tip design for wear resistance
• 5000 ohm resistor helps control electrical noise
• Copper center core and nickel ground core for efficient heat transfer
• Flat seat design with 14.00 mm thread diameter and 19.00 mm reach
• Pre-gapped to 1.1 mm for OE-style application setup
• Manufactured to meet strict OE performance, durability, and emissions standards

Iridium Long Life Product Line

Denso Iridium Long Life spark plugs are engineered for drivers who want OE-style ignition performance with durable electrode materials. The 3422 follows that approach with an iridium firing tip and a platinum chip ground design, helping maintain consistent spark quality in demanding daily-driving conditions.

Detailed Description

Denso 3422 is a secondary ignition spark plug designed for direct replacement in select vehicles, including 2005-2010 Honda Odyssey, 2005-2008 Honda Pilot, 2006-2008 Honda Ridgeline, 2004-2007 Saturn Vue, and 2003-2006 Acura MDX. This part cross-references DENSO Auto Parts SKJ16DR-M11 and General Motors 12582002 for the same application. The 16.0 mm hex size, flat seat, and manufacturer heat range 16 support OE-style fitment where specified, while the iridium tip and copper core help promote reliable ignition performance.

Common Issues This Spark Plug Can Address

• Rough idle caused by worn ignition electrodes
• Hard starting from weakened spark output
• Misfire conditions related to plug wear or fouling
• Reduced fuel economy from inconsistent combustion
• Ignition noise concerns in OE-style electrical systems

Installation Notes and Tips

Verify engine application by year, make, and model before installation. Confirm the 14.00 mm thread diameter, 19.00 mm reach, flat seat, and 1.1 mm pre-gap match the original specification for your vehicle. Use proper spark plug service procedures, including torque settings and thread inspection, to help prevent cylinder head damage and ensure correct sealing.

Quality Assurance

Denso manufactures this spark plug to strict OE performance, durability, and emissions standards. The 3422 is built for direct-fit service in confirmed applications such as Honda Odyssey, Honda Pilot, and Acura MDX models listed above.