Denso 3423 Spark Plug

Denso Iridium Long Life Spark Plug 3423

The Denso 3423 Iridium Long Life spark plug is built for precise ignition performance in select Isuzu applications. It uses an iridium center electrode, copper core, and a platinum chip ground electrode tip to support consistent spark delivery and long service life.

Compatible with 2004 Isuzu Axiom and 2004 Isuzu Rodeo, this spark plug is engineered to meet strict OE performance, durability, and emissions standards. The Denso Iridium Long Life line focuses on stable ignition characteristics and dependable operation for daily driving.

Key Features

• Part number 3423 for select 2004 Isuzu Axiom and Rodeo applications
• Iridium center electrode tip material for precise ignition performance
• Platinum chip ground electrode tip design for durable spark delivery
• Copper center electrode core and nickel ground electrode core
• 0.9 pre-gap size for OE-style setup
• 5000 ohm resistance for ignition system compatibility
• Flat seat design with 12.00 mm thread diameter and 26.50 mm reach
• 16.0 mm hex size and manufacturer heat range 16

Product Details

Denso Iridium Long Life spark plugs are built for drivers who want OE-level fit and ignition consistency. The 3423 spark plug combines an iridium firing tip with a platinum chip ground electrode design to help maintain stable combustion characteristics under normal engine operating conditions. For shoppers searching for a 2004 Isuzu Axiom spark plug or a 2004 Isuzu Rodeo spark plug, this part number 3423 is the direct application match listed here.

This part cross-references DENSO Auto Parts SXU16HPR-9 and Isuzu 8-97311-393-0 for the same application.

What It Helps Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition output
• Misfire conditions related to degraded spark plugs
• Reduced throttle response from weak spark delivery
• Maintenance replacement for OE-style ignition service

Installation Notes and Tips

Verify the engine application before installation and confirm the plug gap matches the specified 0.9 setting. Use the correct 16.0 mm spark plug socket and follow the vehicle service manual for torque and removal procedures. Inspect ignition coils, boots, and plug wells during service to ensure the new plug performs as intended.

Quality Assurance

Denso manufactures this spark plug to strict OE performance, durability, and emissions standards. The Iridium Long Life product line is built for consistent ignition service in factory-style applications.