Denso 3373 Spark Plug

Denso Iridium Long Life Spark Plug 3373

Denso 3373 is an Iridium Long Life spark plug built for OE-level performance, durability, and emissions control. It is a direct-fit ignition component for select Mitsubishi applications, including the Eclipse and Galant, with precise dimensions and electrode materials chosen for stable combustion.

Key Features

• Iridium center electrode tip for consistent spark performance
• Platinum chip ground electrode tip design for long service life
• Copper core center electrode and nickel ground electrode core
• 5000 ohm resistor for ignition noise suppression
• Pre-gapped to 0.8 mm for the specified application
• 14.00 mm thread diameter, 19.00 mm reach, and flat seat design
• 16.0 mm hex size for proper socket fitment

Product Line Details

Denso Iridium Long Life plugs are part of Denso’s premium ignition line, focused on maintaining OE-style fit, combustion stability, and durability over extended service intervals. This design uses an iridium firing tip with a platinum chip ground electrode to support reliable ignition performance in demanding daily driving conditions.

Detailed Description

Part number 3373 is engineered for select Mitsubishi vehicles and cross-references Denso Auto Parts SVK20RZ8 as well as Mitsubishi 1822A002 and MD378582 for the same application. It is compatible with 2006-2012 Mitsubishi Eclipse and 2008-2009 Mitsubishi Galant, making it a direct replacement choice for drivers servicing factory-style ignition systems. The specified heat range 20, 0.8 mm pre-gap, and OE-oriented construction help maintain consistent spark delivery and combustion efficiency.

What It Helps Address

• Misfires caused by worn or fouled spark plugs
• Hard starting from weakened ignition output
• Rough idle related to inconsistent spark quality
• Reduced fuel economy from inefficient combustion
• Emissions issues tied to degraded ignition performance

Installation Notes and Tips

Verify the engine application and match the plug’s thread diameter, reach, seat type, and heat range before installation. Use the correct 16.0 mm spark plug socket and follow the vehicle manufacturer’s torque specification. Inspect the ignition system and plug wells during service, and confirm the pre-gap matches the engine requirement before final installation.

Quality Assurance

Denso manufactures this spark plug to strict OE performance, durability, and emissions standards. For buyers searching Denso 3373, Mitsubishi Eclipse spark plug replacement, or Mitsubishi Galant iridium spark plug applications, this part is built to meet factory-style expectations for fit and function.