Denso 3437 Spark Plug

Denso Iridium Long Life Spark Plug 3437

Denso 3437 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, Chrysler, and Dodge applications, including Mitsubishi Lancer, Outlander, Eclipse, Chrysler Sebring, and Dodge Stratus models.

The Iridium Long Life line focuses on extended service life and stable ignition performance. For drivers searching for a Denso spark plug for Mitsubishi Lancer or a Denso 3437 replacement for Mitsubishi Eclipse applications, this plug matches the factory-style design and key dimensions used in the original ignition system.

Key Features

• Iridium center electrode tip for consistent spark delivery
• Copper center electrode core for efficient heat transfer
• Nickel ground electrode core material
• Standard ground electrode tip design and standard ground configuration
• 0.8 pre-gap size for OE-style setup
• 5000 ohm resistance for ignition system compatibility
• Flat seat design, 14.00 mm thread diameter, and 19.00 mm reach
• 16.0 mm hex size for proper service tool fitment

Detailed Description

Denso 3437 is engineered as an OE-style spark plug for vehicles that require a flat-seat, long-reach plug with an iridium firing tip. The iridium center electrode supports precise ignition performance, while the copper core and nickel ground electrode help manage heat and durability under normal engine operating conditions. This makes it a practical choice for routine maintenance on Mitsubishi Lancer, Mitsubishi Outlander, Mitsubishi Eclipse, Chrysler Sebring, and Dodge Stratus applications listed below.

This part cross-references DENSO Auto Parts K16PSR-B8 for the same application. It also cross-references Mitsubishi 1822A030 and MN163235 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Misfire conditions related to aged ignition components
• Reduced fuel economy from inefficient combustion
• Loss of throttle response from degraded plug performance

Installation Notes and Tips

Verify the plug’s 14.00 mm thread diameter, 19.00 mm reach, flat seat, and 16.0 mm hex size before installation. Confirm the specified 0.8 pre-gap against the vehicle service information and inspect ignition coils, boots, and plug wells during replacement. For fitment-based searches, this Denso 3437 spark plug is listed for 2009-2010 Mitsubishi Lancer, 2008-2010 Mitsubishi Outlander, 2004-2005 Chrysler Sebring, 2004-2005 Dodge Stratus, and 2000-2005 Mitsubishi Eclipse applications.

Quality Assurance

Denso states that this spark plug is manufactured to OE performance, durability, and emissions standards. The Iridium Long Life design reflects the brand’s focus on factory-style fit and consistent ignition service for the listed vehicles.