Denso 3049 Spark Plug

Denso 3049 U-Groove Spark Plug Overview

Denso 3049 is a conventional spark plug built for secondary ignition service in a wide range of older import vehicles. Its U-Groove electrode design is engineered to improve ignitability, helping the engine fire the air-fuel mixture more consistently for smoother operation and better engine efficiency.

This Denso U-Groove Conventional spark plug uses a copper core center electrode, nickel tip materials, and a standard ground configuration with a flat seat. The 1.1 pre-gap, 14.00 mm thread diameter, 19.00 mm reach, and 20.6 mm hex size make it a direct-service ignition component for many Hyundai, Mitsubishi, Subaru, Isuzu, Suzuki, Dodge, and Volkswagen applications.

Key Features

• U-Groove ground electrode tip design for improved ignitability
• Conventional spark plug construction for secondary ignition service
• Copper core center electrode for stable spark delivery
• Nickel center and ground electrode tip materials
• 5000 ohm resistance
• Flat seat design with 14.00 mm thread diameter and 19.00 mm reach
• Pre-gapped to 1.1 for specified applications
• Part number 3049 for ordering and cross-reference use

Product Details

Denso 3049 is part of the U-Groove Conventional line, a product line focused on dependable ignition performance for vehicles that use a traditional spark plug design. The U-shaped ground electrode helps expose more of the spark kernel to the air-fuel mixture, which supports more complete combustion in applications such as the Hyundai Sonata, Mitsubishi Eclipse, and Subaru Standard. This spark plug is also cross-referenced as Denso Auto Parts W20EPR-U11 for the same application.

Use Denso 3049 when servicing older import engines that call for a conventional plug with the listed heat range, reach, and thread specifications. It is a practical OE-style replacement for vehicles including Hyundai Elantra, Mitsubishi Galant, and Isuzu Trooper, where correct ignition geometry matters for consistent engine operation.

What It Helps Address

• Hard starting caused by worn or inefficient spark plugs
• Misfire conditions related to weak ignition output
• Rough idle from degraded electrode performance
• Reduced combustion efficiency from excessive plug wear
• Service replacement needs on older Hyundai, Mitsubishi, Subaru, and Isuzu engines

Installation Notes

Verify thread diameter, reach, seat type, heat range, and pre-gap before installation. Confirm the engine calls for a 14.00 mm, flat-seat spark plug with a 19.00 mm reach and 1.1 pre-gap. For fitment research, this part is listed for applications such as Fits 1989-1998 Hyundai Sonata, N/A; Fits 1990-1994 Mitsubishi Eclipse, N/A; Fits 1980-1987 Subaru Standard, N/A; and other listed import models. Always follow the vehicle service manual for torque and final gap verification.

Quality Assurance

Denso manufactures ignition components to OE-level specification standards, and the 3049 spark plug reflects that engineering approach with nickel and copper core construction, defined resistance, and application-specific dimensions. Part number 3049 is built for direct replacement use in the listed vehicles and engine families.