Denso 3047 Spark Plug

Denso 3047 U-Groove Spark Plug

The Denso 3047 is a conventional spark plug built for stable ignition performance in a wide range of older import and domestic applications. Its U-groove ground electrode design helps improve ignitability, supporting more efficient combustion in engines that call for this style of plug.

Compatible With select Mitsubishi Eclipse and Galant applications, as well as Volkswagen EuroVan, Golf, Jetta, Passat, and Porsche 924/928/944 fitments listed below. The Denso 3047 is also referenced by OE-style part numbers used across Chrysler, GM, Isuzu, Mazda, Mitsubishi, Porsche, Suzuki, Toyota, Volkswagen, and Volvo applications.

Key Features

• U-groove ground electrode design for improved spark exposure
• Conventional spark plug construction for original-style service replacement
• 5000 ohm resistor for ignition noise suppression
• Copper center electrode core for dependable heat transfer
• Nickel center and ground electrode tip materials
• Flat seat design with 14.00 mm thread diameter and 19.00 mm reach
• 0.8 pre-gap size and 20.6 hex size
• Manufacturer heat range 20

Product Details

Denso U-Groove Conventional spark plugs are engineered around the electrode shape rather than added complexity. The U-shaped ground electrode helps expose the spark kernel more effectively, which can support cleaner ignition in engines that were originally specified for this plug style. With a copper core center electrode and nickel tip materials, the Denso 3047 is built for consistent secondary ignition service in older Mitsubishi, Volkswagen, Porsche, Volvo, Mazda, Dodge, and Subaru applications.

This part cross-references DENSO Auto Parts W20EPR-U and Chrysler 4106 117 for the same application. Search terms such as Denso 3047 spark plug for 1990-1999 Mitsubishi Eclipse, Denso 3047 for 1991-1992 Volkswagen Jetta, and Denso 3047 for 1985-1991 Porsche 928 are commonly used by buyers matching OE-style ignition service parts.

Common Issues This Part Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark delivery
• Misfire conditions tied to aged secondary ignition components
• Reduced fuel efficiency from incomplete combustion
• Loss of throttle response from degraded plug performance

Installation Notes and Tips

Verify the thread diameter, reach, seat type, and heat range against the vehicle service specification before installation. The Denso 3047 uses a flat seat and 14.00 mm thread diameter, so correct torque and clean cylinder head threads are important for sealing and heat transfer. Check the pre-gap against the engine specification before use, and inspect ignition wires, coils, and distributor components at the same time to avoid repeat misfire concerns.

• Fits 1990-1999 Mitsubishi Eclipse, N/A
• Fits 1991-1992 Mitsubishi Galant, N/A
• Fits 1989 Mitsubishi Mirage, N/A
• Fits 1992-1994 Volkswagen EuroVan, N/A
• Fits 1990-1992 Volkswagen Corrado, N/A
• Fits 1991-1992 Volkswagen Golf, N/A
• Fits 1991-1992 Volkswagen Jetta, N/A
• Fits 1991-1992 Volkswagen Passat, N/A
• Fits 1985-1991 Porsche 928, N/A
• Fits 1987-1989 Porsche 944, N/A
• Fits 1987-1988 Porsche 924, N/A
• Fits 1980-1982 Porsche 924, N/A
• Fits 1985-1988 Volvo 740, N/A
• Fits 1984-1988 Volvo 760, N/A
• Fits 1985 Volvo 745, N/A
• Fits 1986-1987 Mazda 626, N/A
• Fits 1987-1992 Mazda B2200, N/A
• Fits 1971-1980 Dodge Colt, N/A
• Fits 1978-1979 Dodge Challenger, N/A
• Fits 1979-1980 Dodge D50, N/A
• Fits 1976-1979 Subaru Standard, N/A

Quality Assurance

Denso manufactures ignition components to OE-style specifications for direct replacement service. The 3047 follows the brand’s U-Groove Conventional design approach, with materials and dimensions selected to match listed applications and support reliable secondary ignition performance.