Denso 3018 Spark Plug

Denso 3018 Spark Plug Overview

The Denso 3018 is a conventional spark plug built for reliable secondary ignition performance in older gasoline engines. Its U-Groove electrode design helps improve ignitability and supports more efficient combustion, making it a direct-fit choice for select applications such as the 1985-1986 Jeep Grand Wagoneer.

Denso U-Groove Conventional spark plugs are engineered around practical OE-style construction, with a copper core center electrode, nickel tip materials, and a standard ground configuration. For buyers searching for a Denso 3018 spark plug, this part combines a flat seat, 14 mm thread diameter, 19.00 mm reach, and 0.8 pre-gap size for the specified application.

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 heat transfer
• Nickel center and ground electrode tip materials
• Flat seat design with 14 mm thread diameter
• 19.00 mm reach and 0.8 pre-gap size
• Compatible With 1985-1986 Jeep Grand Wagoneer, N/A

Product Details

The Denso U-Groove Conventional line focuses on dependable ignition performance using a shaped ground electrode that exposes the spark more effectively than a standard flat design. In this application, the Denso 3018 spark plug is specified for the 1985-1986 Jeep Grand Wagoneer and is also cross-referenced to American Motors J3189066 and DENSO Auto Parts W16EP-U for the same application. The part number 3018 is useful when matching service parts by catalog reference or OE-style interchange.

For shoppers comparing ignition tune-up parts for a Jeep Grand Wagoneer, the Denso 3018 offers the core dimensions and electrode materials needed for the listed fitment. The U-Groove design is intended to support stronger spark exposure, which can help maintain consistent combustion efficiency in the correct engine application.

What This Spark Plug Helps Address

• Hard starting caused by worn or inefficient spark plugs
• Misfire concerns related to weak ignition at the plug gap
• Rough idle from degraded secondary ignition performance
• Reduced combustion consistency in the specified engine application
• Service replacement needs for the 1985-1986 Jeep Grand Wagoneer

Installation Notes and Tips

Verify the thread diameter, reach, seat type, and pre-gap size against the vehicle service specification before installation. Use the correct torque procedure for the cylinder head material and inspect ignition wires, distributor components, and coil output at the same time to avoid repeat misfire concerns. Confirm the application by year, make, and model before ordering the Denso 3018.

Quality Assurance

Denso manufactures ignition components to OE-style standards, and the U-Groove Conventional design reflects a focus on consistent spark exposure and dependable service life in the specified application. This part is identified for direct use in the 1985-1986 Jeep Grand Wagoneer and carries the Denso 3018 part number for catalog matching.