Denso 3116 Spark Plug

Denso Double Platinum Spark Plug 3116

Denso Double Platinum spark plug 3116 is built for OE-level performance, durability, and emissions control in a wide range of Honda, Dodge, and Mitsubishi applications. It uses a platinum chip ground electrode, a platinum center electrode tip, and a copper core center electrode to support stable ignition performance in older import engines.

Key Features

• Double Platinum design with platinum on the center electrode tip and platinum chip ground electrode tip
• 5000 ohm resistor for ignition noise suppression
• Standard ground configuration with one ground electrode
• Nickel ground electrode core material and copper center electrode core material
• Pre-gapped to 1.1 mm
• 14.00 mm thread diameter, 19.00 mm reach, 20.6 mm hex size, flat seat
• Manufacturer heat range 20

Product Details

Part number 3116 is part of Denso Double Platinum line, a spark plug family focused on OE-style fit, consistent combustion, and long-term service in secondary ignition systems. This plug is specified for applications including 1975-1983 Honda Civic, 1981-1983 Honda Accord, 1983 Honda Prelude, 1983-1988 Mitsubishi Cordia, 1983-1988 Mitsubishi Tredia, 1983-1989 Mitsubishi Starion, 1981-1988 Dodge Colt, and 1984-1989 Dodge Ram 50. It also cross-references DENSO Auto Parts P20PR-S11 for the same application.

Common Uses

• Engine misfire caused by worn or fouled spark plugs
• Hard starting and inconsistent cold-start ignition
• Rough idle and hesitation under acceleration
• Reduced combustion efficiency from aged secondary ignition components
• Ignition noise concerns in resistor-equipped systems

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. Confirm the gap specification matches the engine requirement, and inspect ignition wires, distributor components, and coil condition at the same time. For fitment, use the exact vehicle listing: Fits 1975-1983 Honda Civic, N/A; Fits 1981-1983 Honda Accord, N/A; Fits 1983 Honda Prelude, N/A; Fits 1983-1988 Mitsubishi Cordia, N/A; Fits 1983-1988 Mitsubishi Tredia, N/A; Fits 1983-1989 Mitsubishi Starion, N/A; Fits 1981-1988 Dodge Colt, N/A; Fits 1984-1989 Dodge Ram 50, N/A.

Quality Assurance

Denso manufactures this spark plug to meet strict OE performance, durability, and emissions standards. The Double Platinum construction supports consistent service in applications that call for a factory-style replacement spark plug.