Champion 31 Spark Plug

Champion Copper Plus 31 Spark Plug

Champion Copper Plus 31 is a replacement spark plug built for dependable ignition performance and stable heat control. Its copper core electrode improves conductivity, while the nickel center and ground electrode materials support consistent wear characteristics in everyday driving.

Compatible With Chrysler, Dodge, and Plymouth applications that call for plug type RN14MC5 and a 0.050 in. gap, including Chrysler Town & Country, Dodge Caravan, and Plymouth Voyager fitments.

Key Features

• Copper core electrode for improved conductivity and heat management
• Nickel center electrode tip and nickel ground electrode core material
• Pre-gapped at 0.050 in. (1.28 mm)
• Resistor design for ignition system noise control
• Flat seat with 0.75 in. reach and 14 mm thread diameter
• Non-removable nut terminal and hex design for standard service tools
• Champion Copper Plus classification, part number 31

Product Details

Champion Copper Plus 31 is a conventional spark plug for secondary ignition service, engineered around a copper core for reliable conductivity and heat transfer. The nickel electrode construction supports steady spark delivery and wear control, while the resistor design helps maintain clean ignition performance in vehicles that specify this plug style. This part number 31 spark plug matches applications that use RN14MC5 and a 0.050 in. gap, making it a direct service option for many Chrysler, Dodge, and Plymouth models.

This part cross-references Autolite 646 and Anchor 3015 for the same application.

Common Uses

• Rough idle caused by worn spark plugs
• Hard starting from weak or inconsistent spark
• Misfire conditions tied to plug wear or incorrect gap
• Reduced throttle response from degraded ignition performance
• Maintenance replacement on Chrysler, Dodge, and Plymouth engines using RN14MC5

Installation Notes

• Verify the engine calls for plug type RN14MC5 before installation.
• Confirm the gap is set to 0.050 in. if adjustment is needed.
• Use the correct socket size for the 14 mm thread and hex design.
• Check the seat type and reach against the original plug specification.
• Fits 1990-1995 Dodge Caravan, N/A; Gap 0.050 (in); Plug Type Number RN14MC5; Copper Plus.
• Fits 1995-2000 Chrysler Town & Country, N/A; Gap 0.050 (in); Plug Type Number RN14MC5; Copper Plus.
• Fits 1991-1994 Plymouth Voyager, N/A; OE Type; Gap 0.050 (in); Plug Type Number RN14MC5; Copper Plus.

Quality Assurance

Champion Copper Plus spark plugs are built to meet the specifications listed for the application, including heat range 14, resistor construction, and the stated gap and thread dimensions. Part number 31 is cataloged for direct-fit service on confirmed Chrysler, Dodge, and Plymouth applications.