Champion 991 Spark Plug

Reliable Ignition Performance for Acura, Honda, Toyota, and More

The Champion Copper Plus 991 spark plug is engineered to deliver consistent ignition and efficient combustion for a wide range of vehicles including Acura, Honda, Toyota, Nissan, and Subaru models. Designed with durable nickel electrodes and a resistor to reduce electrical noise, this spark plug supports smooth engine operation and reliable starts.

• Ground electrode core made of nickel for durability
• Nickel center electrode tip for consistent spark
• Pre-gapped to 0.035 inches (0.90 mm) for optimal ignition
• Flat seat type with 1.043 inch reach and 12 mm thread diameter
• Non-removable nut electrical terminal type
• Includes resistor to minimize radio frequency interference
• Heat range rating of 8 suitable for small engine applications
• Hex size 14 mm for standard installation tools

Detailed Features of Champion Copper Plus 991 Spark Plug

The Champion Copper Plus line is designed to provide dependable ignition performance with copper core technology that enhances conductivity and heat dissipation. The 991 spark plug features a nickel ground electrode and center electrode tip, which offer a balance of durability and reliable spark generation. Its flat seat design and precise 1.043 inch reach ensure proper fitment in compatible engines. The resistor built into the plug helps reduce electrical interference, making it suitable for vehicles with sensitive electronics. The pre-gap size of 0.035 inches (0.90 mm) is factory set to optimize combustion efficiency and reduce misfires.

Compatible Vehicles and Applications

This spark plug is compatible with a variety of makes and models, including but not limited to Acura TLX, Honda Accord, Civic, CR-V, Toyota Corolla, Camry, and Subaru Forester. It is also suitable for Nissan Altima, Maxima, and Rogue, as well as Lexus and Infiniti models. The Champion Copper Plus 991 is designed for secondary ignition systems in these vehicles, supporting smooth engine starts and consistent performance.

• Resolves engine misfires and rough idling
• Improves cold start reliability
• Reduces radio frequency interference affecting vehicle electronics
• Helps maintain fuel efficiency by ensuring proper combustion
• Prevents electrode wear and extends spark plug life

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.035 inches (0.90 mm) as specified. Use a 14 mm socket wrench to install the plug, ensuring the flat seat properly contacts the cylinder head. Torque the spark plug to the vehicle manufacturer’s specifications to avoid damage. The non-removable nut terminal type requires compatible ignition wires or boots. Always inspect the ignition system components for wear or damage during replacement.

Quality Assurance and Warranty

Champion Copper Plus spark plugs are manufactured to meet OEM standards for fit, form, and function. The 991 spark plug undergoes rigorous quality control to ensure consistent performance and durability. While specific warranty details may vary, Champion products typically include coverage against manufacturing defects. Consult product documentation or authorized sources for warranty terms.