Autolite 685 Spark Plug

Overview of Autolite Copper Resistor Spark Plug 685

The Autolite Copper Resistor Spark Plug 685 is engineered for reliable ignition performance in a range of Chevrolet and GMC vehicles. Designed with a copper core and resistor technology, this spark plug supports efficient combustion and reduced electrical interference.

• Resistance: 5000 ohms for noise suppression
• Ground Electrode Tip: Tapered nickel design
• Center Electrode Core: Copper with nickel tip
• Electrical Terminal Type: Stud
• Pre-Gap Size: 0.060 inches (1.50 mm)
• Hex Size: 5/8 inch (16 mm)
• Thread Diameter: 14.0 mm with 0.433 inch (11.0 mm) reach
• Seat Type: Tapered
• Insulator: Short ceramic type
• Single ground electrode

Detailed Product Description

The Autolite Copper Resistor Spark Plug 685 belongs to the Copper Resistor Spark Plug line, which combines copper core electrodes with resistor technology to reduce radio frequency interference and improve ignition stability. The copper center electrode core enhances thermal conductivity, promoting better heat dissipation and consistent spark delivery. The tapered nickel ground electrode tip and nickel center electrode tip provide durability and reliable spark gap maintenance. This spark plug features a stud-type electrical terminal and a short ceramic insulator designed for optimal insulation and heat resistance.

With a pre-gap size of 0.060 inches (1.50 mm), a 14.0 mm thread diameter, and an 11.0 mm reach, this spark plug is engineered to meet the specifications required by various Chevrolet and GMC models. The tapered seat ensures a secure fit and proper sealing within the combustion chamber.

Compatible Vehicles and Applications

This spark plug is compatible with a wide range of Chevrolet and GMC vehicles, including but not limited to:

• Chevrolet Bel Air, Camaro, Caprice, Corvette, El Camino, Impala, Malibu, Monte Carlo, Monza, Nova
• GMC C10, C10 Suburban, C20, C20 Suburban, C30, G10, G20, G30, Jimmy, K5 Blazer, K10, K10 Suburban, K20, K20 Suburban, P10, P20, P30

Common Issues Addressed by Autolite Spark Plug 685

• Misfires and rough idling due to worn or faulty spark plugs
• Reduced fuel efficiency caused by incomplete combustion
• Engine hesitation or poor acceleration
• Excessive electrical noise affecting vehicle electronics
• Difficulty starting the engine in cold conditions

Installation Notes and Tips

• Verify the correct gap of 0.060 inches (1.50 mm) before installation
• Use a 5/8 inch (16 mm) spark plug socket for proper torque application
• Ensure the tapered seat is clean and free of debris for proper sealing
• Apply anti-seize compound sparingly on threads if recommended by the vehicle manufacturer
• Torque to manufacturer specifications to avoid damage to the spark plug or cylinder head

Quality Assurance and Warranty

Autolite Copper Resistor Spark Plug 685 is manufactured to meet OEM standards for fit, form, and function. The use of high-quality materials such as copper and nickel ensures durability and consistent performance. While specific warranty details may vary, Autolite products typically come with a limited warranty against manufacturing defects. Consult vehicle or product documentation for exact warranty terms.