Autolite 25 Spark Plug

Reliable Ignition with Autolite Copper Resistor Spark Plug

The Autolite Copper Resistor Spark Plug Part Number 25 is engineered to provide consistent ignition performance for a wide range of vehicles including Chevrolet, Ford, and Pontiac models. Designed with durable materials and precise specifications, this spark plug supports efficient engine operation and reliable starts.

• Resistance: 4000 ohms for effective electrical noise suppression
• Tapered ground electrode tip and seat for optimal spark delivery
• Copper center electrode core with nickel tip for enhanced conductivity and durability
• Stud-type electrical terminal for secure connection
• Ceramic mid-projection insulator for heat resistance and insulation
• Pre-gap size of 0.044 inches (1.10 mm) for proper spark gap
• Thread diameter of 14.0 mm and reach of 0.431 inches (11.0 mm) for precise fitment
• Hex size 5/8 inch (16 mm) for standard installation tools

About the Copper Resistor Spark Plug Product Line

The Autolite Copper Resistor Spark Plug line combines copper core technology with resistor features to reduce electromagnetic interference while maintaining strong spark energy. This product line is designed to meet the ignition needs of various domestic vehicles, providing a balance of performance and durability. The resistor type spark plug helps protect sensitive electronic components in modern ignition systems.

Detailed Product Description

This Autolite spark plug features a copper core center electrode that enhances thermal conductivity and electrical performance. The nickel ground and center electrode tips provide wear resistance, extending service life. The tapered ground electrode tip and tapered seat design ensure efficient spark formation and combustion. With a resistance rating of 4000 ohms, this spark plug minimizes radio frequency interference, making it suitable for vehicles equipped with advanced electronics. The ceramic mid-projection insulator offers excellent heat dissipation and electrical insulation, supporting stable engine operation under various conditions.

Compatible Vehicles and Applications

• Designed for use in Chevrolet Camaro, Impala, and Blazer models
• Compatible with Ford F-150, Bronco, and Mustang vehicles
• Suitable for Pontiac Bonneville, Grand Prix, and Firebird
• Fits Buick Skylark, Century, and Regal
• Also compatible with GMC Sierra and Yukon models

Common Issues Addressed by This Spark Plug

• Engine misfires due to worn or fouled spark plugs
• Difficulty starting or rough idling in older ignition systems
• Radio frequency interference affecting vehicle electronics
• Reduced fuel efficiency from incomplete combustion
• Premature electrode wear impacting ignition reliability

Installation Notes and Tips

Ensure the spark plug gap is set to the specified pre-gap size of 0.044 inches (1.10 mm) before installation. Use a 5/8 inch (16 mm) socket wrench for proper tightening. Avoid over-torquing to prevent damage to the tapered seat and threads. Inspect the spark plug threads and cylinder head for cleanliness to ensure a secure fit. This spark plug is designed for vehicles with a 14.0 mm thread diameter and 0.431 inch (11.0 mm) reach.

Quality Assurance and Warranty

Autolite spark plugs are manufactured to meet industry standards for ignition components. The Copper Resistor Spark Plug line undergoes rigorous testing to ensure consistent resistance, electrode durability, and fitment accuracy. While specific warranty details are not provided, Autolite products typically adhere to OEM quality requirements for ignition parts.