Autolite XP104 Spark Plug

Autolite Iridium Spark Plug XP104 Overview

The Autolite Iridium Spark Plug XP104 is engineered for reliable ignition performance in a wide range of vehicles including Buick, Chevrolet, Ford, and Mazda models. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Iridium center electrode tip for enhanced durability and ignition
• Taper cut ground electrode tip with platinum material for improved wear resistance
• Copper core center electrode with fine wire design for optimal conductivity
• Ceramic insulator material ensuring high dielectric strength
• Resistor type with 4000 ohms resistance to reduce electrical noise
• Metric thread size M14 x 1.25 with 5/8 inch hex size for secure fitment
• Pre-gapped at 0.05 inches (1.3 mm) for precise spark delivery
• Performance grade type with manufacturer heat range 9 for balanced heat dissipation

Iridium Spark Plug Product Line Details

The Autolite Iridium Spark Plug line focuses on delivering long-lasting ignition components that combine iridium and platinum materials for enhanced electrode life and stable spark performance. The XP104 model benefits from this technology by offering a fine wire iridium center electrode paired with a platinum ground electrode tip, which together improve ignition efficiency and reduce electrode erosion over time.

Technical Description and Features

The XP104 spark plug features a copper core center electrode that promotes excellent thermal conductivity, helping to maintain optimal operating temperatures. The taper cut ground electrode design, made from nickel with a platinum tip, ensures consistent spark gap integrity and durability. The ceramic insulator provides high resistance to heat and electrical stress, while the integrated resistor (4000 ohms) minimizes electromagnetic interference with vehicle electronics. The spark plug’s non-removable nut electrical terminal and mid-projection design support reliable installation and performance in compatible engines.

Compatible Vehicles and Applications

• Buick models including Century, LeSabre, and Skylark
• Chevrolet vehicles such as Camaro, Cavalier, and S10
• Ford trucks and SUVs including F-150, Explorer, and Ranger
• Mazda models like MPV and Tribute
• Additional fitment for Cadillac, GMC, Lincoln, Mercury, Oldsmobile, Pontiac, and others

Common Issues Addressed by XP104 Spark Plug

• Engine misfires and rough idling
• Reduced fuel efficiency due to incomplete combustion
• Difficulty starting the engine in cold conditions
• Loss of power and acceleration hesitation
• Excessive spark plug wear leading to ignition failure

Installation Notes and Tips

Ensure the spark plug gap is set to the pre-gap size of 0.05 inches (1.3 mm) before installation. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended specifications to avoid damage to the tapered seat. The M14 x 1.25 thread size and 5/8 inch hex size are standard for many compatible vehicles, but verify fitment with your specific model. Avoid using washers as this spark plug does not include one.

Quality Assurance and Warranty

Autolite manufactures the XP104 spark plug to meet strict quality standards, utilizing durable materials such as iridium and platinum for extended service life. The performance grade and manufacturer heat range 9 ensure reliable operation under various driving conditions. While specific warranty details are not provided, Autolite products typically come with manufacturer-backed quality assurance to support customer confidence.