Autolite XP5243 Spark Plug

Autolite Iridium Spark Plug XP5243 Overview

The Autolite Iridium Spark Plug XP5243 is engineered for reliable ignition performance in a range of GM vehicles including Chevrolet, Cadillac, and GMC models. Designed with advanced materials and precise construction, 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 spark efficiency
• Copper core center electrode for optimal conductivity
• Ceramic insulator material for high heat resistance
• Resistor type with 4000 ohm resistance to reduce electrical noise
• Metric thread size M14 x 1.25 with 0.679 inch (17 mm) reach
• Non-removable nut electrical terminal type
• Performance grade with manufacturer heat range 10
• Single ground electrode with nickel core and platinum tip
• Tapered seat type and 5/8 inch hex size for secure fitment

Iridium Spark Plug Product Line Details

The Autolite Iridium Spark Plug line focuses on delivering consistent ignition performance through the use of iridium-tipped center electrodes. This design enhances electrode life and provides a stable spark under various operating conditions. The XP5243 model incorporates these features to meet the demands of performance-oriented vehicles, ensuring reliable starts and efficient fuel combustion.

Technical Description and Features

The XP5243 spark plug features a fine wire iridium center electrode that improves ignition reliability and longevity compared to conventional plugs. The copper core enhances electrical conductivity, while the platinum-tipped taper cut ground electrode optimizes spark exposure and wear resistance. The ceramic insulator withstands high temperatures, and the resistor design minimizes electromagnetic interference with vehicle electronics. Its metric M14 x 1.25 thread size and 17 mm reach make it compatible with a variety of GM vehicles requiring precise fitment.

Compatible Vehicles and Applications

• Chevrolet Avalanche, Camaro, Caprice, Corvette, Impala, Monte Carlo, Silverado, Suburban, Tahoe
• Cadillac CTS, Escalade, Escalade ESV, Escalade EXT
• GMC Sierra 1500, Sierra 2500 HD, Sierra 3500 HD, Yukon, Yukon XL 1500, Yukon XL 2500
• Oldsmobile Cutlass Supreme
• Pontiac G8, Grand Prix, SS, SSR

Common Issues Addressed by XP5243 Spark Plug

• Misfires and rough idling due to worn or inefficient spark plugs
• Reduced fuel efficiency from incomplete combustion
• Difficulty starting engines in cold or demanding conditions
• Engine hesitation or loss of power under load
• Electrical interference affecting onboard electronics

Installation Notes and Tips

Ensure the spark plug gap is set according to the vehicle manufacturer’s specifications before installation. Use a torque wrench to tighten the plug to the recommended torque to avoid damage to the tapered seat. The non-removable nut terminal requires compatible ignition wire connectors. Avoid over-tightening to prevent thread damage in the cylinder head.

Quality Assurance and Warranty

Autolite manufactures the XP5243 spark plug to meet OEM standards for fit, form, and function. The use of high-quality iridium and platinum materials supports extended service life. While specific warranty details are not provided here, Autolite products typically come with manufacturer-backed quality assurance to ensure reliable performance.