Autolite 5503 Spark Plug

Reliable Ignition with Autolite Copper Resistor Spark Plug 5503

The Autolite Copper Resistor Spark Plug 5503 delivers consistent ignition performance for a range of vehicles including Acura, Honda, Mazda, Nissan, Saab, and Toyota models. Designed with durable materials and precise specifications, this spark plug supports efficient engine operation and reliable starts.

• Resistance rating of 4000 ohms for effective electrical noise suppression
• Tapered ground electrode tip made of nickel for durability
• Copper center electrode core with nickel tip for optimal conductivity
• Stud-type electrical terminal for secure connection
• Pre-gap size of 0.044 inches (1.10 mm) for proper spark gap
• Single ground electrode with flat seat design
• Hex size of 5/8 inch (16 mm) for standard installation tools
• Reach length of 0.750 inches (19.5 mm) suitable for specified engine designs
• Ceramic insulator with mid projection for heat resistance and insulation
• Resistor type spark plug to reduce radio frequency interference

About the Autolite Copper Resistor Spark Plug Line

The Copper Resistor Spark Plug line from Autolite is engineered to provide a balance of conductivity and resistance, enhancing ignition system performance while minimizing electrical interference. The copper core center electrode improves heat dissipation and electrical conductivity, while the resistor design helps reduce ignition noise that can affect vehicle electronics. This line is suitable for a variety of domestic and import vehicles requiring reliable secondary ignition components.

Technical Details and Compatibility

The Autolite 5503 spark plug features a tapered ground electrode tip and nickel materials for both ground and center electrode tips, ensuring durability under high-temperature conditions. The flat seat and 0.750 inch reach make it compatible with many engines in Acura, Honda, Mazda, Nissan, Saab, and Toyota vehicles, including models such as the Honda Civic, Toyota Camry, Nissan Maxima, Mazda 323, and Saab 900. The 4000 ohm resistance rating helps suppress electrical noise, protecting sensitive onboard electronics.

Common Applications and Problem Solving

• Restores proper ignition timing and spark delivery in Acura Integra and Honda Prelude
• Reduces engine misfires and rough idling in Toyota Supra and Nissan 300ZX
• Improves fuel efficiency and throttle response in Mazda 323 and Honda CRX
• Minimizes radio frequency interference affecting vehicle electronics
• Supports consistent engine starts in Nissan Sentra and Toyota Corolla

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 torque application. The flat seat design requires careful seating to avoid leaks or misalignment. Always replace spark plugs in sets to maintain balanced engine performance. Check vehicle manufacturer specifications to confirm compatibility with the Autolite 5503 spark plug.

Quality Assurance and Warranty

Autolite spark plugs are manufactured to meet or exceed OEM standards for ignition components. The Copper Resistor Spark Plug 5503 undergoes rigorous quality control to ensure consistent resistance, electrode integrity, and insulator durability. While specific warranty details may vary, Autolite products typically come with a limited warranty against manufacturing defects. Consult product documentation or vehicle service providers for warranty coverage information.