Autolite AP5503 Spark Plug

Overview of Autolite AP5503 Platinum Spark Plug

The Autolite AP5503 Platinum Spark Plug is engineered for reliable ignition performance in 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 combustion and consistent engine operation.

• Platinum center electrode tip and core for enhanced durability
• Tapered ground electrode tip made of nickel for stable spark delivery
• Resistor type with 4000 ohm resistance to reduce electrical noise
• Flat seat type with 14.0 mm thread diameter and 0.750 inch reach
• Ceramic mid-projection insulator for improved heat dissipation
• Pre-gap size options of 0.044 inch and 1.10 mm for optimal spark gap
• Hex size 5/8 inch (16 mm) for standard installation tools

Detailed Product Features and Specifications

The Autolite AP5503 spark plug features a platinum center electrode tip and core, which provides enhanced wear resistance and longevity compared to conventional spark plugs. The ground electrode is constructed from nickel with a tapered tip design, ensuring a consistent spark and efficient ignition. This spark plug includes a 4000 ohm resistor to minimize radio frequency interference, protecting sensitive electronic components in your vehicle.

The ceramic insulator is a mid-projection type, which helps maintain proper heat range and prevents fouling. The flat seat design and 14.0 mm thread diameter with a 0.750 inch (19.5 mm) reach make it compatible with a variety of engines. The pre-gap size is set at 0.044 inch (1.10 mm), which is critical for optimal spark performance and fuel efficiency.

About the Platinum Spark Plug Brand Line

The Autolite Platinum Spark Plug line is designed to offer a balance of durability and performance. Utilizing platinum materials on both the center electrode tip and core, these spark plugs provide longer service life and consistent ignition compared to standard copper plugs. The AP5503 model benefits from this technology, making it suitable for vehicles requiring reliable secondary ignition components.

Compatible Vehicles and Applications

• Acura Integra, Legend, and other models
• Honda Civic, Prelude, CRX, and Accord variants
• Mazda 323 and other compatible models
• Nissan 200SX, 300ZX, D21, Maxima, and Pulsar NX
• Saab 9-2X, 9-3, 900, and 9000
• Toyota 4Runner, Camry, Celica, Corolla, MR2, Supra, and others

Common Issues Addressed by Autolite AP5503

• Engine misfires due to worn or fouled spark plugs
• Reduced fuel efficiency from inconsistent ignition
• Difficulty starting the engine in cold conditions
• Interference with electronic systems caused by spark plug noise
• Premature spark plug wear in high-mileage vehicles

Installation Notes and Tips

Before installation, verify the spark plug gap matches the vehicle manufacturer’s specifications; the AP5503 comes pre-gapped at 0.044 inch (1.10 mm). Use a 5/8 inch (16 mm) socket wrench for installation. Apply anti-seize compound to the threads if recommended by the vehicle manufacturer to prevent galling. Torque the spark plug to the specified value to ensure proper sealing and performance. Inspect the ignition system components for wear or damage during replacement.

Quality Assurance and Warranty

Autolite spark plugs are manufactured to meet or exceed OEM standards for ignition components. The AP5503 model undergoes rigorous quality control to ensure consistent performance and durability. While specific warranty details may vary, Autolite typically offers coverage against manufacturing defects. Consult product documentation or the vehicle’s service manual for warranty and maintenance guidelines.