Autolite 5503 Spark Plug

Autolite Copper Resistor Spark Plug 5503

Autolite 5503 is a copper resistor spark plug built for OE-style fit, form, and function across a wide range of import applications. It is engineered for quick starts, smooth acceleration, and consistent ignition performance in vehicles such as Toyota Corolla, Honda Civic, and Nissan Maxima applications.

Key Features

• Copper center electrode core for reliable conductivity and stable spark delivery
• Nickel center and ground electrode tip materials for durable ignition performance
• 4,000 ohm resistor design to help reduce electrical noise
• 0.044 in. (1.10 mm) pre-gap for OE-style service replacement
• Flat seat, 14 mm thread diameter, 5/8 in. hex size, and 0.750 in. reach
• Ceramic insulator with mid-projection design for broad application coverage

Product Details

The Autolite Copper Resistor Spark Plug line is positioned as an OE-style replacement for foreign and domestic vehicles, with a focus on dependable ignition performance and value. Part number 5503 uses a standard center electrode design, a single ground electrode, and a stud terminal type to match common factory configurations. This part cross-references Champion Spark Plug 418 for the same application.

With its copper core and resistor construction, Autolite 5503 supports steady spark delivery and reduced radio-frequency interference in older ignition systems. It is a practical choice for drivers servicing classic and late-1980s to mid-2000s vehicles that call for a 0.044 in. gap or OE-style copper plug specification.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition output
• Slow throttle response during acceleration
• Ignition noise in resistor-equipped systems
• Maintenance replacement for OE-style spark plug service intervals

Installation Notes and Fitment Tips

Verify the specified gap before installation and confirm the vehicle’s OE plug requirement against the application notes. Fits 1999-2005 Saab 9-3, N/A. Fits 1988-1991 Honda Civic, N/A. Fits 1985-1991 Nissan Maxima, N/A. Fits 1986-1992 Toyota Supra, N/A. Fits 1986-1991 Acura Integra, N/A. Fits 1984-1989 Nissan 300ZX, N/A. Fits 1985-1989 Toyota MR2, N/A. Fits 1987-1989 Toyota Camry, N/A. Fits 1987-1989 Nissan Pathfinder, N/A. Fits 1984-1988 Nissan 200SX, N/A. Fits 1985-1987 Toyota Corolla, N/A. Additional coverage includes Saab 900, Saab 9000, Toyota Celica, Toyota Cressida, Honda CRX, Honda Prelude, Acura Legend, Nissan D21, Nissan Pulsar NX, Nissan Sentra, Mazda 323, Toyota 4Runner, and Toyota Corolla applications listed in the fitment data.

Quality Assurance

Autolite manufactures ignition products for aftermarket and original equipment use, with OE form, fit, and function as a core product standard. Part number 5503 is built to meet common factory-style spark plug requirements for a broad range of import vehicles.