Autolite 388 Spark Plug

Autolite 388 Copper Resistor Spark Plug

Autolite 388 is a copper resistor spark plug built for quick starts, steady idle quality, and smooth throttle response. It follows OE-style form, fit, and function for a wide range of foreign and domestic applications, making it a practical replacement for routine ignition service.

For drivers searching for an Autolite 388 spark plug replacement, this copper resistor design uses a copper center electrode, nickel tip materials, and a 5,000 ohm resistor to support consistent ignition performance. It is a direct-fit style spark plug for many engine service needs, including common make/model applications such as Honda Civic and Toyota Corolla where the specified plug dimensions match the engine requirements.

Key Features

• Copper center electrode for reliable ignition response
• 5,000 ohm resistor helps reduce electrical noise
• Nickel center and ground electrode tip materials
• Tapered ground electrode tip design
• Flat seat with 18 mm thread diameter
• 0.561 in. reach and 0.025 in. pre-gap size
• Ceramic insulator with short insulator type
• Removable nut terminal for flexible connection styles

Product Details

Autolite Copper Resistor Spark Plug Part Number 388 is engineered as an OE-style replacement spark plug for secondary ignition service. The standard/regular center electrode design, single ground electrode, and nickel tip construction support dependable spark delivery in everyday driving conditions. The 7/8 in. hex size and flat seat configuration are important fitment points when matching the plug to the engine specification. This part number 388 is commonly searched by buyers comparing Autolite 388 against other OE replacement spark plugs for maintenance on vehicles such as Honda Civic and Toyota Corolla.

This part cross-references Champion Spark Plug 523 for the same application.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent spark delivery
• Reduced fuel economy from degraded ignition performance
• Slow throttle response during acceleration
• Misfire symptoms related to aged secondary ignition components

Installation Notes and Tips

Verify thread diameter, reach, seat type, and pre-gap before installation. Match the removable nut terminal to the ignition lead or coil-on-plug connection used on the vehicle, and confirm the engine specification for Honda Civic, Toyota Corolla, or any other listed application before service. Use proper spark plug handling practices to avoid cross-threading and ensure the plug is torqued to the manufacturer’s specification.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment channels, and this spark plug is built to OE-style dimensions and performance requirements for routine replacement service.