Autolite 5243 Spark Plug

Autolite 5243 Copper Resistor Spark Plug

Autolite 5243 is a copper resistor spark plug built for OE-style fit, form, and function across a wide range of GM performance and truck applications. It is engineered for quick starts, smooth acceleration, and consistent ignition performance in vehicles such as the Chevrolet Silverado 1500, Chevrolet Camaro, and Cadillac CTS.

Key Features

• Copper center electrode for reliable conductivity and stable ignition response
• Resistor design helps reduce electrical noise in the ignition system
• Nickel ground and center electrode tip materials for durable spark delivery
• Long projection ceramic insulator for OE-style combustion chamber reach
• 0.044 in. pre-gap size and 14 mm thread diameter
• 0.679 in. reach with 5/8 in. hex size and tapered seat
• Stud terminal type for direct ignition connection

Product Line Details

Autolite Copper Resistor Spark Plugs are positioned as OE-style replacement plugs for foreign and domestic vehicles. The copper core supports dependable ignition performance, while the resistor construction and standard electrode design align with factory-style service requirements for everyday drivability.

Detailed Description

The Autolite 5243 spark plug is designed for drivers and technicians who need a direct replacement ignition component with OE-style dimensions and performance characteristics. Its copper center electrode, nickel tip materials, and tapered ground electrode design support consistent spark delivery, while the ceramic insulator and long projection profile match common factory specifications. This part number is used across many applications, including 2011-2019 Chevrolet Silverado 2500 HD, 2013-2019 GMC Sierra 3500 HD, and 2007-2016 Cadillac Escalade models. This part cross-references AGSF23C and R42LTS6 for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition output
• Reduced throttle response during acceleration
• Misfire concerns related to aged secondary ignition components
• Fuel economy loss tied to weak spark performance

Installation Notes and Tips

Verify the required gap before installation and compare it to the vehicle specification, since listed applications include 0.040 in. and 0.030 in. gap requirements depending on model and year. Confirm thread diameter, reach, seat type, and terminal style before service. For fitment examples, this plug fits 2011-2020 Chevrolet Express 2500, 2013-2020 GMC Savana 3500, and 2006-2013 Chevrolet Corvette, with application-specific gap notes shown in the fitment data.

Quality Assurance

Autolite supplies ignition products for the automotive aftermarket and original equipment channels, with a focus on OE form, fit, and function. The 5243 is built to meet the dimensional and material requirements expected for service replacement in supported Chevrolet, GMC, Cadillac, Pontiac, and other listed applications.