Autolite 3926 Spark Plug

Autolite 3926 Copper Resistor Spark Plug

Autolite 3926 is a copper resistor spark plug built for OE-style service in a wide range of older domestic and import applications. It is specified with a 0.035 in. pre-gap, 14 mm thread diameter, 0.750 in. reach, flat seat, and stud terminal for direct replacement use.

The Copper Resistor Spark Plug line focuses on quick starts, smooth acceleration, and fuel economy support while maintaining OE form, fit, and function. For drivers servicing Saturn SC1, SL1, or Mercedes-Benz 300E applications, this plug provides a straightforward replacement option at a value-focused price point.

Key Features

• Autolite part number 3926
• Copper center electrode with nickel tip material
• Resistor type plug with 4,000 ohm resistance
• 0.035 in. / 0.90 mm pre-gap
• 14.0 mm thread diameter, 5/8 in. hex size
• Flat seat with mid-projection ceramic insulator
• Single ground electrode with tapered tip design
• OE-style replacement for foreign and domestic vehicles

Product Line Details

Autolite Copper Resistor Spark Plugs are positioned as OE-style replacements for everyday ignition service. The copper core supports consistent spark delivery, while the resistor design helps control electrical noise in the ignition system. This makes Autolite 3926 a practical choice when replacing worn plugs in vehicles that call for a conventional copper plug specification.

Detailed Description

Autolite 3926 is engineered for applications that call for a copper resistor spark plug with OE-style dimensions and gap. The plug’s 0.750 in. reach, flat seat, and stud terminal help it match factory-style requirements in many Saturn, Mercedes-Benz, Rolls-Royce, Bentley, Buick, Oldsmobile, Pontiac, Chevrolet, Ford, Lincoln, and Mercury applications. Cross-reference part numbers include Champion 431 and Anchor 3183 for the same application.

Fits 1991-2002 Saturn SL, Fits 1991-2002 Saturn SL1, Fits 1991-1999 Saturn SL2, Fits 1991-1992 Saturn SC, Fits 1993-2002 Saturn SC1, Fits 1993-1999 Saturn SC2, Fits 1993-1999 Saturn SW1, Fits 1993-1999 Saturn SW2, and additional OE-style applications listed for Mercedes-Benz, Rolls-Royce, Bentley, Buick, Oldsmobile, Pontiac, Chevrolet, Ford, Lincoln, and Mercury.

Common Issues It Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent ignition output
• Reduced throttle response from aged plug electrodes
• Misfire conditions related to incorrect plug gap or wear
• Ignition noise concerns in resistor-equipped systems

Installation Notes and Tips

Verify the vehicle’s required plug gap before installation and compare it to the listed OE-style gap notes for your application. Confirm thread diameter, reach, seat type, and terminal style before ordering. For best results, install on a cool engine and follow the manufacturer’s torque specification for the cylinder head material.

Fitment examples include 1993-2002 Saturn SC1, 1991-2002 Saturn SL1, 1994-1996 Mercedes-Benz E320, and 1988-1991 Chevrolet Corvette. Always match the plug specification to the engine’s original requirements.

Quality Assurance

Autolite manufactures ignition products for aftermarket and original equipment use, with OE form, fit, and function as the core design target for this spark plug line. Part number 3926 is built to meet the dimensional and electrical requirements listed above for direct replacement service.