Autolite 1109 Diesel Glow Plug

Autolite 1109 Diesel Glow Plug Overview

Autolite 1109 is a diesel glow plug built for dependable cold-start performance in passenger cars and light trucks. It uses a copper glow plug material, a 68w 10.5v rating, and a 10-second pre-heating time to deliver concentrated heat for diesel ignition.

Compatible With 1984-1985 Buick Century, Buick LeSabre, Buick Regal, Buick Riviera, Cadillac Commercial Chassis, Cadillac DeVille, Cadillac Eldorado, Cadillac Fleetwood, Cadillac Seville, Chevrolet Caprice, Chevrolet Celebrity, Chevrolet Impala, Oldsmobile 98, Oldsmobile Custom Cruiser, Oldsmobile Cutlass Ciera, Oldsmobile Cutlass Salon, Oldsmobile Cutlass Supreme, Oldsmobile Delta 88, Oldsmobile Toronado, Pontiac 6000, and Pontiac Parisienne diesel applications. Autolite 1109 also cross-references 12G and W145T3 for the same application.

Key Features

• Part number: 1109
• Connector type: .250" spade
• Glow plug material: copper
• Glow plug rating: 68w 10.5v
• Hex size: 9.5mm
• Overall length: 3.23" (82mm)
• Thread size: 10mm x 1.0
• Pre-heating time: 10 seconds

Detailed Description

Autolite 1109 is a direct-fit diesel glow plug for a wide range of GM diesel passenger cars and light trucks from the late 1970s through the mid-1980s. The copper construction and 68w 10.5v rating support fast heat-up at the plug tip, helping the engine reach ignition temperature during cold starts. For shoppers searching for an Autolite 1109 glow plug, this part matches the listed thread size, connector style, hex size, and overall length needed for the specified diesel applications.

Vehicle coverage includes 1984-1985 Buick Century and LeSabre, 1984-1985 Cadillac DeVille and Fleetwood, 1984-1985 Chevrolet Caprice and Impala, and 1984-1985 Oldsmobile Cutlass Supreme and Delta 88. It also covers 1979 Oldsmobile Cutlass Calais, Cutlass Salon, and Cutlass Supreme with the noted application detail that these glow plug positions do not use a voltage controller.

Common Issues This Part Addresses

• Hard starting in cold weather on diesel engines
• Extended crank time before the engine fires
• Uneven pre-heating from a worn glow plug
• Rough initial idle after startup
• Glow plug replacement for listed Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac diesel models

Installation Notes and Tips

Verify thread size, connector type, and overall length before installation. For 1979 Oldsmobile Cutlass Calais, Cutlass Salon, and Cutlass Supreme applications, follow the note that the glow plug does not use a voltage controller. Confirm the engine’s electrical system condition and inspect the harness connection at the .250" spade terminal during service.

Quality Assurance

Autolite supplies ignition products for automotive aftermarket and original equipment applications, with a focus on OE form, fit, and function across a broad range of vehicles. Autolite 1109 is built to the published specifications for the listed diesel applications.