NGK 90046 Diesel Glow Plug

NGK Diesel Glow Plug 90046 Overview

NGK Glow Plug 90046 is a diesel glow plug built to OE-equivalent design standards for reliable cold-start performance. It is specified for select Chevrolet Express, Silverado, GMC Savana, and Sierra diesel applications, including 2006-2011 Chevrolet Silverado 2500 HD and 2006-2011 GMC Sierra 2500 HD coverage.

As part of the NGK Glow Plug line, this component reflects NGK’s long-standing OE manufacturing background and focus on original-equipment-level durability. Part number 90046 is also identified as Y1033AS and uses a threaded terminal design with a 12 mm hex, 0.391 in thread diameter, 5.39 in length, and 12-volt system voltage.

Key Features

• Diesel glow plug for OE-equivalent replacement applications
• NGK Glow Plug line for diesel engine starting support
• 12-volt system voltage with threaded terminal type
• Metal construction with flat seat design
• 12 mm hex size for service fitment
• Part number 90046, also referenced as Y1033AS

Detailed Product Information

NGK 90046 is engineered for diesel engines that require dependable preheating during startup. The listed specifications include a 4.70 voltage rating, M4 terminal thread size, 5.39-inch overall length, and a flat seat configuration. These details matter when replacing a glow plug in Chevrolet Silverado 2500 HD, Chevrolet Express 3500, GMC Savana 2500, or GMC Sierra 3500 diesel applications, where correct thread and terminal dimensions are essential for proper service fitment.

This part cross-references Autolite 1120 for the same application. It is also listed under stock number 90046 and part number Y1033AS.

Vehicle Fitment

• Fits 2007-2011 Chevrolet Express 2500, N/A
• Fits 2007-2011 Chevrolet Express 3500, N/A
• Fits 2006-2011 Chevrolet Silverado 2500 HD, N/A
• Fits 2007-2011 Chevrolet Silverado 3500 HD, N/A
• Fits 2007-2011 GMC Savana 2500, N/A
• Fits 2007-2011 GMC Savana 3500, N/A
• Fits 2006-2011 GMC Sierra 2500 HD, N/A
• Fits 2007-2011 GMC Sierra 3500 HD, N/A
• Fits 2007 Chevrolet Silverado 2500 HD Classic, N/A
• Fits 2007 Chevrolet Silverado 3500 Classic, N/A
• Fits 2007 GMC Sierra 2500 HD Classic, N/A
• Fits 2007 GMC Sierra 3500 Classic, N/A
• Fits 2006 Chevrolet Express 2500, N/A; w/Hex Threads Located Middle of Glow Plug
• Fits 2006 Chevrolet Express 3500, N/A; w/Hex Threads Located Middle of Glow Plug
• Fits 2006 Chevrolet Silverado 2500 HD, N/A; w/Hex Threads Located Middle of Glow Plug
• Fits 2006 Chevrolet Silverado 3500, N/A
• Fits 2006 Chevrolet Silverado 3500, N/A; w/Hex Threads Located Middle of Glow Plug
• Fits 2006 GMC Savana 2500, N/A; w/Hex Threads Located Middle of Glow Plug
• Fits 2006 GMC Savana 3500, N/A; w/Hex Threads Located Middle of Glow Plug
• Fits 2006 GMC Sierra 2500 HD, N/A; w/Hex Threads Located Middle of Glow Plug
• Fits 2006 GMC Sierra 3500, N/A
• Fits 2006 GMC Sierra 3500, N/A; w/Hex Threads Located Middle of Glow Plug

Common Replacement Uses

• Hard starting in cold weather on diesel engines
• Extended cranking before engine ignition
• Glow plug warning or preheat-related service concerns
• Maintenance replacement for worn diesel glow plugs
• OE-style service on Chevrolet and GMC diesel trucks and vans

Installation Notes and Tips

Verify the terminal style, thread diameter, hex size, and overall length before installation. For Chevrolet Silverado, GMC Sierra, Chevrolet Express, and GMC Savana diesel applications, confirm whether the engine uses the middle-hex-thread configuration noted in the fitment data. Clean the mounting bore and inspect the electrical connection before installing NGK 90046 to help ensure proper contact and seating.

Quality Assurance

NGK is a long-established OE supplier with broad coverage across automotive applications, and this glow plug follows the brand’s original-equipment-focused manufacturing approach. Part number 90046 is built to support durable diesel service in the listed Chevrolet and GMC applications.