NGK 51439 Spark Plug Wire Set

NGK Spark Plug Wire Set for OE-Style Ignition Service

The NGK Spark Plug Wire Set, part number 51439, is a specific-fit ignition wire set built for select GM and Isuzu applications. It uses blue silicone insulation, a ferro mag core, and noise suppression to support stable spark delivery and reduced electrical interference.

NGK Spark Plug Wire Set 51439 reflects NGK’s long OE-focused background in ignition components. The brand line covers ignition products such as spark plugs, coils, boots, and wire sets, with manufacturing and distribution support aimed at OE-level replacement needs for domestic and import vehicles.

Key Features

• Specific-fit spark plug wire set for direct application matching
• Blue silicone insulation for heat-resistant wire routing
• Ferro mag core construction
• Noise suppression type: yes
• Insulation outside diameter: 7.00
• NGK part number 51439 / RC-GMX110
• Cross-references DENSO Auto Parts 671-8072 and 671-8171 for the same application

Detailed Description

This NGK Spark Plug Wire Set 51439 is engineered for vehicles that require a specific ignition wire configuration rather than a universal trim-to-fit design. It is listed for 2003-2007 Chevrolet Express 1500, Express 2500, and Express 3500; 2003-2007 GMC Savana 1500, Savana 2500, and Savana 3500; 2004 Buick Rainier; 2003-2004 Chevrolet SSR and Trailblazer EXT; 2003-2004 GMC Envoy XL; 2004 GMC Envoy XUV; and 2003-2004 Isuzu Ascender. For buyers searching by vehicle, this is a direct-fit ignition wire set for Chevrolet Express, GMC Savana, and related GM truck and SUV applications.

Built with silicone insulation and a ferro mag core, this wire set is intended to maintain consistent spark transfer while helping suppress ignition noise. The blue insulation also makes visual inspection easier during routine maintenance. If you are replacing worn ignition leads on a Chevrolet Express, GMC Savana, or Isuzu Ascender, NGK 51439 provides a vehicle-specific replacement option.

What It Helps Address

• Misfires caused by worn or damaged spark plug wires
• Hard starting related to weak ignition transfer
• Intermittent ignition noise affecting engine operation
• Cracked or heat-aged wire insulation
• Rough idle from inconsistent spark delivery

Installation Notes and Tips

Verify the vehicle’s year, make, and model before ordering, since this is a specific-fit wire set. Route each lead to match the original layout and keep wires separated from hot exhaust components and sharp edges. Inspect spark plugs, coil connections, and boots at the same time so the ignition system is serviced as a complete circuit. Fits 2003-2007 Chevrolet Express 1500, N/A; Fits 2003-2007 Chevrolet Express 2500, N/A; Fits 2003-2007 Chevrolet Express 3500, N/A; Fits 2003-2007 GMC Savana 1500, N/A; Fits 2003-2007 GMC Savana 2500, N/A; Fits 2003-2007 GMC Savana 3500, N/A; Fits 2004 Buick Rainier, N/A; Fits 2003-2004 Chevrolet SSR, N/A; Fits 2003-2004 Chevrolet Trailblazer EXT, N/A; Fits 2003-2004 GMC Envoy XL, N/A; Fits 2004 GMC Envoy XUV, N/A; Fits 2003-2004 Isuzu Ascender, N/A.

Quality Assurance

NGK states that its ignition products are manufactured to meet OE standards, supported by more than 80 years of automotive experience and a global OE legacy in ignition components. Part number 51439 is built as a replacement ignition wire set for the listed applications.