NGK 4344 Spark Plug

NGK Iridium IX Spark Plug 4344 Overview

NGK Iridium IX Spark Plug 4344 is built for drivers who need precise ignition performance and OE-style reliability. With an iridium center electrode, copper core, and tapered seat design, it supports consistent spark delivery across a wide range of GM, Ford, Cadillac, and Mazda applications.

Part number 4344 is part of NGK’s Iridium IX line, a product family focused on fine-wire iridium construction for stable ignition and dependable operation in daily driving and higher-demand service.

Key Features

• Iridium center electrode tip for consistent spark performance
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with taper-cut tip design
• 5,000 ohm resistance for ignition system compatibility
• Pre-gapped at .044 inches from the factory
• Tapered seat with 14 mm thread diameter and 5/8 hex size
• NGK part number 4344 / LTR5IX-11

Detailed Description

NGK 4344 is an Iridium IX spark plug engineered for vehicles that call for a tapered-seat, 14 mm plug with a .044-inch pre-gap. The iridium tip helps maintain a stable spark point, while the copper core supports heat control during normal engine operation. The standard ground configuration and taper-cut ground electrode tip are selected to promote reliable ignition performance.

This spark plug is listed across a broad range of applications, including Chevrolet Silverado 1500, GMC Sierra 1500, Cadillac Escalade, and Ford Escape. It also appears in fitment for Chevrolet Camaro, GMC Yukon, and Mazda 3 applications, making part number 4344 a useful reference when searching for an NGK Iridium IX spark plug for GM truck, SUV, and select Ford or Mazda engines.

This part cross-references DENSO Auto Parts (e.g., 4718, 5338) for the same application.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent ignition output
• Misfire conditions related to plug wear or gap drift
• Reduced throttle response from degraded spark quality
• Maintenance replacement for high-mileage ignition service

Installation Notes and Tips

Verify engine-specific fitment before installation, since gap requirements vary by vehicle. Confirm the required gap listed for your application and check that the tapered seat matches the cylinder head design. Use proper spark plug service procedures and torque specifications for the engine.

Compatible With applications such as 2021-2025 Chevrolet Silverado 1500, 2021-2025 GMC Sierra 1500, 2023-2025 Cadillac Escalade, and 2022-2025 Ford Escape, with vehicle-specific gap settings noted in the fitment data.

Quality Assurance

NGK is a long-established OE supplier and manufacturer with North American coverage across domestic and import vehicle applications. Its manufacturing and distribution network supports original-equipment standards for durability and operational performance.