NGK 3716 Spark Plug

NGK G-Power Spark Plug for Ford and Mercury

NGK G-Power Spark Plug 3716 is built for drivers servicing older Ford and Mercury ignition systems that call for a tapered-seat plug with a 14 mm thread and 0.708 in. reach. This NGK G-Power Spark Plug uses a platinum center electrode, nickel ground electrode, and 5,000 ohm resistance to support stable ignition performance in everyday driving.

The G-Power Spark Plug line is positioned as an OE-style upgrade within NGK’s ignition catalog, combining copper-core construction with a platinum tip for consistent spark delivery and dependable service life. Part number 3716 is also identified as TR5-1GP and is a direct reference point for shoppers searching NGK 3716 spark plug applications.

• Platinum center electrode tip for consistent spark performance
• Copper center electrode core for efficient conductivity
• Nickel ground electrode with standard configuration
• 5,000 ohm resistance for ignition system compatibility
• Tapered seat design with 14 mm thread diameter
• Pre-gapped to .040 in. for baseline setup
• 5 heat range and 5/8 in. hex size

Detailed Product Overview

NGK 3716 is a G-Power Spark Plug designed around OE-style dimensions and materials for a wide range of Ford Escort, Mustang, Ranger, Aerostar, LTD, Thunderbird, and Mercury Lynx, Capri, Marquis, Cougar, LN7, and Zephyr applications. It is a practical choice for owners searching for a replacement spark plug for 1983-1990 Ford Escort, 1983-1990 Ford Mustang, or 1982-1987 Mercury Lynx service needs where the specified tapered-seat fitment is required.

This part cross-references Bosch 8120 for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Misfire symptoms related to aged plugs
• Reduced throttle response from degraded spark delivery
• Maintenance replacement for high-mileage ignition service

Installation Notes and Tips

Verify the vehicle’s required seat type, thread diameter, and reach before installation. The listed applications note a spark plug gap adjustment to 0.044 in., so confirm the final gap against the vehicle service specification before use. For best results, inspect ignition wires, distributor components, and coil condition during spark plug replacement on Ford and Mercury models.

Quality Assurance

NGK is a long-established OE supplier with extensive North American coverage and manufacturing experience across automotive, motorcycle, marine, and small engine ignition products. Part number 3716 is built to NGK’s original-equipment standards for durability and operational performance.