NGK 1698 Spark Plug

NGK G-Power Spark Plug for Ford and Lincoln V8 Applications

NGK G-Power Spark Plug 1698 is built for select Ford, Lincoln, and Mercury vehicles that call for a tapered-seat spark plug with a 0.040-inch pre-gap and a 0.044-inch application gap note in the fitment data. It combines a copper core center electrode with a platinum tip and a nickel ground electrode to support consistent ignition performance in the listed applications.

Key Features

• NGK G-Power Spark Plug line for OE-style ignition service
• Part number 1698 for direct catalog identification
• Platinum-tipped center electrode with copper core
• Nickel ground electrode with standard configuration
• 5000 ohm resistance for ignition system noise control
• Tapered seat design with 12 mm thread diameter and 14 mm hex size
• Heat range 6 with 26.5 mm reach
• Pre-gap size listed at 0.040 inch

Product Details

NGK 1698 is part of the G-Power Spark Plug line, a product range focused on OE-level fit and dependable service across a wide range of vehicles. NGK has long supplied spark plugs for domestic and import applications, and this plug reflects that background with a platinum center electrode, copper core construction, and a standard single-ground-electrode layout. The tapered seat and specified dimensions help match the factory-style requirements for the listed Ford Expedition, Ford Explorer, Ford F-150, Ford Mustang, Lincoln Navigator, and Mercury Mountaineer applications. This part number is also referenced as ZNAR6AGP.

Compatible With 2008-2014 Ford Expedition, N/A; 2008-2010 Ford Explorer, N/A; 2008-2010 Ford Explorer Sport Trac, N/A; 2008-2010 Ford F-150, N/A; 2008-2010 Ford F-250 Super Duty, N/A; 2008-2010 Ford F-350 Super Duty, N/A; 2008-2010 Ford Mustang, N/A; 2008-2014 Lincoln Navigator, N/A; 2008 Lincoln Mark LT, N/A; and 2008-2010 Mercury Mountaineer, N/A.

This part cross-references NGK 1698 for the same application.

Common Issues This Spark Plug Can Address

• Rough idle caused by worn or fouled spark plugs
• Hard starting from weakened ignition performance
• Misfire conditions related to aged plug electrodes
• Reduced throttle response from inconsistent spark delivery
• Maintenance replacement for factory-style ignition service

Installation Notes and Tips

Verify the engine style and coil boot color notes before ordering, especially for 2008 Ford, Lincoln, and Mercury applications. The fitment data calls for a 0.044-inch gap on the listed vehicles, so confirm and adjust the gap before installation. Use the tapered seat specification, 12 mm thread diameter, 14 mm hex size, and 26.5 mm reach to match the engine requirements exactly.

Quality Assurance

NGK is a major OE spark plug supplier with extensive North American coverage and more than 80 years of automotive manufacturing experience. The brand’s focus on original equipment standards and controlled manufacturing supports consistent fit and performance in the listed Ford, Lincoln, and Mercury applications.