NGK 3692 Spark Plug

NGK Iridium IX Spark Plug 3692 Overview

NGK Iridium IX Spark Plug 3692 is built for drivers who need precise ignition performance and OE-style reliability. This spark plug uses an iridium center electrode, a nickel ground electrode, and a tapered seat to support consistent combustion in a wide range of Ford, Mazda, Jaguar, and Aston Martin applications.

The NGK Iridium IX line focuses on durable electrode construction and stable spark delivery. Part number 3692 is a direct-fit style spark plug for select vehicles, including Ford Focus, Ford Mustang, Ford Ranger, Mazda 3, Mazda B4000, Jaguar X-Type, Aston Martin Vanquish, and Ford Escape applications listed below.

Key Features

• Iridium center electrode tip for focused spark delivery
• Copper core center electrode for heat transfer support
• Nickel ground electrode with taper-cut tip design
• 5,000 ohm resistance for ignition system compatibility
• Tapered seat design
• 14.00 mm thread diameter, 5/8 hex size, and .708 reach
• Pre-gapped at .060 inches from the manufacturer specification
• NGK part number 3692, also referenced as TR65IX

Detailed Description

NGK 3692 is an Iridium IX spark plug engineered around a fine iridium center electrode and a copper-core construction to support dependable ignition performance. The tapered ground electrode design and standard single-ground configuration help maintain a consistent spark path, while the 5,000 ohm resistor specification supports modern ignition systems. This spark plug is listed for select 2002-2010 Ford, Mazda, Jaguar, and Aston Martin vehicles, including 2003-2010 Ford Focus, 2004-2005 Mazda 3, and 2002-2005 Jaguar X-Type applications.

This part cross-references Anchor 3066 and 3692 for the same application.

What This Spark Plug Helps Address

• Misfires caused by worn or fouled spark plugs
• Hard starting from weak ignition output
• Rough idle related to inconsistent spark delivery
• Reduced throttle response from degraded plug performance
• Maintenance replacement for select Ford Focus, Ford Mustang, Mazda 3, and Jaguar X-Type applications

Installation Notes and Fitment

• Fits 2003-2010 Ford Focus, N/A
• Fits 2002-2006 Aston Martin Vanquish, N/A
• Fits 2005 Ford Escape, N/A
• Fits 2002-2005 Jaguar X-Type, N/A
• Fits 2004-2005 Mazda 3, N/A
• Fits 2003-2004 Ford Mustang, N/A
• Fits 1997-2000 Ford Ranger, N/A
• Fits 1997-2000 Mazda B4000, N/A

Verify the specified gap for the exact application before installation. The listed fitment notes include 0.052-inch and 0.054-inch gap recommendations depending on vehicle application. Confirm thread diameter, reach, seat type, and terminal style against the original plug before service.

Quality Assurance

NGK is a long-established OE supplier and manufacturer with broad coverage across automotive, motorcycle, marine, and small engine applications. Part number 3692 reflects NGK’s focus on original-equipment standards, manufacturing consistency, and application-specific ignition components.