NGK 3346 Spark Plug

NGK V-Power Spark Plug 3346 Overview

NGK V-Power Spark Plug 3346 is a tapered-seat ignition component built for stable secondary ignition performance in select Jaguar applications. It uses a copper center electrode core, nickel center and ground electrode tips, and a standard ground configuration to support consistent spark delivery.

Compatible With 1991-1992 Jaguar XJ12 and 1991-1992 Jaguar XJS, this NGK BR7EF spark plug is specified with a 0.028 in pre-gap and a 0.035 in OE-equivalent gap reference in the fitment notes. The 5 k? resistor design helps control electrical noise in the ignition system.

Key Features

• NGK V-Power Spark Plug line for secondary ignition service
• Part number 3346, NGK BR7EF
• Tapered seat with 14 mm thread diameter and 0.708 in reach
• Copper core center electrode for efficient heat transfer
• Nickel center and ground electrode tip materials
• 5 k? resistance and non-removable nut terminal
• Standard ground electrode design with a single ground electrode
• Heat range 7 for specified engine applications

Product Details

NGK built the V-Power Spark Plug line to serve OE-style ignition needs with consistent construction and application-specific specifications. For Jaguar XJ12 and Jaguar XJS models from 1991-1992, part number 3346 provides the correct tapered-seat format, 5/8 hex size, and BR7EF configuration called out in the catalog data. This part cross-references EBC004021 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Misfire conditions related to plug wear or incorrect heat range
• Reduced throttle response from degraded ignition performance
• Electrical interference concerns in the ignition circuit

Installation Notes

Verify the engine’s required plug gap before installation and compare the catalog notes for your Jaguar XJ12 or Jaguar XJS application. Confirm tapered-seat compatibility, thread diameter, reach, and heat range before torquing to specification. Inspect plug wires, coils, and ignition components at the same time to avoid repeat misfire concerns.

Quality Assurance

NGK is a long-established OE spark plug supplier with broad coverage across domestic and import vehicles, motorcycles, marine engines, and small-engine applications. Its North American and global manufacturing and distribution network supports consistent product availability and OE-level production standards.