NGK 5693 Spark Plug

NGK Iridium IX Spark Plug 5693

NGK Iridium IX Spark Plug 5693 is built for drivers who need consistent ignition performance and OE-style fitment across a wide range of domestic and import vehicles. With an iridium center electrode, copper core, and 5,000 ohm resistance, this spark plug is engineered for stable firing and dependable operation in applications such as Saturn SL, Saturn SC1, and Chevrolet Corvette.

Key Features

• Iridium center electrode tip material for precise spark delivery
• Copper center electrode core material for efficient heat transfer
• Nickel ground electrode core material with standard ground configuration
• Taper cut ground electrode tip design for focused ignition performance
• Pre-gapped at .032 inches; application notes may require vehicle-specific adjustment
• 14.00 mm thread diameter, .75 reach, and flat seat type
• 5/8 hex size with non-removable nut terminal
• Manufacturer heat range 4

Product Details

Part number 5693, also identified as BKR4EIX, is part of NGK’s Iridium IX Spark Plug line. NGK is a long-established OE supplier with broad coverage across domestic and import vehicles, and this spark plug reflects that background with OE-style construction and application-specific fitment. It is listed for a wide range of vehicles including 1991-2002 Saturn SL and SL1, 1993-2002 Saturn SC1, 1987-1992 Chevrolet Camaro, 1986-1991 Chevrolet Corvette, and 1988-1994 Pontiac Grand Am. This part cross-references National 5693 for the same application.

Common Uses

• Restoring weak or inconsistent spark output
• Addressing rough idle caused by worn spark plugs
• Improving cold-start ignition performance
• Replacing fouled plugs during scheduled tune-up service
• Correcting misfire conditions tied to plug wear or gap drift

Installation Notes

Verify the vehicle-specific gap before installation. Fitment notes call for 0.040 inches on Saturn SC1, Saturn SL, Saturn SL1, and Saturn SW1 applications, 0.035 inches on several Chevrolet, Buick, Oldsmobile, Pontiac, and Rolls-Royce applications, and 0.044 inches on the listed 1982 Ford, Lincoln, and Mercury models. Confirm thread diameter, reach, seat type, and heat range against the engine specification before installation. Fits 1991-2002 Saturn SL, N/A; Fits 1991-2002 Saturn SL1, N/A; Fits 1993-2002 Saturn SC1, N/A; Fits 1987-1992 Chevrolet Camaro, N/A; Fits 1986-1991 Chevrolet Corvette, N/A.

Quality Assurance

NGK manufactures spark plugs for a broad range of automotive, motorcycle, marine, and small engine applications, with North American OE supply experience and production standards focused on durability and operational performance. Part number 5693 is built to support reliable ignition service in the listed applications.