Denso 5037 Spark Plug

Denso U-Groove Spark Plug 5037 Overview

Denso 5037 is a conventional spark plug built for older ignition systems that need consistent spark delivery and stable combustion. Its U-Groove electrode design is engineered to improve ignitability, helping support smoother engine operation and better efficiency in the applications it was built for.

Compatible With select Chevrolet S10, GMC Sonoma, Pontiac Firebird, Buick Century, and other listed GM applications, this plug is a direct-fit service part for a wide range of 1977-1995 vehicles. If you are replacing worn plugs in a Chevrolet Camaro, Pontiac Grand Am, or GMC Safari, Denso 5037 provides the correct conventional format for the specified engines.

Key Features

• U-Groove ground electrode tip design for improved spark exposure
• Conventional spark plug construction for older ignition systems
• 5000 ohm resistance for radio noise suppression
• Copper center electrode core for dependable heat transfer
• Nickel center and ground electrode tip materials
• Tapered seat design with 14.00 mm thread diameter and 11.60 mm reach
• Pre-gapped at 1.5 mm
• Cross-reference: DENSO Auto Parts T20PR-U15

Product Details

The Denso U-Groove Conventional line focuses on reliable ignition performance in applications that call for a standard spark plug design. The U-shaped ground electrode helps expose the spark kernel more effectively than a flat-edge design, which can improve ignitability in the right engine setup. Denso 5037 also uses a copper core center electrode and nickel electrode materials to support consistent operation under normal service conditions.

This part cross-references General Motors 5614024 for the same application. It is a strong match for long-tail searches such as Denso 5037 spark plug for 1985-1990 Chevrolet Astro, 1982-1992 Buick Century spark plug replacement, and 1991-1995 GMC Sonoma ignition service.

Common Issues This Part Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Misfire symptoms tied to aged secondary ignition components
• Reduced fuel efficiency from degraded plug performance
• Engine hesitation during acceleration in older GM vehicles

Installation Notes

Verify thread diameter, reach, seat type, and heat range before installation. Denso 5037 uses a tapered seat, 14.00 mm thread diameter, 11.60 mm reach, 16.0 mm hex size, and manufacturer heat range 20, so matching the engine specification is important for proper fitment. Check the existing plug gap and confirm the ignition system condition before service.

Fits 1991-1995 GMC Sonoma, N/A; 1985-1993 Chevrolet S10, N/A; 1993 Pontiac Firebird, N/A; 1982-1986 Pontiac Firebird, N/A; 1982-1992 Buick Century, N/A; 1990-1992 Chevrolet Lumina, N/A; 1982-1992 Oldsmobile Cutlass Ciera, N/A; 1980-1991 Buick Skylark, N/A; 1988-1991 Oldsmobile Cutlass Calais, N/A; 1982-1991 Pontiac 6000, N/A; 1985-1991 Pontiac Grand Am, N/A; 1985-1990 Chevrolet Astro, N/A; 1982-1990 Chevrolet Celebrity, N/A; 1985-1990 GMC S15, N/A; 1985-1990 GMC Safari, N/A; 1987-1990 Oldsmobile Cutlass Cruiser, N/A; 1985-1988 Chevrolet S10 Blazer, N/A; 1985-1988 GMC S15 Jimmy, N/A; 1984-1988 Pontiac Fiero, N/A; 1985-1987 Oldsmobile Calais, N/A; 1982-1986 Chevrolet Camaro, N/A; 1984-1985 Chevrolet Citation II, N/A; 1980-1984 Oldsmobile Omega, N/A; 1980-1984 Pontiac Phoenix, N/A; 1977-1978 Pontiac Phoenix, N/A; 1980-1983 Chevrolet Citation, N/A; 1978-1980 Oldsmobile Starfire, N/A; 1977-1980 Pontiac Sunbird, N/A; 1978-1979 Chevrolet Monza, N/A.

Quality Assurance

Denso is known for OE-level ignition component engineering, and the U-Groove Conventional line is built around consistent spark performance and serviceable fitment for listed applications. Part number 5037 is specified for the vehicles shown above and should be matched to the engine’s original plug requirements before installation.