NGK 4291 Spark Plug

Reliable Ignition Performance for Acura, BMW, Ford, and More

The NGK V-Power Spark Plug 4291 is engineered to deliver consistent ignition and efficient combustion for a range of vehicles including Acura, BMW, Ford, Honda, Jeep, Mazda, and Dodge models. Designed with durable materials and precise specifications, this spark plug supports optimal engine performance and reliability.

• Resistance: 5000 ohms for effective electrical noise suppression
• Ground Electrode Tip and Configuration: Standard design with a single nickel ground electrode
• Center Electrode: Copper core with nickel tip for enhanced conductivity and durability
• Pre-Gap Size: Factory set at 0.044 inches for precise spark delivery
• Thread Diameter: 14 mm with a 0.75-inch reach and flat seat type
• Hex Size: 5/8 inch for standard installation tools
• Electrical Terminal: Non-removable nut type for secure connection
• Manufacturer Heat Range: 6, suitable for a variety of engine conditions
• Insulator Height: 50.50 mm for proper fit and insulation

About the NGK V-Power Spark Plug Line

The V-Power Spark Plug line from NGK is designed to provide reliable ignition performance with a focus on durability and consistent spark delivery. This line incorporates quality materials such as copper core center electrodes and nickel tips to balance conductivity and wear resistance. The 4291 part number within this line is tailored to meet the specifications required by multiple vehicle makes and models, ensuring compatibility and dependable operation.

Technical Details and Compatibility

The NGK 4291 spark plug features a copper core center electrode with a nickel tip, which enhances electrical conductivity and heat dissipation. The single ground electrode made of nickel provides a stable spark path. With a resistance of 5000 ohms, this spark plug helps reduce electromagnetic interference that can affect vehicle electronics. The pre-gap size of 0.044 inches is factory set to optimize ignition timing and combustion efficiency. Its 14 mm thread diameter, 0.75-inch reach, and flat seat type ensure proper fitment in compatible engines.

Compatible Vehicles and Applications

• Acura models such as the TL and CL
• BMW 550i, 650i, 750i, 750Li, and X5
• Dodge Ram 1500, 2500, 3500, and their Van variants
• Ford Dakota, Durango, and Probe
• Honda Civic, CR-V, Prelude
• Jeep Grand Cherokee
• Mazda B1500, B2500, B3500, MX-6, and Colt

Common Issues Addressed by NGK 4291 Spark Plug

• Engine misfires and rough idling
• Poor fuel efficiency due to incomplete combustion
• Difficulty starting the engine in cold conditions
• Reduced engine power and acceleration
• Excessive exhaust emissions

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.044 inches as specified. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended torque to avoid damage to the threads or seat. The 5/8 inch hex size allows for standard spark plug sockets. Ensure the ignition system is off and the engine is cool before replacing spark plugs. The non-removable nut terminal type requires compatible ignition wire connectors for secure attachment.

Quality Assurance and Warranty

NGK spark plugs, including the V-Power Spark Plug 4291, are manufactured to meet strict quality standards for durability and performance. The use of copper core electrodes and nickel materials ensures long service life under normal operating conditions. While specific warranty details may vary, NGK products typically come with manufacturer-backed quality assurance to support reliable ignition system operation.