Denso 4014 Spark Plug

Denso 4014 U-Groove Spark Plug

The Denso 4014 spark plug is a conventional ignition component built with a U-groove ground electrode to improve ignitability and support more efficient combustion. It uses a copper center electrode core with nickel tip materials for dependable secondary ignition performance in the right application.

Key Features

• U-groove ground electrode tip design for improved spark exposure
• Conventional ground configuration with one ground electrode
• Copper center electrode core material for stable conductivity
• Nickel center and ground electrode tip materials
• Pre-gapped to 0.7 for the specified application
• 14 mm thread diameter, 12.70 mm reach, and flat seat design
• Manufacturer heat range 14
• Cross-reference: DENSO Auto Parts W14FP-UL

Product Details

As part of Denso’s U-Groove Conventional line, the 4014 is engineered for drivers who need a straightforward spark plug design with focused ignition performance. The U-groove electrode shape helps expose the spark kernel more effectively, which can support cleaner combustion and smoother engine operation when matched to the correct engine specification. For shoppers searching for a Denso 4014 spark plug, Denso 4014 ignition tune-up parts, or a U-groove spark plug for Denso applications, this part is built around the listed dimensions and heat range.

Use this spark plug when servicing vehicles that call for a 14 mm thread, 12.70 mm reach, flat seat, and 0.7 pre-gap. It is a practical choice for maintenance on select Denso-equipped ignition systems and related vehicle applications, including Denso spark plug replacement searches for make/model-specific service work.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition firing
• Misfire conditions related to degraded plug electrodes
• Reduced combustion efficiency from excessive plug wear
• Service intervals where a direct spark plug replacement is needed

Installation Notes

Verify thread diameter, reach, seat type, and heat range against the vehicle service specification before installation. Check the pre-gap against the engine requirement and confirm the plug is appropriate for the cylinder head design. For make/model searches such as Denso 4014 Honda Civic spark plug or Denso 4014 Toyota Corolla spark plug, always match the engine’s specified ignition component dimensions before service.

Quality Assurance

Denso is a recognized ignition parts manufacturer, and the U-Groove Conventional line focuses on consistent electrode design and application-specific fitment. This part cross-references DENSO Auto Parts W14FP-UL for the same application.