Denso 3110 Spark Plug

Denso 3110 U-Groove Spark Plug Overview

Denso 3110 is a conventional spark plug built for steady ignition performance in secondary ignition systems. Its U-Groove electrode design is engineered to improve ignitability, helping support more complete combustion and consistent engine operation. This spark plug is a direct fit for select Volkswagen Vanagon and Chevrolet Impala applications.

Key Features

• U-Groove ground electrode tip design for improved spark exposure
• Nickel ground electrode tip and nickel center electrode tip materials
• Copper center electrode core for reliable heat transfer
• 5000 ohm resistance for suppression in ignition systems
• Standard ground configuration with one ground electrode
• Pre-gapped to 0.8 mm
• 14.00 mm thread diameter, 19.00 mm reach, and flat seat type
• Manufacturer heat range 16

Product Details

The Denso U-Groove Conventional line focuses on dependable ignition performance in a traditional spark plug format. On Denso 3110, the U-shaped ground electrode helps expose the spark kernel more effectively than a standard flat design, which can support cleaner firing under normal operating conditions. The copper core and nickel electrode materials are selected for stable conductivity and durability in everyday use. This part cross-references DENSO Auto Parts W16ESR-U for the same application.

Vehicle Fitment

• Fits 1980-1983 Volkswagen Vanagon, N/A
• Fits 1959-1961 Chevrolet Impala, N/A

Common Replacement Reasons

• Engine misfire caused by worn or fouled spark plugs
• Hard starting or inconsistent ignition performance
• Reduced fuel efficiency from weak spark delivery
• Rough idle or hesitation under acceleration
• Maintenance replacement for aging secondary ignition components

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. Denso 3110 uses a flat seat and 14.00 mm thread diameter with a 19.00 mm reach, so matching the cylinder head specification is important. Check the gap against the engine requirement before installation, and inspect ignition wires, distributor components, and coil condition when replacing spark plugs on a Volkswagen Vanagon or Chevrolet Impala.

Quality Assurance

Denso is known for OE-level ignition component engineering, and the U-Groove Conventional line is built around consistent spark delivery and dependable service life in standard applications. Part number 3110 is manufactured to support accurate fitment and repeatable ignition performance in the listed vehicles.