Denso 3088 Spark Plug

Denso 3088 U-Groove Spark Plug

Denso 3088 is a conventional spark plug built for stable ignition performance in a wide range of import and domestic applications. The U-Groove electrode design helps improve ignitability, supporting more efficient combustion in engines that call for a standard replacement plug.

Key Features

• U-Groove ground electrode tip design for improved spark exposure
• 5000 ohm resistor for ignition noise suppression
• Copper center electrode core for dependable heat transfer
• Nickel center and ground electrode tip materials
• Standard ground configuration with a flat seat
• 0.8 mm pre-gap size for OE-style service replacement
• 14.00 mm thread diameter, 19.00 mm reach, 20.6 mm hex size
• Manufacturer heat range 22 for specified engine applications

Product Details

This Denso U-Groove Conventional spark plug is engineered around a nickel U-groove ground electrode and copper-core center electrode to support consistent spark delivery and efficient combustion. The design is suited for drivers servicing older and late-model vehicles that specify this plug style, including applications such as Mitsubishi Lancer, Chevrolet Metro, Geo Metro, Isuzu Rodeo, Honda Passport, Porsche 944, and Audi 80. Part number 3088 also cross-references DENSO Auto Parts W22EPR-U for the same application.

The Denso U-Groove Conventional line focuses on straightforward OE-style ignition service with a design that helps the spark kernel form more readily at the electrode gap. That makes this plug a practical choice for routine tune-ups on vehicles that require a conventional nickel plug with the listed thread, reach, seat, and heat range specifications.

Common Issues This Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition at the plug gap
• Misfire symptoms tied to degraded secondary ignition components
• Reduced fuel efficiency from weak or uneven combustion
• Loss of throttle response in engines needing fresh conventional plugs

Installation Notes and Tips

Verify thread diameter, reach, seat type, heat range, and pre-gap against the vehicle service specification before installation. Use the confirmed fitment data for your exact year, make, and model, such as Fits 2003-2005 Mitsubishi Lancer, N/A; Fits 1998-2000 Chevrolet Metro, N/A; Fits 1991-1997 Isuzu Rodeo, N/A; Fits 1994-1996 Honda Passport, N/A; and Fits 1989-1991 Porsche 944, N/A. For best results, inspect ignition wires, coils, and related secondary ignition parts during service.

Quality Assurance

Denso is known for OE-level ignition component engineering, and this spark plug is built to the dimensional and material specifications listed above for accurate service replacement. Confirm vehicle application and engine requirements before installation.