DENSO Spark Plug Set | 3VZ-E (1988-95 4Runner)

DENSO OE U-Groove / Iridium TT Spark Plug Sets

For 1988–1995 Toyota 4Runner with the 3VZ-E engine

Overview

DENSO was an original-equipment spark plug supplier to Toyota for these 3VZ-E applications. Each configuration includes six DENSO spark plugs matched to the vehicle's model-year-specific plug family, with a choice between Standard U-Groove nickel and Iridium TT.

Factory Pre-Gapped for the Covered Application: Standard U-Groove plugs are supplied at 0.8 mm (0.032 in), while Iridium TT plugs are supplied at 1.0 mm (0.039 in). The different factory presets are intentional for the two electrode technologies, and no pre-installation gap adjustment is required for the covered stock 3VZ-E applications.

Key Features

• OE supplier pedigree: DENSO supplied original-equipment spark plugs for Toyota 3VZ-E applications.
• Complete six-plug set for one 3VZ-E V6.
• Two spark plug technologies: Standard U-Groove nickel or Iridium TT.
• Application-ready factory presets: 0.8 mm for Standard U-Groove and 1.0 mm for Iridium TT.
• Model-year-specific fitment: choose the 1988 or 1989–1995 configuration for your vehicle.
• Iridium TT twin-tip design: fine-wire iridium center tip with platinum ground tip.

Vehicle Fitment

Toyota 4Runner — 1st Gen

• 1988: 3VZ-E, 4WD — select the 1988 configuration
• 1989: 3VZ-E, 4WD — 1989–1995 configuration

Toyota 4Runner — 2nd Gen

• 1990–1995: 3VZ-E, 2WD / 4WD — 1989–1995 configuration

Fitment Notes

• Select by model year: 1988 or 1989–1995.
• Standard U-Groove and Iridium TT are both direct replacement choices for their corresponding model-year application.
• The different factory preset gaps are intentional: 0.8 mm for Standard U-Groove and 1.0 mm for Iridium TT.
• Fits factory 3VZ-E applications only; excludes 22R / 22RE / 22R-TE four-cylinder and diesel engines.

Product Specifications

Brand: DENSO
Series: Standard U-Groove / Iridium TT
Product Type: Resistor Spark Plug Set
OE Relationship: Original-equipment spark plug supplier to Toyota for the covered 3VZ-E applications
Engine: 3VZ-E
Standard Electrode Material: Nickel
Iridium TT Electrode Materials: Iridium center tip / platinum ground tip
Thread: M14 × 1.25
Thread Reach: 19 mm
Seat Type: Gasket / flat
Hex Size: 16 mm
Heat Range: DENSO 16
Standard U-Groove Factory Preset: 0.8 mm (0.032 in)
Iridium TT Factory Preset: 1.0 mm (0.039 in)
Set Quantity: 6 spark plugs

Which Spark Plug Is Right for You?

Standard U-Groove — Best for Factory-Style Replacement & Value

Choose Standard U-Groove for conventional copper-core, nickel-alloy construction and its grooved ground electrode. It is the value-focused option for routine stock-engine maintenance.

Iridium TT — Best for Premium Dual-Metal Electrode Design

Choose Iridium TT for its fine-wire iridium center tip and platinum ground tip, designed to resist electrode wear. Its premium precious-metal electrode construction offers greater resistance to electrode wear than conventional nickel.

Prefer NGK? The NGK Iridium IX Spark Plug Set for the 3VZ-E 4Runner is another respected fine-wire iridium choice, with a nickel-alloy ground electrode. NGK's linked 4Runner listing offers Iridium IX only, not a nickel option. Neither brand is universally better; both provide a quality alternative when you prefer the other electrode design or one choice is unavailable.

Our Recommendation: Choose Standard U-Groove for factory-style service and value, or Iridium TT for dual-precious-metal construction. NGK Iridium IX is a sound iridium alternative; select the version matching your 4Runner model year.

Available Configurations

1. Model Year

• 1988
• 1989–1995

2. Spark Plug Type

• Standard U-Groove: six nickel U-Groove spark plugs — 0.8 mm factory preset
• Iridium TT: six Iridium TT spark plugs — 1.0 mm factory preset