DENSO Spark Plug Set | 20R / 22R / 22RE / 22R-TE (1984-95 4Runner / 1979-95 Pickup)

DENSO Iridium TT / Standard U-Groove Spark Plug Sets

For 1984–1995 Toyota 4Runner and 1979–1995 Toyota Pickup with applicable 20R / 22R / 22RE / 22R-TE four-cylinder gasoline engines

Overview

Choose a complete four-plug DENSO spark plug set for the 1984–1995 Toyota 4Runner with its supported 22R / 22RE / 22R-TE engines or the 1979–1995 Toyota Pickup with 20R (1979–1980) or 22R / 22RE / 22R-TE (1981–1995). Both spark plug designs arrive factory pre-gapped for their supported stock engine applications.

Standard U-Groove has copper-core, nickel-alloy electrodes with a 0.8 mm / 0.032 in factory-set gap matching the original conventional-plug specification. Iridium TT has a fine-wire iridium center electrode and platinum needle ground tip with its intentional 1.0 mm / 0.040 in factory-set gap. Both are direct-fit, pre-gapped choices for the stock engines covered here.

Key Features

• Factory pre-gapped: Both spark plug designs arrive with their electrode gaps already set — 0.8 mm / 0.032 in. for Standard U-Groove and 1.0 mm / 0.040 in. for Iridium TT.
• Four spark plugs per set — one complete set for a 20R or 22R-family four-cylinder engine.
• Standard U-Groove: Copper-core center electrode, nickel-alloy firing surfaces, and U-Groove ground-electrode design.
• Iridium TT: 0.4 mm iridium center electrode and 0.7 mm platinum needle ground electrode.
• DENSO heat range 16 in both available designs.
• 14 mm thread diameter and 19 mm thread reach with a gasket-style seat.
• Resistor construction for factory-style ignition-system compatibility.

Vehicle Fitment

Toyota 4Runner — 1st Gen

• 1984: 22R
• 1985: 22R / 22RE
• 1986–1987: 22R / 22RE / 22R-TE
• 1988–1989: 22RE

Toyota 4Runner — 2nd Gen

• 1990–1995: 22RE

Toyota Pickup — 1st Gen

• 1979–1980: 20R
• 1981–1983: 22R

Toyota Pickup — 2nd Gen

• 1984–1985: 22R / 22RE
• 1986–1988: 22R / 22RE / 22R-TE

Toyota Pickup — 3rd Gen

• 1989–1990: 22R / 22RE
• 1991–1995: 22RE

Fitment Notes

• 20R: 1979–1980 Toyota Pickup 2WD / 4WD only; the 20R was not offered in the 4Runner.
• 22R-family engines: Factory 22R / 22RE / 22R-TE four-cylinder applications within the listed model years. Excludes the 3VZ-E V6 and diesel engines.
• Factory turbo 22R-TE: 1986–1987 Toyota 4Runner and 1986–1988 Toyota Pickup.
• Factory-preset gaps: Standard U-Groove is preset to 0.8 mm / 0.032 in.; Iridium TT is preset to 1.0 mm / 0.040 in. for its fine-wire design. Both arrive pre-gapped for the supported stock applications.
• Modified engines: Higher boost, ignition modifications, or custom tuning can require a different plug heat range or gap.

Product Specifications

Brand: DENSO
Product Type: Spark Plug Set
Available Designs: Standard U-Groove / Iridium TT
Engines: 20R / 22R / 22RE / 22R-TE
Quantity: 4 spark plugs per set
Heat Range: DENSO 16
Thread Diameter: 14 mm
Thread Reach: 19 mm
Seat Type: Gasket / flat seat
Resistor: Yes
Factory-Preset Gaps: Standard U-Groove 0.8 mm / 0.032 in.; Iridium TT 1.0 mm / 0.040 in.
Condition: New

Which Spark Plug Is Right for You?

Standard U-Groove — Best for Affordable, Factory-Style Maintenance

Choose Standard U-Groove if you want a lower-cost, factory-style replacement for routine maintenance on your stock Toyota. Its copper-core, nickel-alloy electrodes and U-grooved ground electrode deliver DENSO's conventional plug design.

Iridium TT — Best for Longer Service Life

Choose Iridium TT if you drive your Toyota regularly and value longer-lasting electrodes over the lowest upfront cost. Its fine-wire iridium center and platinum-tipped ground electrode are designed to resist wear longer than conventional nickel.

Prefer NGK? The NGK Spark Plug Sets for Toyota 4Runner / Pickup offer V-Power Nickel and Iridium IX for the same listed factory applications. NGK V-Power grooves the center electrode while DENSO U-Groove grooves the ground; NGK Iridium IX uses a nickel-alloy ground electrode instead of Iridium TT's platinum-tipped ground electrode. Both brands are reputable, and neither is universally better.

Our Recommendation: Choose Standard U-Groove for a cost-conscious, stock-style tune-up. Choose Iridium TT if longer electrode life matters more than the initial price. NGK is a sound alternative if you prefer its brand or electrode designs.

Available Configurations

Choose one complete four-plug set.

Standard U-Groove

• (4) DENSO Standard U-Groove spark plugs

Iridium TT

• (4) DENSO Iridium TT spark plugs