AE92 NGK Spark Plug Sets | 4A-GE (1988-91 Corolla)

NGK Laser Platinum / Iridium IX Spark Plug Sets

For 1988–1991 U.S.-market Toyota Corolla GT-S AE92 coupe equipped with the original naturally aspirated 4A-GE engine.

Overview

Refresh the ignition on your 1988–1991 U.S.-market Corolla GT-S AE92 coupe with four matching NGK spark plugs. Choose the year range matching your GT-S, then select Laser Platinum or Iridium IX.

Both styles arrive factory pre-gapped—no regapping required for the listed original-engine applications: 1.1 mm for 1988–1989 and 0.8 mm for 1990–1991. Laser Platinum retains platinum firing surfaces on both electrodes; Iridium IX offers a fine-wire iridium center electrode. The application group determines the plug profile, heat range and preset gap—not the choice of electrode material.

Key Features

• Complete four-plug set: Four matching plugs for one supported four-cylinder engine.
• Laser Platinum: Platinum firing surfaces on the center and ground electrodes resist electrode wear.
• Iridium IX: A fine-wire iridium center electrode with a tapered nickel-alloy ground electrode.
• Application-matched factory preset: Both styles use 1.1 mm for 1988–1989 or 0.8 mm for 1990–1991.
• Resistor construction: Suppresses ignition electrical interference.

Vehicle Fitment

Toyota Corolla — AE92 Coupe — U.S.-Market GT-S

• 1988–1989: Original naturally aspirated 4A-GE / Laser Platinum or Iridium IX.
• 1990–1991: Original naturally aspirated 4A-GE / Laser Platinum or Iridium IX.

Fitment Notes

• Choose the year range matching your GT-S. The 1988–1989 and 1990–1991 sets use different plug profiles, heat ranges and factory gaps and are not interchangeable.
• Not for the supercharged 4A-GZE, SR5 or other non-4A-GE engine applications.
• Fitment is for U.S.-market GT-S coupes with the original naturally aspirated engine and matching ignition leads. Japanese-market applications, swapped heads, intakes or ignition components are outside this listing's stated fitment.

Product Specifications

Product Type: Resistor Spark Plug Set
Series: Laser Platinum / Iridium IX
Electrode Design: Platinum center and ground firing surfaces (Laser Platinum); iridium center with nickel-alloy ground (Iridium IX)
Factory Preset Gap: 1.1 mm, 1988–1989; 0.8 mm, 1990–1991 — both styles within each group
NGK Heat Range: 5, 1988–1989; 6, 1990–1991
Thread: M14 × 1.25
Reach: 19 mm
Hex Size: 16 mm
Seat Type: Flat Gasket
Quantity: Four matching spark plugs per set

Which Spark Plug Should You Choose?

Laser Platinum — Best for stock restoration

Choose Laser Platinum when maintaining the original platinum plug design matters most. It retains precious-metal firing surfaces on both electrodes in the correct plug family for your selected application.

Iridium IX — Best for owners who prefer an iridium alternative

Choose Iridium IX if you prefer a fine-wire iridium design in the correct application-matched plug. A higher price or iridium center electrode alone does not establish a longer service life or everyday performance advantage over dual platinum in these engines.

For a 1988–1991 U.S.-market GT-S, the DENSO Spark Plug Sets also offer Double Platinum and Iridium TT alternatives. Select the matching 1988–1989 or 1990–1991 configuration on that listing.

Our Recommendation: Choose Laser Platinum for the original platinum design, or Iridium IX as a personal preference. Select the year range matching your GT-S before choosing either style.

Available Configurations

1. Year Range

• 1988–1989
• 1990–1991

2. Spark Plug Type

• Laser Platinum
• Iridium IX

Both spark plug types are available for each application group. Every configuration includes four matching NGK spark plugs of the selected type.