AE92 DENSO Spark Plug Set | 4A-F / 4A-FE (1988-91 Corolla)

DENSO Standard U-Groove / Iridium TT Spark Plug Sets

For 1988–1991 Toyota Corolla AE92 coupe equipped with the 4A-F or 4A-FE engine.

Overview

Refresh the spark plugs on your 1988–1991 U.S.-market Toyota Corolla SR5 AE92 coupe with an engine-matched set of four. Choose Standard U-Groove for original-style replacement or Iridium TT for a longer-wearing electrode design.

DENSO supplied original-equipment spark plugs for these engines. Both choices are factory pre-gapped — no gap adjustment required for the listed original 4A-F and 4A-FE applications.

Key Features

• Standard U-Groove: nickel firing electrodes with a copper-core center electrode.
• Channeled U-Groove ground electrode supports spark development on the Standard option.
• Iridium TT: fine iridium center electrode and platinum ground tip resist electrode wear.
• Resistor construction for ignition-noise suppression.
• Gasket-seat design and solid terminals match the original plug connections.

Vehicle Fitment

Toyota Corolla — AE92 Coupe

• 1988–1989: SR5 (U.S.-Market) / 4A-F
• 1990–1991: SR5 (U.S.-Market) / 4A-FE

Fitment Notes

• Select the year range for the original engine. Standard U-Groove plugs differ between the two year ranges; Iridium TT uses the same plugs for both.
• Engine swaps and changed cylinder heads are outside this factory-engine fitment.

Product Specifications

Brand: DENSO
Product Type: Ignition
Component Type: Spark Plug
Thread Diameter: 14 mm
Thread Reach: 19 mm
Hex Size: 16 mm
Seat Type: Gasket
Terminal Type: Solid
Factory Pre-Gapped: Standard U-Groove 1.1 mm for 1988–1989 and 0.8 mm for 1990–1991; Iridium TT 1.0 mm for both
Original Plug Gap: 1.1 mm for 1988–1989 4A-F; 0.8 mm for 1990–1991 4A-FE

Which Spark Plug Should You Buy?

Standard U-Groove — Best for Original-Style Maintenance on a Budget

Choose Standard U-Groove if you want an economical replacement that retains the original nickel-electrode design. It is the lower-priced choice for routine spark-plug service.

Iridium TT — Best for Daily Driving with Longer-Wearing Electrodes

Choose Iridium TT if electrode durability is worth the higher upfront cost. Its iridium and platinum firing tips resist wear, without a promised power increase or a vehicle-specific extended service interval.

Our Recommendation: Choose Standard U-Groove for original-style replacement and lower purchase cost, or Iridium TT when longer-wearing electrodes are your priority.

Available Configurations

Every set contains four matching DENSO spark plugs. Both spark plug types are offered for each year range.

1. Year Range

• 1988–1989 — 4A-F
• 1990–1991 — 4A-FE

2. Spark Plug Type

• Iridium TT
• Standard U-Groove