The Honda ET4 is a 1,829 cc, inline‑four petrol engine produced between 1985 and 1988. It features a single overhead camshaft (SOHC) with 8 valves and Honda's PGM-FI (Programmed Fuel Injection) system. This design offered a balance of smooth power delivery and fuel efficiency for its era, delivering 77 kW (105 PS) and 152 Nm of torque.
Fitted primarily to the third-generation Honda Accord (CA6/CA7) and Vigor (AA), the ET4 was engineered for refined, comfortable performance in mid-size sedans. Emissions compliance for its production period was met through electronic fuel injection and a catalytic converter, allowing it to meet contemporary Japanese and European standards.
One documented engineering characteristic is its longitudinal mounting in the Accord, which was highlighted in Honda Service Bulletin 85-015. This layout, unusual for a front-wheel-drive Honda, was chosen to optimize weight distribution and NVH characteristics for the larger Accord platform.
Production years 1985–1988 meet applicable Japanese and European emissions standards for passenger vehicles of that era (Honda Internal Emissions Certification Docs).
The Honda ET4 is a 1,829 cc inline‑four naturally aspirated petrol engine engineered for mid-size sedans (1985-1988). It combines SOHC 8-valve architecture with PGM-FI fuel injection to deliver smooth, linear power and refined cruising. Designed to meet 1980s emissions standards, it prioritizes drivability and mechanical simplicity.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,829 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 89.0 mm | |
| Power output | 77 kW (105 PS) @ 5,500 rpm | |
| Torque | 152 Nm @ 3,500 rpm | |
| Fuel system | PGM-FI (Programmed Fuel Injection) | |
| Emissions standard | Contemporary Japanese/European Standards | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | 10W-40 (API SF) | |
| Dry weight | 130 kg |
The longitudinal mounting provides a unique driving feel for a Honda but requires strict adherence to 60,000 km timing belt replacement intervals to prevent catastrophic failure. The PGM-FI system requires clean fuel filters and properly functioning sensors for optimal performance. The distributor-based ignition system should be inspected for wear. Regular oil changes with the correct viscosity protect the valvetrain.
Oil Specs: Requires 10W-40 meeting API SF specification (Honda Owner's Manual 1986 Accord).
Emissions: Certification applies to 1985-1988 models for their respective markets (Honda Internal Emissions Certification Docs).
Power Ratings: Measured under JIS D 1001 standards (Honda Group PT-1987).
Honda Technical Information System (TIS): Workshop Manual 1986 Accord, SIB 85-015
Honda Electronic Parts Catalogue (EPC): Doc. H-ET4-85
Honda Owner's Manual: 1986 Accord
The Honda ET4 was used across Honda's CA and AA platforms with longitudinal mounting. This engine received minor ECU and accessory bracket variations between sedan models, creating minor part number differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the engine block, near the timing belt cover (Honda Workshop Manual 1986 Accord). Visually, it can be identified by its SOHC valve cover and longitudinal orientation in the engine bay. Critical differentiation from the A20A: The ET4 is longitudinally mounted in the Accord CA6/CA7, while the A20A is transversely mounted in the Prelude. The distributor is mounted at the rear of the cylinder head.
The ET4 is generally robust, with the primary long-term concern being timing belt failure if replacement intervals are neglected. Honda service data indicates that failure to replace the belt at 60,000 km can lead to catastrophic engine damage due to its interference design. The distributor and fuel injection sensors are also common wear items after 150,000 km.
Analysis derived from Honda technical bulletins (1985-1988) and aggregated workshop repair data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HONDA ET4.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with HONDA or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
HONDA Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialHONDA documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
