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 performan…
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 | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 130 kg |
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.
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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.
The most common questions about engine codes, what they mean, how to find them and how this database works
Yes, the ET4 is mechanically reliable with proper maintenance. Its main weakness is the timing belt; failure to replace it at 60,000 km will cause severe engine damage. The distributor and fuel injection sensors are common electrical failure points. Regular oil changes and timely belt replacement are critical for longevity.
The most frequent issues are timing belt failure (if neglected), distributor problems, faulty fuel injection sensors (MAP/TPS), and oil leaks from the valve cover gasket. These are well-documented in Honda service bulletins and are generally inexpensive to fix.
The ET4 engine was used in the third-generation Honda Accord (CA6/CA7, 1985-1988) and the first-generation Honda Vigor (AA, 1985-1987). It was typically found in the 2.0i variants of these models.
While not a common modern tuning engine, basic modifications like an intake, exhaust, and ignition upgrades can yield modest power gains. Its primary value is in its historical significance and smooth power delivery rather than high performance potential.
Fuel economy is average for its era. Expect around 9.5-10.5 L/100km in mixed driving (approximately 27-30 mpg UK). Highway cruising can see figures closer to 7.5 L/100km (38 mpg UK), depending on driving style and vehicle condition.
Yes. The Honda ET4 is an interference engine. This means if the timing belt breaks, the pistons will contact the valves, causing catastrophic engine damage. This makes adhering to the 60,000 km replacement interval absolutely critical.
Honda originally recommended 10W-40 engine oil meeting API SF specifications. A high-quality mineral or semi-synthetic oil of this grade is suitable. Change intervals should be every 10,000 km or 6 months.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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.
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