The Honda A20A3 is a 1,956 cc, inline‑four naturally aspirated petrol engine produced between 1986 and 1989. It features a single overhead camshaft (SOHC) with 12 valves and Honda's PGM — FI electronic fuel injection system. This design prioritized smooth power delivery and fuel efficiency for its era, producing 86 kW (117 PS) and 162 Nm of torque.
Fitted primarily to the third — generation Honda Accord (CA chassis) and Vigor models, the A20A3 was engineered for refined, re…
Honda
Production years 1986–1989 meet the emissions standards applicable to their respective markets (e.g., US EPA Tier 0, Japanese 1983 regulations).
The Honda A20A3 is a 1,956 cc inline‑four naturally aspirated petrol engine engineered for mid‑size sedans (1986-1989). It combines SOHC 12-valve architecture with PGM-FI fuel injection to deliver smooth, linear power and dependable fuel economy. Designed to meet the emissions standards of its era, it prioritizes reliability and refinement.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,956 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 12‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 81.0 mm × 95.0 mm | |
Power output | 86 kW (117 PS) @ 5,500 rpm | |
Torque | 162 Nm @ 4,000 rpm | |
Fuel system | Honda PGM-FI (Programmed Fuel Injection) | |
Emissions standard | US EPA Tier 0 / Japanese 1983 Regulations | |
Compression ratio | 9.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | SAE 10W-40 (API SF/CC or equivalent) | |
Dry weight | Not Available |
The Honda A20A3 was used across Honda's CA platform with longitudinal mounting. This engine received minor platform-specific adaptations-different exhaust manifolds for sedan vs. coupe variants-and no significant facelift revisions occurred during its production run. All adaptations are documented in OEM technical bulletins.
The A20A3's primary reliability risk is balance shaft bearing wear, with elevated incidence in vehicles subjected to infrequent oil changes. Honda SIB 91-068 documents this issue, while owner reports frequently cite it as a source of drivetrain vibration. Extended oil drain intervals make using the correct oil viscosity critical.
Analysis derived from Honda technical bulletins (1986-1995) and aggregated owner repair data (1990-2023). Repair procedures should follow manufacturer guidelines.
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The A20A3 is generally robust with a simple SOHC design. Its main long-term concern is balance shaft bearing wear, often from poor maintenance. With regular oil changes using correct viscosity, these engines can easily exceed 300,000 km. The PGM-FI system is also notably reliable when kept in good condition.
The most frequent issues are worn balance shaft bearings (causing vibration), failing distributor/ignition modules (causing misfires), leaking thermostat housings, and brittle vacuum hoses. These are well-documented in Honda service literature and owner communities.
The A20A3 was primarily used in the third-generation Honda Accord (CA4 chassis, 1986-1989) and the contemporary Honda Vigor (CA5 chassis, 1986-1989). It was the fuel-injected variant for these models in many markets, including North America and Japan.
Minor gains are possible. The stock ECU can be chipped, and performance exhausts or intake manifolds can be fitted. However, the SOHC 12-valve head is a significant airflow bottleneck. Major power increases require extensive modification or an engine swap.
For a late-80s 2.0L, it's respectable. Expect around 9.5 L/100km (30 mpg US) in city driving and 7.0 L/100km (40 mpg US) on the highway in an Accord sedan. Real-world combined figures typically fall between 32-36 mpg US, depending on condition and driving style.
Yes. The A20A3 is an interference engine. If the timing belt fails, the pistons will collide with the open valves, causing severe internal engine damage. Adhering to the 100,000 km timing belt replacement interval is absolutely critical.
Honda originally specified SAE 10W-40 with an API SF/CC rating. Modern multi-grade oils like 10W-40 or 5W-40 meeting API SN or higher are perfectly suitable and offer better protection. Always use a quality brand and change it regularly (every 7,500 km).
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