A20A4 engine — CA 2.0 (2L)
2L · 121 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | A20A4 |
| Capacity | 1955 cc |
| Idle speed | 800 ± 50 rpm |
| Inlet | 0.12 - 0.17 mm |
| Exhaust | 0.25 - 0.30 mm |
| Normal | 12.26 bar |
| Minimum | 10.3 bar |
| Oil pressure | 3.8 - 4.6/3000 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Honda |
| Number of cylinders | 4 |
| Firing order | 1-3-4-2 |
| Timing stroboscopic (before TDC) | 15/750 °/rpm |
| Ignition coil resistance, primary | 1.2 - 1.5 ohms |
| Ignition coil resistance, secondary | 11000 - 11500 ohms |
| Spark plugs (make and type) | NGK BPR6EY-11 ND W20EXR-U11 |
| Spark plug gap | 1.0 - 1.1 mm |
| Fuel pump pressure | 2.3 - 2.7 bar |
| Injection pressure/system pressure | 2.3 - 2.7 bar |
| CO exhaust gas | 1.0 % |
| CO2 | 13 - 16 % |
| HC | 300 ppm |
| O2 | 0.5 - 2.0 % |
| Oil temperature during test | 80 °C |
| Fast-idle speed | 2300-2700 rpm |
| CO at fast-idle speed | 0.3 % |
| Closed-loop test at: | 600-1000 rpm |
| Lambda change (Delta Lambda) | 0.03 |
Cooling system
| Cap pressure | 0.8 - 1.0 bar |
| Thermostat opens at | 80 - 84 °C |
| Fan on at | 87 - 93 °C |
Electrical
| Battery | 50 Ah |
| Alternator | 65 A |
Capacities
| Engine sump, incl. filter | 3.5 l |
| Gearbox refill | 2.4 l |
| Gearbox refill | 3.0 l |
| Cooling system | 5.7 - 6.3 l |
Torque settings
| Cylinder head bolts — Stage 1 | 30 Nm |
| Cylinder head bolts — Stage 2 | 68 Nm |
| Front hub | 185 Nm |
| Rear hub | 185 Nm |
| Wheel nuts | 110 Nm |
| Spark plugs | 18 Nm |
Workshop procedures for this engine
Step-by-step procedures from the workshop database.
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Get free diagnosis →Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.