4ZD1 engine — Opel 2.3 (2.3L)
2.3L · 90 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | 4ZD1 |
| Capacity | 2254 cc |
| Idle speed | 900 rpm |
| Inlet | 0.15 mm |
| Exhaust | 0.25 mm |
| Inlet | 0.20 mm |
| Exhaust | 0.30 mm |
| Normal | 12.0 bar |
| Minimum | 7.8 bar |
| Oil pressure | 3.9 - 4.9/4000 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Nippon KiKaki (1989-1991) Hitachi (1992-1994) |
| Number of cylinders | 4 |
| Firing order | 1-3-4-2 |
| Timing stroboscopic (before TDC) | 6/900 °/rpm |
| Spark plugs (make and type) | Bosch FR8LDC |
| Spark plug gap | 1.05 mm |
| CO exhaust gas | 1989-1991 : < 0.6 1992-1994 : <0.5 % |
| Lambda | 0.97-1.03 |
| Lambda change (Delta Lambda) | 0.02 |
| Oil temperature during test | 80 °C |
| Fast-idle speed | 2800-3200 rpm |
| CO at fast-idle speed | 1989-1991 : < 0.6 1992-1994 : < 0.3 % |
| Closed-loop test at: | 750-1050 rpm |
| Fuel system (make and type) | Hitachi MPFi |
| Timing stroboscopic (before TDC) | 12/900 °/rpm |
| CO exhaust gas | < 0.5 % |
| CO at fast-idle speed | < 0.3 % |
Cooling system
| Cap pressure | 1.2 bar |
| Thermostat opens at | 82-95 °C |
Electrical
| Battery | 60 Ah |
| Alternator | 45 A |
Capacities
| Engine sump, incl. filter | 3.5 l |
| Manual transmission | MSG |
| Gearbox refill | 4.4 l |
| Manual transmission | MUA |
| Gearbox refill | 2.95 l |
| Differential | 1.55 l |
| Transfer box | 1.45 l |
| Differential, 4WD front | 167 mm : 1.0 194 mm : 1.4 l |
| Differential, 4WD rear | 194 mm : 1.8 220 mm : 1.5 l |
| Cooling system | 9.0 l |
Torque settings
| Cylinder head bolts — Stage 1 | 75 Nm |
| Cylinder head bolts — Stage 2 | 100 Nm |
| Front hub | (4x4) 15 (4x4) 20-25 Nm |
| Rear hub | 75 Nm |
| Wheel nuts | 90 Nm |
| Spark plugs | 20 Nm |
Workshop procedures for this engine
Step-by-step procedures from the workshop database.
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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.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.