B235R engine — Saab 2.3 (2.3L)
2.3L · 224-305 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | B235R |
| Capacity | 2290 cc |
| Idle speed | 825 ± 50 rpm |
| Oil pressure | 2.5/2000 bar/rpm |
| Idle speed | 825 rpm |
| Normal | 14.0 bar |
| Differential limit between cylinders | < 2.0 bar |
| Oil pressure | 2.5 / 2000 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | Trionic T7 |
| Number of cylinders | 4 |
| Firing order | 1-3-4-2 |
| Timing stroboscopic (before TDC) | 10 / 825 °/rpm |
| Spark plugs (make and type) | NGK PFR 7H-10 (-> 06/1999) NGK PFR 6H-10 (06/1999 ->) |
| Injection pressure/system pressure | 3.0 ± 0.1 bar |
| CO exhaust gas | < 0.5 % |
| CO at fast-idle speed | < 0.3 % |
| Fast-idle speed | 2500- 2800 rpm |
| Lambda | 0.97 - 1.03 |
| Oil temperature during test | 80 °C |
| Closed-loop test at: | 600 - 1200 rpm |
| Basic method (Germany only) | Nr. 9 |
| Firing order | 1 - 3 - 4 - 2 |
| Spark plugs (make and type) | NGK PFR 6H-10 |
| Spark plug gap | 0.9 - 1.0 mm |
| Injection pressure/system pressure | 3.0 bar |
| Turbocharger (make and type) | Mitsubishi TD04HL-15T |
| Turbo boost | 0.45 bar |
| Lambda | 0.97 – 1.03 |
Cooling system
| Cap pressure | 1.4 - 1.5 bar |
| Thermostat opens at | 89 ± 2 °C |
| Stage 1/Fan 1 | 100 ± 2 °C |
| Stage 2/Fan 2 | 113 ± 2 °C |
Electrical
| Battery | 60 / 85 Ah |
| Alternator | 90 / 120 / 130 A |
| Battery | 60 / 70 Ah |
| Alternator | 130 A |
Capacities
| Engine sump, incl. filter | 4.0 l |
| Manual transmission | FM57 |
| Gearbox refill | 1.9 l |
| Automatic transmission | FA44 |
| Gearbox refill | 3.3 l |
| Initial filling | 7.2 l |
| Air-conditioner refrigerant | 800 g |
| Air-conditioner compressor oil | 150 ml |
| Engine sump, incl. filter | 5.0 l |
| Engine sump, incl. filter | 5.4 l |
| Automatic transmission | FA57 |
Torque settings
| Cylinder head bolts — Stage 1 | 40 Nm |
| Cylinder head bolts — Stage 2 | 60 Nm |
| Cylinder head bolts — Stage 3 | 90 ° |
| Spark plugs | 28 Nm |
| Wheel nuts | 110 Nm |
| Front hub | 170 Nm + 45° Nm |
| Rear hub | 50 Nm + 40° Nm |
Emissions
| Emission code | 70/220*1996/69 |
| Emission standard | Euro 2 |
| CO2 average | 229 g/km |
| CO | 0.020 g/km |
| HC NOx | 0.010 g/km |
Workshop procedures for this engine
Step-by-step procedures from the workshop database.
Got a B235R problem? Ask for free.
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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.
Specifications, service figures and torque values come from manufacturer workshop documentation. The known-faults and tips sections were drafted with AI from public sources and re-checked in October 2026; anything that could not be confirmed was removed. Where the two disagree, the factory figure is the one to use.
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 → · How these pages are made →Workshop data on this page last updated 22 Aug 2026.