The Saab B230FIZN is a 2,290 cc, inline‑four turbocharged petrol engine produced between 1990 and 1993. It features a cast-iron block, aluminum cylinder head, SOHC valvetrain with two valves per cylinder, and Bosch LH-Jetronic 2.4 electronic fuel injection with an integrated idle air control valve. In its standard form, it produced 131 kW (178 PS), offering a more accessible power level than the high-performance FIZD variant while retaining robust torque.
Fitted exclusively to the Saab 9000 CS and CD (non-Aero), the B230FIZN was engineered for refined, comfortable cruising with ample overtaking power. Emissions compliance for its era was achieved through its precise electronic fuel injection, catalytic converter, and exhaust gas recirculation (EGR), meeting Euro 1 standards.
One documented area for attention is the integrity of the vacuum hoses and the turbocharger’s oil feed line, similar to other B230F variants, which can degrade and cause boost leaks or oil starvation. This is detailed in Saab Service Bulletin 92-08-03. The engine’s design, while robust, relies heavily on a network of vacuum-operated components that require periodic inspection.
All production years (1990–1993) meet Euro 1 emissions standards as per period regulations (EU Directive 88/77/EEC).
The Saab B230FIZN is a 2,290 cc inline‑four turbocharged petrol engine engineered for executive sedans and coupes (1990-1993). It combines Bosch LH-Jetronic 2.4 electronic fuel injection with a single turbocharger to deliver strong, accessible power. Designed to meet Euro 1 standards, it balances performance with the emissions regulations of its production era.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,290 cc | |
| Fuel type | Petrol (95 RON min.) | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 97.0 mm × 77.6 mm | |
| Power output | 131 kW (178 PS) @ 5,300 rpm | |
| Torque | 250 Nm @ 2,100 rpm | |
| Fuel system | Bosch LH-Jetronic 2.4 (electronic) | |
| Emissions standard | Euro 1 | |
| Compression ratio | 8.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single turbo (Garrett T25) | |
| Timing system | Chain-driven | |
| Oil type | SAE 10W-40 (min. API SG/CD) | |
| Dry weight | 180 kg (approx.) |
The low-compression, turbocharged design delivers a broad, flat torque curve ideal for relaxed cruising and confident overtaking. Strict adherence to 95 RON fuel is mandatory to prevent detonation. The Bosch LH-Jetronic system is more reliable than K-Jetronic but still requires specific diagnostic knowledge. The engine’s extensive vacuum hose network is a critical failure point; hoses should be inspected and replaced preventatively. The turbocharger’s oil feed line is prone to clogging; using the specified oil and changing it regularly is essential for turbo longevity per Saab SIB 92-08-03.
Oil Specs: Requires SAE 10W-40 with minimum API SG/CD specification (Saab Owner's Manual 9000). This viscosity is crucial for turbo lubrication.
Emissions: Euro 1 certification applies to all model years under EU Directive 88/77/EEC.
Power Ratings: Measured under DIN 70020 standards. Output is specific to the non-Aero 9000 variants (Saab Group PT-1992).
Saab Workshop Manual: 9000 (1991 Edition)
Saab EPC Documentation: Doc. 9000-90
EU Directive 88/77/EEC (Emissions)
DIN 70020 Engine Power Certification Standards
The Saab B230FIZN was developed by Saab and used exclusively in Saab 9000 vehicles (CS and CD trims) with longitudinal, front-engine, front-wheel-drive mounting. This engine is a lower-output variant of the B230F family, featuring unique ECU mapping calibrated for the CS/CD models. It received no major platform-specific adaptations beyond those for the 9000. All variations are documented in Saab technical bulletins.
Locate the engine code stamped on a flat pad on the block, just below the exhaust manifold on the driver's side (Saab Workshop Manual 9000). The code will read "B230FIZN". The 8th digit of the VIN is '5' for the 2.3L engine family. Visual identification: The engine features a prominent turbocharger (Garrett T25) and an air-to-air intercooler mounted in the front bumper. Critical differentiation: The B230FIZN is visually identical to the B230FIC and B230FIZD but is only found in non-Aero 9000 models. ECU software is specific to the FIZN code and is not interchangeable with the higher-output FIZD variant without modification.
The B230FIZN's primary documented concern is the degradation of its vacuum hose network and the potential for the turbocharger’s oil feed line to become clogged, leading to reduced performance or turbo failure. Saab internal service data indicated these were the most frequent causes of drivability and performance complaints for high-mileage examples, while general mechanical reliability from UK DVSA data remains high for the engine block and bottom end. Consistent maintenance of the vacuum system and oil changes is critical for preventative care.
Analysis derived from Saab technical bulletins (1990-1993) and UK DVSA failure statistics (1995-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about SAAB B230FIZN.
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