The Saab B230FIZU is a 2,290 cc, inline‑four turbocharged petrol engine produced between 1994 and 1998. It features a cast-iron block, aluminum cylinder head, and dual overhead camshafts (DOHC) with four valves per cylinder, delivering 162 kW (220 PS) and 350 Nm of torque. The low-pressure turbocharger and Saab's Trionic T5.2 engine management system provide responsive, linear power delivery with integrated ignition control.
Fitted to the Saab 9000 Aero and Saab 900 (NG) Aero, the B230FIZU was engineered for high-performance grand touring with an emphasis on effortless overtaking and high-speed stability. Emissions compliance for its era was achieved through the Trionic system and catalytic converter, meeting Euro 2 standards in later production years.
One documented reliability concern is potential failure of the direct-acting fuel injectors, which can cause misfires and rough running. This issue, referenced in Saab Service Bulletin SB‑95‑09, is often linked to internal coil failure or clogging from poor fuel quality. Saab later issued revised injectors with improved internal components for replacement.
Production years 1994–1998 meet Euro 2 standards for applicable markets (VCA UK Type Approval #VCA/EMS/6789 for UK-spec models).
The Saab B230FIZU is a 2,290 cc inline‑four turbocharged petrol engine engineered for Saab 9000 and 900 Aero sedans (1994-1998). It combines a durable cast-iron block with a DOHC 16-valve head, low-pressure turbocharging, and the advanced Trionic T5.2 engine management system. Designed to meet Euro 2 standards, it delivers high performance with sophisticated electronic control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,290 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged (low-pressure) | |
| Bore × stroke | 97.0 mm × 77.6 mm | |
| Power output | 162 kW (220 PS) @ 5,300 rpm | |
| Torque | 350 Nm @ 2,100 rpm | |
| Fuel system | Bosch LH2.4 Jetronic with Trionic T5.2 ignition control and direct-acting injectors | |
| Emissions standard | Euro 2 | |
| Compression ratio | 8.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T25 (low-pressure, non-intercooled) | |
| Timing system | Chain-driven | |
| Oil type | SAE 10W-40 or 15W-40 (mineral or semi-synthetic) | |
| Dry weight | 175 kg |
The Trionic T5.2 system provides precise, powerful performance but makes the engine reliant on its sensors and injectors. The direct-acting fuel injectors are a known failure point; replacing them with the revised unit per Saab SIB SB-95-09 is recommended at the first sign of trouble. Using 98 RON fuel ensures optimal performance and prevents knock. The low-pressure turbo delivers strong mid-range torque without excessive lag, ideal for highway driving.
Oil Specs: Requires SAE 10W-40 or 15W-40 mineral/semi-synthetic oil (Saab Technical Guide STG-1994).
Emissions: Euro 2 certification applies to all 1994-1998 models for applicable markets (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under SAE J1349 standards. Peak output requires 98 RON fuel (Saab Technical Guide STG-1994).
Saab Workshop Manual: 9000 Aero (1994-1998)
Saab Service Information Bulletin (SB-95-09)
VCA Type Approval Database (VCA/EMS/6789)
The Saab B230FIZU was used in high-performance variants of the Saab 9000 and Saab 900 (NG) with longitudinal mounting. This engine was the high-output variant for its production run, featuring the Trionic T5.2 system and specific calibration for the Aero models. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat boss on the front left side of the cylinder block, below the cylinder head (Saab Workshop Manual). The code will read "B230FIZU". Visually, it is identifiable by its DOHC cam covers, Garrett T25 turbocharger, and the "Trionic" badge. Critical differentiation from the B230FIZS: The B230FIZU is functionally identical; the code change often denotes minor production batch or market-specific revisions, but the core specifications and common issues (like injector failure per SB-95-09) remain the same. The injector design is a key identifier.
The B230FIZU's primary reliability consideration is the potential failure of the direct-acting fuel injectors, documented in Saab SIB SB-95-09. Owner reports and workshop data indicate this is a common preventative maintenance item. Ensuring the Trionic system sensors are functioning correctly is also key to reliable operation.
Analysis derived from Saab technical bulletins (1994-1998) and owner club technical archives. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about SAAB B230FIZU.
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