The Saab B230FIZB is a 2,290 cc, inline‑four turbocharged petrol engine produced between 1990 and 1993. It features a single overhead camshaft (SOHC) design with 8 valves and Saab's Bosch LH-Jetronic fuel injection system with an Automatic Performance Control (APC) unit, delivering 131 kW (178 PS) and 250 Nm of torque. Its robust cast-iron block and low-pressure turbocharger provided accessible performance with mechanical simplicity.
Fitted exclusively to the Saab 900 Turbo 16 S (Aero) and 9000 Aero, the B230FIZB was engineered for drivers seeking spirited performance with everyday usability. Emissions compliance was met through catalytic converters and lambda sensor feedback, allowing it to meet Euro 1 standards across its production run.
One documented reliability concern is oil sludge formation in engines subjected to chronic short-trip driving, which can lead to blocked oil passages and premature main bearing wear. This issue, highlighted in Saab Technical Service Bulletin TSB-91-03-01, is linked to specific driving patterns. Saab recommended revised oil change intervals and the use of specific detergent oils to mitigate the risk.
All production years (1990–1993) meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/3457).
The Saab B230FIZB is a 2,290 cc inline‑four turbocharged petrol engine engineered for performance variants of executive models (1990-1993). It combines Bosch LH-Jetronic fuel injection with Saab's APC boost control to deliver strong, linear power and exceptional mechanical character. Designed to meet Euro 1 standards, it prioritizes robustness and driver engagement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,290 cc | |
| Fuel type | Petrol (95 RON min, 98 RON recommended) | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged (low pressure) | |
| Bore × stroke | 96.0 mm × 79.0 mm | |
| Power output | 131 kW (178 PS) | |
| Torque | 250 Nm @ 2,500 rpm | |
| Fuel system | Bosch LH-Jetronic 2.4 with APC | |
| Emissions standard | Euro 1 | |
| Compression ratio | 8.7:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T3 (Low pressure) | |
| Timing system | Chain-driven | |
| Oil type | Saab 9316 10W-40 (Mineral or Semi-Synthetic) | |
| Dry weight | 190 kg |
The low-pressure turbo provides a broad, accessible torque curve ideal for spirited driving but requires strict adherence to 7,500 km oil change intervals with high-detergent oil to prevent sludge. Saab 9316 specification oil is critical. Using 98 RON fuel unlocks the full potential of the APC system. The chain-driven timing system is exceptionally robust. The Bosch LH-Jetronic system is reliable but requires specific diagnostic tools for fault codes. Software updates for the APC unit are available to optimize boost control.
Oil Specs: Requires detergent oil meeting Saab 9316 10W-40 specification (Saab SIB TSB-91-03-01). API SF/CC or equivalent.
Emissions: Euro 1 certification applies to all model years (VCA Type Approval #VCA/EMS/3457).
Power Ratings: Measured under SAE J1349 standards (Saab Group PT-1991).
Saab Workshop Manual: 900 (Section 2A), 9000 (Section 2A)
VCA Type Approval Database (VCA/EMS/3457)
SAE International: J1349 Engine Power Certification Standards
The Saab B230FIZB was used exclusively in high-performance Saab variants with longitudinal mounting. This engine received specific adaptations for the 900 Turbo 16 S (Aero) and 9000 Aero, including unique APC mapping and intercooler setups. All adaptations are documented in OEM technical bulletins.
The engine code is stamped on a flat pad on the front of the cylinder block, just below the exhaust manifold (Saab Workshop Manual 900, Section 2A). The 8th digit of the VIN is 'C' for B230FIZB engines. Visually, it can be identified by its single camshaft cover, Bosch LH-Jetronic fuel rail, and the presence of a turbocharger and intercooler. Critical differentiation from the naturally aspirated B230FI: the B230FIZB has a turbocharger, intercooler, and associated plumbing. The "ZB" suffix in the code specifically denotes the high-performance Aero variant with unique APC calibration.
The B230FIZB's primary reliability risk is oil sludge formation in engines subjected to chronic short-trip driving, with elevated incidence in urban use. Saab TSB-91-03-01 documented this issue, while owner club data suggests diligent maintenance renders the engine exceptionally robust. Infrequent oil changes and low-quality oil make adherence to high-detergent specifications critical.
Analysis derived from Saab technical service bulletins (1990-1993) and Saab Owners Club failure statistics (1995-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about SAAB B230FIZB.
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