🏷️ Basic Information

Make:

Citroen

Model:

BX

Year:

1991

Model Generation:

Series 2

👋 Introduction

Target Audience:

Professional technicians and knowledgeable DIY mechanics with basic electrical and mechanical concepts.

Manual Value Proposition:

Provides factory-level repair and maintenance knowledge, enabling informed decisions for vehicle upkeep and repair.

Ease Of Use:

Step-by-step procedures and clear guidance designed to replicate the knowledge of factory-trained technicians.

Digital Advantage:

Instant download capability allows immediate access to repair information, unlike traditional paper manuals.

📋 Manual Details

Language:

English

Vehicle Scope:

Covers all major mechanical, electrical, and bodywork systems for the 1991 Citroen BX.

Estimated Page Count:

Varies by specific edition, typically 500-1000 pages for comprehensive factory manuals.

Manual Type:

Repair Service Manual / Workshop Manual

File Format:

PDF

Digital Delivery:

Instant Download

📖 Manual Coverage

Engine Systems:

Engine mechanical (assembly, disassembly, tuning), Fuel system (carburetor/injection, fuel pump, lines), Ignition system, Cooling system, Lubrication system, Exhaust system.

Drivetrain Systems:

Transmission (manual/automatic), Clutch, Driveshafts, Differentials, Axles.

Chassis Systems:

Suspension (including HYDROPNEUMATIC systems), Steering, Brakes (hydraulic, ABS if equipped), Wheels and Tires.

Electrical Systems:

Wiring diagrams, Lighting, Starting and Charging systems, Instruments and Controls, Electronic Control Units (ECUs), Radio, Power windows/locks.

Body Systems:

Body panels, Doors, Hood, Trunk, Bumpers, Interior trim, HVAC (Heating, Ventilation, and Air Conditioning).

Maintenance Procedures:

Scheduled maintenance, Oil changes, Filter replacements, Fluid checks and top-ups, Tune-ups, Belt inspections and replacement.

Repair Procedures:

Engine overhaul, Transmission repair, Brake caliper replacement, Suspension component replacement, Electrical component troubleshooting and repair, Bodywork repair.

Diagnostics:

Troubleshooting guides, Diagnostic trouble codes (DTCs) for electronic systems, Symptom-based diagnostics.

Disassembly Assembly:

Detailed step-by-step instructions for component removal, disassembly, cleaning, inspection, reassembly, and installation.

Depth Of Coverage:

Comprehensive coverage from basic maintenance to major overhaul and diagnostics, suitable for professional technicians and advanced DIY mechanics.

📊 Manual Specifications

Print Quality:

Full Printable

Zoom Functionality:

YES (Zoom IN/OUT)

Required Software:

Adobe PDF Reader, WinZip (or equivalent unzipping software)

Compatibility:

All Versions of Windows & Mac

Binding Type:

Digital (PDF Download) - No physical binding

Paper Type:

Not Applicable (Digital Format)

⚙️ Engine Specifications

Engine Type:

Inline-4 Cylinder (Petrol/Diesel)

Engine Variants:

Common variants include 1.4L, 1.6L, 1.9L (petrol) and 1.8L, 1.9L (diesel). Specific engine codes like XU5, XU7, XU9, XUD7, XUD9 are relevant.

Horsepower Range:

Approximately 70-110 hp depending on engine variant and configuration.

Torque Range:

Approximately 110-170 Nm depending on engine variant and configuration.

Fuel Delivery:

Carburetted (e.g., Solex, Weber) or Bosch/Lucas fuel injection systems, depending on model and market. Diesel engines use injection pumps.

Ignition Type:

Electronic Ignition (Distributorless or Distributor-based with ignition module).

Cooling Medium:

Water-cooled with a thermostat and electric fan.

🔧 Transmission

Type:

5-speed Manual Transmission

Type:

4-speed Automatic Transmission (ZF or PSA sourced)

Clutch Type:

Hydraulically operated single dry plate clutch.

📐 Dimensions

Body Styles:

Hatchback (5-door), Estate/Wagon (5-door), possibly some saloon variants in specific markets.

Length:

Approx. 4100-4200 mm (Hatchback), Approx. 4400-4500 mm (Estate)

Width:

Approx. 1600-1650 mm

Height:

Approx. 1370-1400 mm (Hatchback), Approx. 1460-1490 mm (Estate)

Curb Weight:

Approx. 1000-1200 kg, depending on engine and equipment.

Gross Vehicle Weight:

Typically around 1500-1700 kg.

Trunk Volume:

Variable, with folding rear seats offering significant capacity, especially in the Estate version.

🛡️ Safety Features

Crash Test Standards:

Models from this era were tested under various European safety standards of the time; specific Euro NCAP ratings may not be directly applicable or comparable to modern standards.

Brake System:

Disc front brakes, often drum rear brakes. ABS was an optional feature on higher trims or later models.

Restraint Systems:

Seat belts (front and often rear). Airbags were not standard in 1991 for most BX models.

Body Structure:

Designed with crumple zones, reflecting contemporary safety philosophies.

💡 Technology Features

Audio System:

Basic AM/FM radio with cassette player, often with factory-fitted speakers. Aftermarket upgrades are common.

Dashboard Instruments:

Analogue gauges for speedometer, tachometer (optional), fuel level, coolant temperature, oil pressure. Warning lights for various systems.

Driver Assistance Systems:

Limited to ABS on some higher trims/later models. No electronic stability control or advanced driver-assistance systems (ADAS) as per 1991 standards.

Connectivity Features:

None in the modern sense. Pre-dates widespread adoption of auxiliary inputs, USB, or Bluetooth.

🔧 Maintenance

Oil Change Interval:

Typically every 10,000 km or 12 months, whichever comes first (refer to manual for specific engine variant and oil type).

Timing Belt Replacement:

Crucial: Every 80,000-100,000 km or 5-6 years, as failure can cause catastrophic engine damage. The manual will specify the exact interval and procedure.

Engine Oil Specification:

API SG/SH or ACEA A2/A3, viscosity typically 10W-40 or 5W-40 (fully synthetic recommended for diesel and petrol). Manual to be consulted for exact grade.

Coolant Specification:

Ethylene glycol-based antifreeze/coolant (typically purple or red) mixed 50/50 with distilled water. Do not use the green LHM fluid for the cooling system.

Brake Fluid Specification:

DOT 3 or DOT 4 (check manual). Critical for hydraulic brake system integrity.

Transmission Fluid Specification:

Manual: GL-4 specification gear oil (e.g., 75W-80 or 75W-90). Automatic: ATF Dexron II/III (check manual for specific type).

Hydropneumatic Suspension:

Leaking spheres, worn hydraulic fluid, failing pumps or pressure regulators. Requires specialized knowledge and LHM fluid (not standard hydraulic fluid).

Electrical Gremlins:

Corrosion on connectors, aging wiring insulation, and failure of electronic components (e.g., ECU, sensors) can lead to intermittent faults.

Rust And Corrosion:

As with many cars of this era, rust can be an issue, particularly around wheel arches, sills, and the rear crossmember.

Engine Performance:

Carburettor tuning issues, aging fuel lines, and potential head gasket leaks on some older petrol engines.

Oil Filter Example:

Generic examples like Mann-Filter W917, Purflux LS173 (specific part numbers depend on engine variant and should be verified).

Air Filter Example:

Generic examples like Mann-Filter C23339, Purflux A157 (specific part numbers depend on engine variant and should be verified).

📚 Vehicle History

Citroen Legacy:

Citroën has a long history of innovative automotive engineering, particularly with its hydropneumatic suspension systems first introduced in the 1950s.

Bx Development:

The BX was designed to be a more conventional and mass-market offering compared to its predecessors like the GS and CX, bridging the gap between smaller hatchbacks and larger saloons. It featured a distinct wedge-shaped design by Marcello Gandini of Bertone.

Series 2 Updates:

The 1991 model year falls within the Series 2 update, which typically included minor styling revisions, improved interiors, and updated engine options and electronic systems compared to the original Series 1 BX.

Production Period:

1982 - 1994

Manufacturing Plants:

Primarily manufactured in France (Rennes-sur-Vilaine and Aulnay-sous-Bois) and also assembled in other countries.

🏆 Awards & Recognition

Model Reception:

The BX was generally well-received for its comfort and innovative hydropneumatic suspension, though it faced competition from other hatchbacks and mid-size cars of its era.

Design Recognition:

Noted for its distinctive aerodynamic styling by Marcello Gandini.