🏷️ Basic Information

Make:

Maserati

Model:

Biturbo

Year:

1987-1993

Chassis Codes:

AM331, AM332, AM333, AM334, AM335, AM336, AM337, AM338, AM339, AM340, AM341, AM342, AM343, AM344, AM345, AM346, AM347, AM348, AM349, AM350, AM351, AM352, AM353, AM354, AM355, AM356, AM357, AM358, AM359, AM360, AM361, AM362, AM363, AM364, AM365, AM366, AM367, AM368, AM369, AM370, AM371, AM372, AM373, AM374, AM375, AM376, AM377, AM378, AM379, AM380, AM381, AM382, AM383, AM384, AM385, AM386, AM387, AM388, AM389, AM390, AM391, AM392, AM393

👋 Introduction

Segment:

Luxury Grand Tourer / Sports Coupe

Target Audience:

Enthusiasts and owners seeking to maintain and repair their Maserati Biturbo vehicles

Key Competitors:

Porsche 911, BMW M Series, Mercedes-Benz SEC models, Jaguar XJ-S

Unique Selling Proposition:

Twin-turbocharged V6 engines, Italian styling and luxury, performance-oriented chassis

Manual Value:

Provides essential information for owners and independent workshops to service and repair a complex Italian performance car

📋 Manual Details

Main Coverage:

All models and engine types within the 1987-1993 Maserati Biturbo range

Specific Models Covered:

Biturbo, Biturbo E, Biturbo S, Biturbo Si, Biturbo SL, Biturbo Spyder, 425, 430, 430 Spyder, 422, 418, 420, 420 Si, Shamal (where applicable within the year range), Karif (where applicable within the year range)

Estimated Pages:

Extensive (specific page count not provided, but described as 'packed with all aspects')

Type:

Factory Service and Repair Workshop Manual

Language:

English

Format:

PDF

Delivery Method:

Instant Download

📖 Manual Coverage

Powertrain:

Engine mechanicals, fuel system, ignition system, cooling system, exhaust system, lubrication system

Drivetrain:

Clutch, manual transmission, automatic transmission, differential, driveshafts, axle assemblies

Suspension Steering:

Front suspension, rear suspension, shock absorbers, springs, steering system components, power steering

Brakes:

Front brake system, rear brake system, parking brake, hydraulic system, ABS (where applicable)

Electrical:

Battery, charging system, starting system, lighting system, gauges and instruments, power accessories, engine control unit (ECU) wiring, body electrical systems

Body Chassis:

Body panel removal and installation, interior trim, exterior trim, chassis components, corrosion protection

Routine Maintenance:

Oil changes, filter replacements, spark plug replacement, fluid level checks and top-offs, belt inspections and adjustments, tire rotation

Major Repairs:

Engine overhaul, transmission rebuild, differential repair, brake caliper overhaul, suspension component replacement, electrical system troubleshooting and repair

Diagnostics:

Troubleshooting guides for common and uncommon issues, diagnostic procedures for engine performance, electrical faults, and mechanical problems

Wiring Diagrams:

Comprehensive electrical wiring diagrams for all vehicle systems

Depth:

Comprehensive A-Z coverage, from basic maintenance to complex repairs and diagnostics

Instruction Style:

Easy to follow step-by-step instructions with accompanying pictures

📊 Manual Specifications

File Type:

PDF

Compatibility:

PC, MAC, Linux

Searchability:

Likely searchable text within the PDF (standard for professional PDFs)

Printability:

Printable (assumed for a service manual)

Binding:

N/A (Digital Download)

Paper:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Family:

Maserati V6 (Tipo 154)

Displacement Range:

2.0L to 2.8L

Induction:

Twin-turbocharged

Bore X Stroke 2.0L:

82 mm x 63 mm (approximate)

Bore X Stroke 2.8L:

91.4 mm x 72.3 mm (approximate)

Horsepower Range:

180 hp to 280 hp (depending on engine and tune)

Torque Range:

260 Nm to 410 Nm (depending on engine and tune)

Fuel Delivery:

Weber Marelli or Bosch fuel injection (specifics vary by model and year)

Fuel Type:

Unleaded gasoline

ECU Type:

Various electronic control units from Weber Marelli or Bosch, specific to model and engine

🔧 Transmission

Transmission Type:

5-speed manual (Getrag or ZF)

Transmission Type:

3-speed automatic (BorgWarner/Chrysler)

Clutch:

Hydraulically operated single-plate dry clutch

Manual Transmission Fluid:

GL-4 or GL-5 gear oil (API rating and viscosity to be confirmed by specific vehicle application within the manual)

Automatic Transmission Fluid:

Dexron II (or equivalent specification, to be confirmed by specific vehicle application within the manual)

📐 Dimensions

Body Styles:

2-door Coupe, 2-door Spyder (Convertible)

Wheelbase:

Approx. 2550 mm (Varies slightly by model)

Curb Weight:

Approx. 1350 - 1550 kg (Varies by model and specification)

🛡️ Safety Features

Brakes:

Four-wheel disc brakes, often ventilated front discs

ABS:

Anti-lock Braking System (ABS) was optional on some models and standard on later versions.

Seatbelts:

Three-point inertia reel seatbelts

Interior:

Reinforced safety cage structure, padded dashboard and steering column (typical for era)

💡 Technology Features

Audio System:

Typically featured premium sound systems of the era (e.g., Blaupunkt), often with cassette player and AM/FM radio.

Cruise Control:

Optional on many models.

No Modern Connectivity:

No integrated Bluetooth, USB, or smartphone connectivity as this technology did not exist during the production era.

🔧 Maintenance

Oil Change:

Typically every 5,000-7,500 km or 6-12 months (refer to manual for exact intervals based on driving conditions)

Timing Belt Replacement:

Crucial for V6 engines; intervals typically around 50,000-70,000 km or 5 years. This manual will provide precise intervals and procedures.

Major Service:

Includes spark plugs, fuel filter, air filter replacement, and general inspection; typically every 20,000-30,000 km.

Engine Oil:

Viscosity and API service rating will vary based on climate and specific engine tune. Common recommendations include 10W-40 or 15W-50 semi-synthetic or synthetic oil. Manual will specify exact requirements.

Coolant:

Ethylene glycol based antifreeze mixture. Manual will specify concentration and type.

Brake Fluid:

DOT 3 or DOT 4 hydraulic brake fluid.

Turbocharger Reliability:

Early turbochargers could be sensitive to oil quality and heat. Maintenance of oil and coolant systems is critical.

Carburetion Or Injection:

Fuel injection systems (Weber Marelli/Bosch) can be complex and require careful tuning and maintenance. Carbureted models also require regular adjustment.

Electrical Gremlins:

As with many Italian cars of this era, electrical wiring and connectors can be a source of issues if not maintained. The wiring diagrams in this manual are invaluable.

Suspension Bushings:

Rubber bushings in the suspension and steering can degrade over time, affecting handling and ride quality.

Specialized Parts:

Some specialized engine, turbo, or electronic components may be scarce, making accurate diagnostic and repair information critical.

📚 Vehicle History

Brand Origin:

Italian manufacturer founded in 1914, known for luxury sports cars and racing heritage.

Biturbo Concept:

Designed as a more accessible, albeit still luxurious and performance-oriented, Maserati to compete with German rivals. Features a sophisticated twin-turbo V6 engine and often RWD.

Key Variants:

The Biturbo line spawned numerous variants including the 420, 425, 430, Spyder, and later models like the Karif and Shamal, all sharing a common platform and engine architecture.

Production Period:

1981-1994 (with significant updates and model introductions throughout the period, including the target range of 1987-1993)

Manufacturing Location:

Modena, Italy

🏆 Awards & Recognition

General Reputation:

The Biturbo is often recognized for its distinctive styling, potent twin-turbo performance, and its role in revitalizing Maserati as a manufacturer.

Enthusiast Following:

Has cultivated a dedicated following among enthusiasts who appreciate its unique character and performance.