🏷️ Basic Information

Make:

Porsche

Model:

928

Model Variants:

928, 928S, 928S2, 928S4, 928GT, 928GTS

Chassis Codes:

928 (original), 928S, 928S2, 928S4, 928GT, 928GTS

👋 Introduction

Positioning:

The Porsche 928 was positioned as a premium, front-engined, rear-wheel-drive grand tourer, designed to be a more comfortable and versatile alternative to the iconic 911, while still offering exceptional performance and luxury.

Competitors:

Competed against other high-performance GT cars of its era, including models from Ferrari (e.g., 400i, 412), Aston Martin, and higher-spec BMW models.

Design Philosophy:

Transaxle design for optimal weight distribution, V8 engine for smooth power delivery, luxurious interior appointments, advanced (for its time) technology and safety features.

📋 Manual Details

Covered Years:

1977-1995

Total Pages:

> 2,600

Type:

Workshop Service Repair Manual

Language:

English

File Format:

PDF (Searchable, Printable, Bookmarked, iPad-ready)

📖 Manual Coverage

Engine:

Engine Mechanical, Engine Control System, Cooling System, Lubrication System, Fuel System (including EFI), Ignition System, Emission Control Systems, Starting System, Charging System

Drivetrain:

Manual Transaxle System, Automatic Transaxle System, Differential Case Assy, Drive Shaft, Drive Belt

Chassis:

Brake System (including Brake Fluid, Brake Booster, Brake Actuator), Steering System, Suspension System (Front & Rear), Wheel And Tire System, Wheel Alignment (Front & Rear)

Body:

Body Repair, Exterior Components (Bumpers, Doors, Hood, Roof), Interior Components (Instrument Panel, Seat Belts, Airbags), Glass and Seals, Sun Roof System

Electrical:

Electrical System, Wiring Diagrams, Wire Harness Repair, Lighting System, Combination Meter, Instrumentation, Power Window Control System, Power Mirror Control System, Power Door Lock Control System, Audio System (Radio Receiver Assy), Wiper & Washer System

Safety Systems:

Supplemental Restraint System (Airbags), Seat Belt Warning System, Shift Lock System

Maintenance:

Scheduled Maintenance, Oil Changes, Filter Replacements, Fluid Checks and Top-offs, Lubrication

Repair:

Complete Engine Overhaul, Transmission Repair, Brake System Overhaul, Suspension Component Replacement, Electrical Component Diagnosis and Repair, Body Panel Replacement, Interior Trim Restoration

Troubleshooting:

System-specific diagnostic procedures, Fault code interpretation, Common problem diagnosis and solutions

Technical Specifications:

Detailed specifications for all components, torque values, clearances, tolerances, fluid capacities, electrical parameters

Depth:

Comprehensive, covering everything from routine maintenance to complete engine and transmission rebuilds. Includes detailed diagnostic procedures and wiring diagrams.

📊 Manual Specifications

File Type:

PDF

Searchability:

Fully searchable text

Printability:

100% Printable

Bookmarking:

Bookmarked for easy navigation

Ipad Readiness:

iPad-ready

Size Mb:

560MB

Drm Status:

DRM-free

⚙️ Engine Specifications

Engine Type:

V8 (V-engine with 8 cylinders)

Displacement Early Models:

4.5 Liters (4474 cc)

Displacement 928S:

4.7 Liters (4664 cc)

Displacement 928S4:

5.0 Liters (4957 cc)

Displacement 928Gts:

5.4 Liters (5397 cc)

Horsepower Range:

Approx. 234 hp (early) to 326 hp (GTS)

Torque Range:

Approx. 260 lb-ft (early) to 360 lb-ft (GTS)

Fuel Injection:

Bosch K-Jetronic (early models), Bosch LE2-Jetronic, Bosch LH-Jetronic, Bosch DME (later models)

Type:

Liquid-cooled

ECU Systems:

Various Bosch engine control units depending on model year and specific engine variant.

🔧 Transmission

Standard Transmission:

5-Speed Manual Transaxle (initially standard, later optional on some models)

Optional Transmission:

3-Speed Automatic Transaxle (initially optional, became standard on some later variants like the 928S4, then an optional 4-speed automatic on GTS)

Layout:

Rear transaxle (engine in front, transmission and differential in rear) for optimized weight distribution.

📐 Dimensions

Body Styles:

2+2 Coupe (all models)

Curb Weight Range:

Approx. 3,300 - 3,700 lbs (1500 - 1680 kg), varying by model and equipment.

🛡️ Safety Features

Airbags:

Driver's side airbag (introduced with S4 models), Passenger airbag (later models).

Seat Belts:

Three-point inertia-reel seat belts.

ABS:

Anti-lock Braking System (ABS) standard on later models (S4 onwards).

Traction Control:

Optional or standard on certain higher-performance variants (e.g., 928GT, GTS).

💡 Technology Features

Audio System:

Factory AM/FM radio with cassette player, integrated speakers. Later models offered enhanced sound systems.

Cruise Control:

Standard on most models.

Climate Control:

Automatic climate control (later models), Air Conditioning.

Power Accessories:

Power windows, power mirrors, power seats (on some higher trims/later models).

🔧 Maintenance

Oil Change:

Typically every 5,000-7,500 miles (8,000-12,000 km) or annually, depending on driving conditions.

Timing Belt:

Crucial interval, typically 30,000-60,000 miles (50,000-100,000 km) or as specified by Porsche service bulletins for the specific engine variant. This is a non-interference engine, but belt failure causes significant issues.

Spark Plugs:

Intervals vary by plug type (copper, platinum, iridium), generally 30,000-60,000 miles.

Engine Oil Type:

API SG/SH or higher, viscosity grades like 10W-40 or 15W-50, depending on climate and specific Porsche recommendations. Check manual for precise specs.

Coolant Type:

Porsche-approved ethylene glycol-based antifreeze. Capacity typically around 10-12 liters.

Brake Fluid Type:

DOT 4 (or DOT 5.1 where specified for improved performance/longevity).

Transmission Fluid Type Auto:

Dexron III or equivalent for automatic transmissions.

Manual Transmission Fluid:

Hypoid gear oil, typically SAE 75W-90 or 80W-90.

Common Problems:

Cooling system leaks (hoses, radiator), fuel line degradation, wiring harness issues (especially older models), ABS sensor failures, fuel pump issues, differential mount wear, rear main seal leaks, interior material degradation (dash cracks, seat wear).

Timing Belt Maintenance:

Critical to follow replacement intervals to avoid catastrophic engine damage due to the V8's complexity.

📚 Vehicle History

Brand Philosophy:

Porsche has a long-standing reputation for engineering excellence, performance, and driver engagement, stemming from its motorsport heritage.

Introduction Year:

1977

Major Updates:

Introduction of the 928S (4.7L engine, increased power), 928S2 (minor updates), 928S4 (significant facelift, 5.0L engine, airbags, improved aerodynamics), 928GT (5.0L 32-valve engine, manual transmission focus), 928GTS (5.4L 32-valve engine, wider body, updated styling, improved brakes).

Production End Year:

1995

Manufacturing Location:

Stuttgart, Germany

🏆 Awards & Recognition

Safety Award:

Was notably the first Porsche to feature airbags and ABS, marking significant advancements in vehicle safety for the brand.

Design Recognition:

Often lauded for its futuristic design, considered a groundbreaking departure from Porsche's established sports car aesthetic.