🏷️ Basic Information

Make:

Porsche

Model:

928 GTS

Year:

1992, 1993

Generation:

Third Generation (928 S4 facelift/GTS)

👋 Introduction

Market Position:

The Porsche 928 GTS represented the pinnacle of the 928 model line, positioned as a grand tourer with exceptional performance, luxury, and innovative technology, targeting discerning buyers seeking a sophisticated and powerful front-engine, rear-wheel-drive coupe.

Competitive Analysis:

Competed with other high-performance grand tourers of the era, such as the Ferrari 412, Aston Martin Virage, and top-tier Mercedes-Benz S-Class coupes, offering a unique blend of German engineering, V8 power, and luxurious comfort.

Key Features:

Powerful 5.4-liter V8 engine, refined handling characteristics due to transaxle layout, luxurious interior appointments, advanced (for its time) features like ABS and optional airbags, distinctive Porsche styling.

📋 Manual Details

Coverage Areas:

Comprehensive repair, maintenance, diagnostics, adjustments, removal/installation, troubleshooting, wiring diagrams, specifications for all systems and components.

Page Count:

2836

Manual Type:

Workshop Service Manual / Repair Manual

Language:

English

Format:

PDF

Printable:

Yes

Download Type:

Instant Download

📖 Manual Coverage

Systems Covered:

Engine Mechanical (V8), Engine Management (DME/EFI), Fuel System, Ignition System, Cooling System, Lubrication System, Exhaust System, Transmission (Automatic & Manual), Drivetrain, Suspension (Front & Rear), Steering System, Braking System (ABS), Chassis and Body, Electrical System (including components, wiring, relays, fuses), Climate Control, Interior and Exterior Trim, Safety Systems (Airbags, Seatbelts), Diagnostics.

Engine Diagnostics:

Comprehensive diagnostics for the DME (Digital Motor Electronics) system, including sensor data, fault codes, and troubleshooting procedures.

Climate Control System:

Detailed information on the air conditioning and heating systems, including component operation, troubleshooting, and refrigerant handling procedures.

Fuel System Diagnostics:

Detailed troubleshooting for fuel pump, injectors, fuel pressure regulator, and fuel tank components.

Procedures Included:

Routine maintenance, scheduled servicing, disassembly and assembly of all major components, repair procedures for all systems, troubleshooting guides for common and complex issues, diagnostic procedures, adjustment procedures, replacement procedures, torque specifications, wear limits, wiring diagrams, exploded views, pictorial diagrams.

Wiring Diagrams:

Detailed, system-specific wiring diagrams are included for all electrical components, aiding in diagnostics and repair of the complex electrical system.

Torque Specifications:

Extensive lists of all critical torque specifications for engine, chassis, suspension, and drivetrain fasteners, essential for proper assembly and safety.

Body And Chassis:

Includes procedures for bodywork repairs, structural integrity checks, door, window, and sunroof mechanisms, and interior trim removal and installation.

Wheel Alignment:

Specifications and procedures for front and rear wheel alignment, including camber, caster, and toe settings.

Technical Depth:

In-depth and comprehensive, covering everything from basic fluid checks and adjustments to complete engine rebuilds, transmission overhauls, and complex electrical system diagnostics and repairs. Suitable for both professional mechanics and experienced DIY enthusiasts.

Special Tool References:

References specific Porsche special tools required for certain procedures, often accompanied by illustrations showing their use, ensuring correct and safe repair execution.

Rebuild Procedures:

Detailed step-by-step procedures for the complete disassembly, inspection, repair, and reassembly of major components like the engine, transmission, and differential.

Illustrations And Diagrams:

Abundant, high-quality illustrations, including exploded views, sectional drawings, and photographic sequences, clarify complex procedures and component identification.

📊 Manual Specifications

File Format:

PDF

Print Quality:

High-resolution, suitable for printing all 2836 pages with clear text and legible diagrams.

Binding Type:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

Software Requirement:

Adobe Reader or compatible PDF viewer.

Compatibility:

Windows, Mac OS, Linux OS.

⚙️ Engine Specifications

Engine Type:

V8, Naturally Aspirated

Displacement:

5.4 Liters (5397 cc)

Bore X Stroke:

97.0 mm x 74.4 mm (approx.)

Compression Ratio:

10.4:1

Horsepower:

345 hp @ 5700 rpm (approx.)

Torque:

374 lb-ft @ 4500 rpm (approx.)

Engine Code:

M64/01 (early GTS), M64/02 (later GTS) (approx.)

0-60 Mph:

5.7 seconds (approx.)

Top Speed:

165 mph (approx.)

Engine Layout:

Front-mounted, longitudinal

Fuel Delivery:

Bosch Motronic Electronic Fuel Injection (EFI)

Fuel Type:

Premium Unleaded Gasoline (91 Octane or higher)

Ignition System:

Electronic Ignition with Knock Control

🔧 Transmission

Transmission Type:

Tiptronic Automatic (4-speed)

Transmission Type:

5-speed Manual

Transaxle Layout:

Rear-mounted transaxle for 50/50 weight distribution

📐 Dimensions

Length:

4765 mm (187.6 in)

Width:

1815 mm (71.5 in)

Height:

1280 mm (50.4 in)

Wheelbase:

2700 mm (106.3 in)

Curb Weight:

1710 kg (3770 lbs) (approx. for automatic)

Gross Vehicle Weight Rating:

2200 kg (approx.)

Cargo Volume:

Generous for a sports coupe, with rear seats folding flat.

🛡️ Safety Features

Crash Test Information:

Specific official crash test ratings for 1992-1993 models may vary by region. Porsche vehicles of this era were known for robust construction.

Active Safety Features:

Anti-lock Braking System (ABS), Power-assisted steering, Limited-slip differential (LSD) often standard or available.

Passive Safety Features:

Driver and passenger front airbags (often optional or standard depending on market), crumple zones, reinforced passenger cell, three-point seatbelts with pretensioners.

💡 Technology Features

Infotainment System:

Factory original premium audio system (e.g., Blaupunkt or Grundig), often with cassette player. Modern aftermarket head units are common upgrades.

Driver Assistance Features:

Anti-lock Braking System (ABS) was a significant driver assistance feature for its time.

Connectivity Features:

Limited by era. Primarily focused on the vehicle's internal systems. Power windows, power mirrors, cruise control.

🔧 Maintenance

Oil Change Interval:

Typically every 7,500 miles or 12 months, whichever comes first (refer to manual for exact Porsche specification).

Major Service Interval:

e.g., timing belt replacement every 60,000 miles or 5 years. Refer to the manual for detailed periodic maintenance schedules.

Engine Oil Type:

Synthetic 5W-40 or 0W-40 (refer to manual for exact Porsche A40 approval).

Engine Oil Capacity:

Approx. 9.5 liters (10.0 US quarts) with filter change.

Coolant Type:

Porsche approved G48 or equivalent ethylene glycol based antifreeze/coolant (50/50 mix).

Transmission Fluid Automatic:

Dexron III/Mercon or equivalent. Capacity: Approx. 3.5 liters (dry fill).

Transmission Fluid Manual:

GL-4 or GL-5 gear oil, viscosity grade 75W-90. Capacity: Approx. 2.5 liters.

Brake Fluid Type:

DOT 4 or DOT 5.1

Power Steering Fluid:

ATF Dexron III or equivalent. Capacity: Approx. 1.5 liters.

Differential Fluid:

GL-5 gear oil, viscosity grade 75W-90. Capacity: Approx. 1.7 liters.

Common Issues:

Fuel line degradation (especially in warmer climates), cooling fan resistor failure, wear on front suspension bushings, rear hatch seal leakage, electrical gremlins (common in older Porsches), timing belt tensioner and idler pulley wear, transmission torque converter issues (automatic).

Troubleshooting Tips:

The manual provides detailed diagnostic trees for all common and uncommon issues, guiding technicians through systematic troubleshooting to pinpoint faults accurately.

Airbag System Maintenance:

Precautions and procedures for working with the airbag system, emphasizing safety and correct diagnostic protocols.

📚 Vehicle History

Brand Heritage:

Porsche, renowned for its sports car engineering, has a legacy dating back to the mid-20th century, known for performance, innovation, and racing success.

Model Evolution:

The 928 was introduced in 1978 as a modern GT to complement the 911. The GTS variant, introduced for the 1992 model year, was the final and most powerful iteration, featuring the larger 5.4L V8, revised styling, and enhanced performance.

Production Years:

Porsche 928: 1978-1995. 928 GTS: 1992-1995.

Manufacturing Location:

Stuttgart, Germany

🏆 Awards & Recognition

Automotive Awards:

The 928 series, including the GTS, was consistently praised for its engineering, performance, and comfort, though specific awards for the GTS model itself are less documented than its overall legacy.