Positioning:
The Porsche 928 represented a significant departure for Porsche, moving from traditional sports car design to a front-engined, V8-powered grand tourer, targeting a more luxurious and comfortable market segment.
Competitors:
Competed with luxury GT cars such as the Jaguar XJ-S, Aston Martin V8 Vantage, and early BMW 8 Series models.
Design Philosophy:
Avant-garde design for its era, featuring a transaxle layout for better weight distribution and independent rear suspension.
Engine Layout:
Unique front-engine, rear-wheel-drive configuration with a V8 engine.
Covered Years:
1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994
Type:
Full Service Repair Manual
Description:
This manual is designed to provide professional technicians and experienced DIY mechanics with the necessary information to perform all maintenance, diagnostics, and repair procedures.
Delivery Method:
Instant Download
Engine:
Comprehensive engine diagnostics, repair, and rebuilding for all 928 variants
Transmission:
Detailed procedures for both manual and automatic transmissions, including torque converters and clutch assemblies
Electrical:
Complete wiring diagrams, troubleshooting guides, and component testing for all electrical systems
Suspension Steering:
Front and rear suspension, steering rack, power steering system, wheel alignment procedures
Brakes:
Brake system diagnosis, repair, fluid replacement, ABS system (if applicable) maintenance
Fuel System:
Fuel pump, injectors, fuel lines, evaporative emissions control system, fuel tank maintenance
Cooling System:
Radiator, water pump, thermostat, coolant hoses, cooling fan diagnostics
Exhaust System:
Exhaust manifolds, catalytic converters, mufflers, emission control systems
HVAC:
Air conditioning system diagnosis and repair, heater core, blower motor, climate control
Body Chassis:
Body panel repair, structural components, doors, windows, locks, body trim
Chassis Alignment:
Detailed specifications and procedures for wheel alignment, suspension geometry, and ride height adjustments.
Maintenance:
Scheduled maintenance, fluid changes, filter replacements, tune-ups
Repair:
Component-level repair and replacement for all major vehicle systems
Diagnostics:
Troubleshooting charts, symptom-based diagnostics, specific procedures for fuel injection and ignition system faults.
Rebuilding:
Complete engine and transmission rebuild procedures, including detailed specifications
Refurbishing:
Guidance for restoring older components and improving vehicle aesthetics
Depth:
Comprehensive from basic maintenance to complete engine rebuilds and complex diagnostics
Diagnostic Tools:
Covers the use of specific diagnostic tools and techniques relevant to the 928's era, including ignition timing tools and fuel pressure gauges.
Quality:
High-resolution, ensuring clarity of illustrations and text
Printable:
Yes, all pages are printable
Binding:
Not Applicable (Digital Format)
Paper Type:
Not Applicable (Digital Format)
Software Requirements:
Adobe PDF Reader & WinRAR
Operating Systems:
Compatible with All Versions of Windows & Mac
Engine Type:
V8, naturally aspirated
Displacement Early:
4.5 Liters (4474 cc)
Displacement Later:
5.0 Liters (4957 cc), 5.4 Liters (5396 cc)
Horsepower Early:
Approx. 240 hp (US spec)
Horsepower Later:
Up to 326 hp (S4/GTS models)
Torque Early:
Approx. 250 lb-ft
Torque Later:
Up to 317 lb-ft (S4)
Injection:
Bosch L-Jetronic (early), Motronic (later)
Engine Code Example Early:
M30/10 (4.5L)
Engine Code Example Later:
M30/102 (5.0L S4), M30/103 (5.4L GTS)
Length:
Approx. 4735 mm (186.4 in) - varies slightly by year/model
Width:
Approx. 1785 mm (70.3 in)
Height:
Approx. 1283 mm (50.5 in)
Curb Weight Early:
Approx. 1540 kg (3395 lbs)
Curb Weight Later:
Approx. 1650 kg (3638 lbs) for S4
Crash Test Data:
Limited modern crash test data available for this era, but built with robust construction characteristic of Porsche.
ABS:
Anti-lock Braking System (ABS) became standard on later models (S4 onwards).
Airbags:
Driver airbag introduced in later model years (typically S4 onwards).
Seatbelts:
Three-point inertia-reel seatbelts.
Audio System:
Typically featured high-quality sound systems for its time, with cassette players and advanced (for the era) speaker configurations.
Cruise Control:
Standard on most models.
ABS:
Available on later models, significantly improving braking control.
Early Tech:
Focus on mechanical and analog systems, with limited electronic integration by modern standards.
Oil Change:
Typically every 7,500 to 10,000 miles or annually, depending on driving conditions. Consult manual for exact specification.
Timing Belt:
Crucial! Replace every 30,000-60,000 miles or as per manual recommendations due to interference engine design. Kit includes tensioners and idlers.
Coolant Flush:
Every 2-3 years or as specified.
Engine Oil Early:
e.g., SAE 20W-50 or SAE 10W-40 (API SG or higher, check manual for specific viscosity and rating)
Engine Oil Later:
e.g., SAE 10W-40 or 10W-30 (API SJ/SL or higher)
Coolant:
Porsche-approved coolant (e.g., G12 or equivalent) mixed with distilled water.
Brake Fluid:
DOT 3 or DOT 4 brake fluid.
Transmission Fluid Auto:
Dexron III/Mercon equivalent (check manual for specific fluid type and capacity).
Power Steering Fluid:
Pentosin CHF 11S or equivalent.
Timing Belt Failure:
Critical! Failure leads to catastrophic engine damage due to interference design. Regular replacement is paramount.
Cooling System Leaks:
Aging hoses, seals, and plastic components can lead to leaks. Water pump and radiator are common replacement items.
Fuel System Degradation:
Older fuel lines and accumulator can degrade. Bosch L-Jetronic fuel injection can be sensitive to maintenance.
Electrical Gremlins:
As with many cars of this age, aged wiring insulation, connector corrosion, and failing relays can cause intermittent issues.
Suspension Wear:
Control arm bushings, ball joints, and shocks can wear over time, affecting handling and ride comfort.
Porsche Legacy:
Porsche, renowned for its rear-engined sports cars like the 911, ventured into new territory with the 928, showcasing engineering prowess in a front-engined V8 GT.
Generation 1:
1978-1986: Initial 4.5L V8 models, characterized by pop-up headlights and a distinct aerodynamic shape.
Generation 2:
1987-1991: 928 S4 introduced with a larger 5.0L V8, improved aerodynamics, updated interior, and significant chassis revisions.
Generation 3:
1992-1994: 928 GTS launched with a 5.4L V8, updated styling, and further performance enhancements. Production ceased in 1995.
Production Period:
1978–1995
Manufacturing Location:
Stuttgart, Germany
Design Award:
The Porsche 928 was named the European Car of the Year in 1978, a significant achievement for a sports car and a testament to its innovative design and engineering.
Automotive Press:
Praised by automotive journalists for its performance, comfort, and groundbreaking design, though some criticized its departure from Porsche's traditional sports car ethos.
