Porsche 928 (S S4 GT GTS) Service Repair Manual

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🏷️ Basic Information Identification Make: Porsche Model: 928 Variant: S, S4, GT, GTS Codes Internal Model Code: 928 👋 Introduction Market Position Positioning: Grand Tourer, high-performance luxury coupe, flagship model...

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Taper: Car

Distributeur:

UGS: 427447

Mots clés: 928 928 GT 928 GTS 928 S 928 S4 Car Cars Featured Porsche

Variantes de produits

Description

🏷️ Basic Information

Identification

Make:

Porsche

Model:

Variant:

S, S4, GT, GTS

Codes

Internal Model Code:

👋 Introduction

Market Position

Positioning:

Grand Tourer, high-performance luxury coupe, flagship model for Porsche

Competitive Analysis

Competitors:

Ferrari 400i, Aston Martin V8 Vantage, Jaguar XJS, BMW 8 Series (later models)

Key Features

Design Philosophy:

Transaxle layout for weight distribution, front-engine V8, rear-wheel drive, advanced engineering for its era

Target Audience:

Affluent individuals seeking a blend of performance, luxury, and long-distance comfort

📋 Manual Details

Coverage Areas

Covered Variants:

Porsche 928 S, S4, GT, GTS models

Page Count

Estimated Page Count:

Detailed analysis indicates a comprehensive manual, typically exceeding 1500 pages for this model range.

Manual Type

Type:

Factory Service Repair Workshop Manual

Language

Language:

English

Format

File Format:

Delivery

Delivery Method:

Instant PDF download after payment.

Requirements

Software Required:

Adobe PDF Reader or compatible PDF viewer.

📖 Manual Coverage

Systems Covered

Powertrain:

Engine, fuel system, cooling system, exhaust system, transmission, drivetrain

Chassis:

Suspension (front/rear), steering, brakes, wheels, tires

Electrical:

Ignition system, lighting, instrumentation, charging system, starting system, body electricals, wiring diagrams

Body:

Body panels, interior trim, windows, doors, locks, bumpers, frame

Procedures Included

Maintenance:

Scheduled maintenance, fluid changes, filter replacements, lubrication

Repair:

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

Diagnostics:

Troubleshooting guides, fault code interpretation, symptom-based diagnostics

Specifications:

Torque specifications, clearances, tolerances, fluid capacities, electrical specifications

Technical Depth

Depth:

Complete disassembly and reassembly, advanced diagnostics, factory-level repair procedures

📊 Manual Specifications

File Format

Print Quality:

High resolution, printable without restriction, clear diagrams

Searchable Text:

Yes, as a PDF, the text is generally searchable, aiding in quick information retrieval.

Binding Type

Binding:

N/A (Digital PDF Download)

Paper Type

Paper Type:

N/A (Digital PDF Download)

⚙️ Engine Specifications

Primary Engine

Engine Type:

V8, Naturally Aspirated

Displacement:

4.7L (S), 5.0L (S4, GT, GTS)

Performance

Horsepower:

S: ~231-250 hp, S4: ~306 hp, GT: ~326 hp, GTS: ~345 hp (Varies by market and specific year)

Torque:

S: ~360 Nm, S4: ~450 Nm, GT: ~470 Nm, GTS: ~470 Nm (Varies by market and specific year)

Fuel System

Injection Type:

Bosch L-Jetronic (S), Bosch DME with fuel injection (S4, GT, GTS)

Engine Codes

Early Codes:

M30.xx (pre-S4)

Later Codes:

M64.xx (S4, GT, GTS)

Cooling System

Type:

Liquid-cooled, pressurized

Valve Train

Configuration:

Single Overhead Camshaft (SOHC) per bank

🔧 Transmission

Standard

Type:

5-speed manual transaxle

Optional

Type:

3-speed automatic transaxle (e.g., automatic transaxle from ZF)

Features

Layout:

Rear-mounted transaxle (engine in front, gearbox at rear) for optimal weight distribution

Fluid Specifications

Manual Gearbox Oil:

Hypoid gear oil, API GL-4 or GL-5, viscosity typically 75W-90 or 80W-90 (refer to manual for specific Porsche approvals)

Automatic Transmission Fluid:

Dexron III or equivalent, check manual for exact specification and capacity

📐 Dimensions

Exterior

Length:

Approx. 4,655 mm (183.3 in) (Varies slightly by model year and variant)

Width:

Approx. 1,785 mm (70.3 in)

Height:

Approx. 1,280 mm (50.4 in)

Weights

Curb Weight:

Approx. 1,450 - 1,630 kg (3,197 - 3,594 lbs) (Varies by model and equipment)

Gross Vehicle Weight Rating:

Refer to vehicle VIN plate or manual

🛡️ Safety Features

Ratings

Crash Test Results:

Not extensively tested by modern standards, but known for robust build quality and safety cage construction.

Active Features

Standard on S4, GT, GTS; optional or unavailable on earlier 'S' models

Passive Features

Airbags:

Driver's airbag standard from S4 onwards; passenger airbag optional or standard on later models

Seatbelts:

3-point inertia-reel seatbelts

💡 Technology Features

Infotainment

Audio System:

Factory premium audio systems, often with cassette players or early CD integration (upgradeable).

Driver Assistance

Cruise Control:

Standard cruise control system.

Connectivity

Availability:

Limited by era; modern upgrades for Bluetooth or aftermarket head units are common.

🔧 Maintenance

Service Intervals

Oil Change:

Typically every 7,500 - 10,000 miles (12,000 - 16,000 km) or annually, refer to manual.

Timing Belt:

Non-interference engine, but replacement recommended at 60,000 miles (100,000 km) or 5-7 years for reliability, refer to manual.

Coolant Flush:

Every 2-3 years, refer to manual.

Fluid Specifications

Engine Oil Type:

API SG/SH or higher, viscosity typically 0W-40, 5W-40, or 10W-40 (check manual for exact Porsche A40/C30 approvals and capacity).

Coolant Type:

Porsche specified coolant, typically G12 or equivalent, mixed 50/50 with distilled water.

Brake Fluid Type:

DOT 4 or DOT 5.1, refer to manual for specific Porsche approval.

Known Issues

Fuel Line Leaks:

Degradation of original fuel lines, especially around the fuel distributor and injection points.

Electrical Gremlins:

Aging wiring harnesses, connectors, and relays can cause intermittent electrical issues.

HVAC System:

Climate control system (HVAC) can be complex and prone to issues with vacuum actuators, blower motor, and refrigerant leaks.

Suspension Bushings:

Wear of rubber bushings in suspension and drivetrain mounts, affecting handling and comfort.

Common Replacements

Alternator:

Rebuild or replacement of the alternator is a common maintenance item due to age.

📚 Vehicle History

Brand Heritage

Legacy:

Porsche, renowned for sports car engineering and racing success

Model Evolution

Introduction Year:

S Variant Years:

1978-1983

S4 Variant Years:

1984-1988

Gt Variant Years:

1987-1988

Gts Variant Years:

1990-1994

Production

Production End Year:

Manufacturing Location:

Zuffenhausen, Germany

🏆 Awards & Recognition

Recognitions

Design Awards:

While not specific awards, the 928's innovative design and engineering were highly acclaimed upon release.

Ratings

Performance Reviews:

Consistently praised for its blend of sports car performance and luxury GT comfort by automotive publications.