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Porsche

1989 Porsche 928S4 Owners Manual

1989 Porsche 928S4 Owners Manual

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Vehicle data plateRef 280011
Brand
Porsche
Vehicle
Car
Models covered
928S4
Years
1989
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

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🏷️ Basic Information
Identification
Make:
Porsche
Model:
928
Trim:
S4
Year:
1989
👋 Introduction
Market Position
Positioning:
High-performance luxury grand tourer, positioned as a premium GT offering advanced technology and comfort.
Competitive Analysis
Competitors:
Ferrari 412, Aston Martin V8 Vantage, Jaguar XJS, BMW 8 Series (though the 8 Series arrived later, it represented a similar segment focus).
Key Features
Gran Turismo Focus:
Designed for comfortable high-speed touring with a powerful engine and refined interior.
Transaxle Layout:
Rear transaxle (transmission and differential) for optimal weight distribution (50/50).
Engine Placement:
Front-engine, rear-wheel drive configuration.
Innovative Design:
Aerodynamic styling, integrated bumpers, pop-up headlights.
📋 Manual Details
Coverage Areas
General Operation:
Comprehensive
Maintenance Schedule:
Detailed
Troubleshooting Guide:
Included
Safety Features:
Explained
Technical Specifications:
Extensive
Instrumentation Controls:
Detailed
Climate Control:
Explained
Audio System:
Operation
Lighting Systems:
Operation
Wheels Tires:
Information
Towing Information:
Included
Emergency Procedures:
Detailed
Page Count
Estimated Pages:
Approximately 300-400 pages (typical for this era and model)
Manual Type
Type:
Owner's Manual
Language
Language:
English
Format
Format:
Printed Booklet
📖 Manual Coverage
Systems Covered
Powertrain:
Engine, Fuel System, Exhaust System, Cooling System, Lubrication System
Transmission:
Automatic Transmission (Tiptronic-like features may be referenced in later manuals, but primarily automatic for 1989 S4)
Chassis:
Suspension, Steering, Brakes, Wheels, Tires
Electrical:
Battery, Charging System, Ignition System, Lighting, Fuses, Relays, Instruments, Wipers, Horn, Power Accessories
Body:
Doors, Locks, Windows, Seats, Interior Trim, Exterior Trim, Convertible Top (if applicable, but 928 is coupe), Body Panels
Climate Control:
HVAC System Operation and Controls
Safety Systems:
Seatbelts, Airbags (if equipped for the model year, though 1989 was early for full driver/passenger airbags as standard), ABS (Anti-lock Braking System)
Procedures Included
Basic Maintenance:
Oil Changes, Fluid Checks, Filter Replacements, Tire Pressure Checks
Tire Service:
Inflation, Rotation, Changing a Flat Tire (Spare location and jack operation)
Battery Care:
Jump Starting, Battery Maintenance
Washer Fluid Refill:
Location and Refilling
Wiper Blade Replacement:
Instructions
Fuse Replacement:
Fuse Box Locations and Fuse Identification
Emergency Operation:
Vehicle Start-up, Emergency Braking, Vehicle Recovery
Troubleshooting:
Common issues and diagnostic indicators
Technical Depth
Depth:
Owner-level maintenance and operation. Does not typically include in-depth diagnostic procedures or repair instructions found in service manuals.
📊 Manual Specifications
File Format
Type:
Physical Print
Print Quality
Quality:
Original Factory Print (may vary based on condition of used item)
Binding Type
Type:
Perfect Bound or Stapled Booklet
Paper Type
Type:
Standard Quality Paper with Glossy Cover
⚙️ Engine Specifications
Primary Engine
Engine Type:
V8
Displacement:
5.0 Liters (4973 cc)
Valvetrain:
SOHC (Single Overhead Camshaft), 4 valves per cylinder (20 valves total)
Bore X Stroke:
95.0 mm x 86.6 mm
Compression Ratio:
10.0:1
Performance
Horsepower:
320 hp (235 kW) @ 6000 rpm
Torque:
317 lb-ft (430 Nm) @ 4500 rpm
Fuel System
Induction:
Bosch LH-Jetronic Fuel Injection, Electronic Ignition (Distributorless ignition system often referred to as EDIS or similar on later models, but early 1989 S4 still had distributor for some markets/builds).
Fuel Type:
Unleaded Premium Gasoline (91 Octane or higher)
Fluid Capacity
Engine Oil:
Approx. 9.5 Liters (10 US Quarts) with filter
Fluid Specifications
Engine Oil Grade:
API SG or higher, SAE 5W-40 or 10W-40 (check manual for specific recommendations based on climate)
🔧 Transmission
Standard
Type:
4-speed Automatic (Tiptronic introduced later, but this manual covers the standard automatic).
Optional
Type:
5-speed Manual (rare, but was an option in some markets)
Features
Automatic Modes:
Likely included 'Economy' and 'Sport' modes to alter shift points.
Fluid Capacity
Automatic Transmission Fluid:
Approx. 10 Liters (10.6 US Quarts)
Fluid Specifications
Automatic Transmission Fluid Type:
Dexron III or equivalent (check manual for specific Porsche specification)
📐 Dimensions
Exterior
Length:
4650 mm (183.1 in)
Width:
1785 mm (70.3 in)
Height:
1280 mm (50.4 in)
Wheelbase:
2550 mm (100.4 in)
Weights
Curb Weight:
Approx. 1560 kg (3439 lbs)
Gross Vehicle Weight Rating:
Approx. 2050 kg (4519 lbs)
Wheels Tires
Standard Wheels:
16-inch Alloy Wheels
Optional Wheels:
17-inch Cup or Design 90 Wheels (common upgrade)
Standard Tire Size:
Front: 225/50VR16, Rear: 245/45VR16 (check manual for exact spec)
Bolt Pattern:
5x130 mm
🛡️ Safety Features
Ratings
Crash Test Data:
Limited public crash test data available for this specific year and model. Porsche's engineering focused on occupant protection through structural integrity. ABS was standard on S4.
Active Features
ABS:
Standard Anti-lock Braking System
Traction Control:
Traction control (ASR - Automatic Slip Regulation) was often an option or standard on later models, may be listed as optional for 1989.
Passive Features
Seatbelts:
Three-point inertia reel seatbelts with pretensioners
Airbags:
Driver's side airbag was optional or standard on late '89 models, check specific vehicle build. Passenger airbags were less common or optional.
Rollover Protection:
Reinforced A-pillars and roof structure
💡 Technology Features
Infotainment
Audio System:
Original factory stereo system (e.g., Blaupunkt or Becker), typically with AM/FM radio and cassette player. Options for CD changers might have been available.
Driver Assistance
ABS:
Anti-lock Braking System (ABS)
Connectivity
Navigation:
No integrated navigation system. Some later models might have offered aftermarket or dealer-installed options.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Typically every 7,500 - 10,000 miles or 12 months, whichever comes first (refer to manual for precise Porsche recommendation).
Major Service Interval:
Timing belt replacement every 60,000 miles or 5 years is critical for this engine. Other major services often around 30,000 miles.
Fluid Specifications
Coolant:
Porsche Approved Antifreeze/Coolant (e.g., G12 or equivalent with appropriate glycol concentration)
Brake Fluid:
DOT 4 or DOT 5.1 Synthetic Brake Fluid (check manual for specific type)
Power Steering Fluid:
Porsche Approved Power Steering Fluid or Pentosin CHF 11S (check manual)
Differential Fluid:
Hypoid gear oil, API GL-5, SAE 75W-90 (check manual)
Known Issues
Fuel Lines:
Degradation of rubber fuel lines and hoses due to age and heat is a common concern, requiring regular inspection and replacement.
Cooling System:
Leaking coolant pipes, particularly the under-hood runs, and radiator leaks can occur. The rear-mounted radiator can be labor-intensive to service.
Electrical System:
Aging wiring insulation, problematic window regulators, HVAC blower motor failures, and issues with the instrument cluster electronics are not uncommon.
Suspension:
Wear in bushings, control arms, and potential failure of the aluminum suspension components leading to alignment issues.
Timing Belt:
Critical maintenance item. Failure to replace on schedule leads to catastrophic engine damage.
📚 Vehicle History
Brand Heritage
Legacy:
Porsche's reputation for engineering excellence, performance, and build quality established with models like the 911.
Model Evolution
Genesis:
Introduced in 1977 as a front-engine, rear-wheel-drive alternative to the 911, designed to be more comfortable and practical for everyday use and grand touring.
S4 Introduction:
The S4 variant (introduced for the 1987 model year in North America) represented a significant update with a more powerful engine, improved aerodynamics, and refined suspension.
1989 Updates:
Continued the S4 evolution with minor refinements, often including upgraded electronics and interior features compared to earlier models. The 1989 model year is a late production example of the S4 generation.
Production
Production Years:
1977-1995 (928 model line)
S4 Production Years:
1987-1991
Manufacturing Location:
Stuttgart, Germany
🏆 Awards & Recognition
Recognitions
Performance Awards:
Frequently lauded by automotive press for its V8 power, handling, and GT capabilities, often included in 'best sports car' or 'most advanced car' lists of its era.
Ratings
Comfort Ratings:
Praised for its comfortable ride and well-appointed interior, distinguishing it from more track-focused sports cars.

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Check the model year and engine before you buy

Manufacturers change procedures, wiring and part numbers between model years and engine options. If your VIN plate shows a year or engine code that is not listed on the data plate above, contact us with the model, year and VIN and we will confirm coverage before you order.

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