Vehicle Segment:
Front-engine, rear-wheel-drive luxury grand tourer.
Competitors:
Ferrari 412, Aston Martin Virage, BMW 8 Series (E31).
Design Philosophy:
Four-seater sports car with transatlantic appeal, blending performance with comfort and luxury.
Gts Enhancements:
Widened bodywork (flared fenders), revised aerodynamic elements, more powerful engine compared to earlier 928 variants.
Primary Focus:
Electrical System Diagrams and Troubleshooting
Secondary Focus:
Electrical Component Identification and Function
Estimated Pages:
Varies by specific edition, typically 100-250 pages for wiring diagrams and related troubleshooting guides.
Type:
Wiring Diagram Manual / Electrical Troubleshooting Manual
Language:
English (primarily), German (original technical terms)
Powertrain Electrical:
Engine Control Unit (ECU) wiring, fuel injection system wiring, ignition system wiring, starting system wiring, charging system wiring.
Chassis Electrical:
ABS (Anti-lock Braking System) wiring, power steering system wiring, suspension control wiring (where applicable).
Body Electrical:
Lighting (headlights, taillights, interior), power windows, power seats, central locking, mirrors, horn, wipers, washers, climate control system wiring, instrument cluster wiring, audio system wiring.
Safety Systems Electrical:
Airbag system wiring (if equipped), alarm system wiring.
Troubleshooting:
Diagnostic procedures for common electrical faults, pinpoint tests, symptom-based troubleshooting charts.
Component Location:
Diagrams indicating the physical location of electrical components, relays, fuses, and connectors.
Wiring Harness Identification:
Identification of individual wires, connectors, and their functions within the vehicle's wiring harnesses.
Fuse Relay Identification:
Identification and function of all fuses and relays within the vehicle's electrical system.
Depth:
Detailed schematic diagrams, component cross-references, voltage drop testing procedures, continuity testing, and circuit descriptions.
Engine Type:
Naturally Aspirated V8
Displacement:
5.4 liters (5396 cc)
Bore X Stroke:
100.0 mm x 70.8 mm
Compression Ratio:
10.4:1
Horsepower:
326 hp (240 kW) at 5700 rpm
Torque:
370 lb-ft (500 Nm) at 4000 rpm
Fuel Delivery:
Bosch Motronic 2.7 Fuel Injection and Ignition Control
Fuel Type:
Unleaded Premium Gasoline (91 octane or higher)
ECM Type:
Bosch Motronic (specific variant varies)
Type:
5-speed Manual Transaxle (G92/30 for 1993 models)
Type:
4-speed Automatic Transaxle (Tiptronic) (AWS 55-50 for 1992, AW-31 LS for 1993)
Transaxle Design:
Rear-mounted transaxle for near 50/50 weight distribution.
Tiptronic Operation:
Allows manual gear selection via gear shifter or steering wheel buttons (on select models).
Crash Test Performance:
While specific NHTSA/IIHS ratings for these exact years are not readily available, Porsche vehicles of this era were engineered with robust safety structures.
ABS:
Standard Anti-lock Braking System (ABS)
Traction Control:
Optional Porsche Traction Control (PTC)
Airbags:
Driver and passenger front airbags.
Seatbelts:
Three-point inertia-reel seatbelts with pretensioners.
Structure:
Reinforced chassis and safety cage construction.
Audio System:
Premium sound system with cassette player, often with CD changer option. Speaker quality and amplifier performance are key.
Climate Control:
Automatic climate control with manual override, dual-zone capability.
Cruise Control:
Standard electronic cruise control.
Telematics:
Basic, no modern connectivity features like Bluetooth or USB.
Oil Change:
Every 7,500 miles or annually, whichever comes first.
Major Service:
Timing belt replacement is critical and recommended every 60,000 miles or 5 years. This is a complex procedure on the V8 engine.
Engine Oil:
Synthetic SAE 5W-40 or 0W-40 (e.g., Mobil 1, Castrol Edge) meeting Porsche A40 specification.
Coolant:
Porsche approved G48 antifreeze (ethylene glycol based) mixed 50/50 with distilled water.
Brake Fluid:
DOT 4 (or DOT 5.1 for improved performance), replaced every 2 years.
Transmission Fluid Manual:
GL-5 SAE 75W-90 gear oil (e.g., Mobil 1 Synthetic Gear Oil).
Transmission Fluid Automatic:
Dexron III ATF or equivalent specified by Porsche.
Power Steering Fluid:
Pentosin CHF 11S or equivalent hydraulic fluid.
Electrical Gremlins:
Common for aging vehicles; faulty grounds, degraded wiring insulation, and failing relays/modules can cause intermittent issues.
Cooling System:
Can be prone to leaks from hoses, the radiator, and the auxiliary fan motors. The transaxle cooler can also be a point of failure.
Timing Belt:
Failure can lead to catastrophic engine damage. Regular replacement is crucial.
Fuel Pump:
Can become weak or fail, leading to poor performance or starting issues.
Oil Filter:
Genuine Porsche: 928.107.201.03 (or equivalent Mahle OX 32D).
Air Filter:
Genuine Porsche: 928.110.119.01 (or equivalent Mann-Filter C 37 190).
Founder:
Ferdinand Porsche
Legacy:
Renowned for engineering excellence, performance, and motorsport success.
Introduction:
The Porsche 928 was introduced in 1978 as a revolutionary departure from the 911.
Gts Introduction:
The GTS variant was introduced in 1992 as the final and most powerful iteration of the 928 platform.
Production Years:
1978-1995 (928 series)
Gts Production Years:
1992-1995 (GTS variant)
Manufacturing Location:
Stuttgart, Germany
Automotive Press:
Consistently praised for its engineering, comfort, and unique design by automotive journalists of its era.
Collectibility:
Highly collectible classic Porsche, especially the GTS variant, recognized for its V8 engine and V8 front-engine layout.
