🏷️ Basic Information Identification Make: Audi Model: S4 Year: 1993 Vehicle Platform: B4 (Typ 8A/8C) Codes Chassis Code: Typ 8A (Sedan/Avant), Typ 8C (Coupe) 👋 Introduction Market Position Market Position: The 1993 Audi S4 (B4 platform) represented a high-performance, luxury compact executive sedan and wagon, positioned as a potent driver's car with advanced technology for its era. It competed with performance variants of models like the BMW M3 (E36), Mercedes-Benz 190E 2.3-16/2.5-16 Evolution, and Ford Sierra Cosworth. Competitive Analysis Competitive Analysis: The S4 offered a blend of Quattro all-wheel drive, turbocharged power, and Audi's signature build quality. Its performance focus, particularly the turbocharged inline-5 engine, set it apart in a segment often dominated by naturally aspirated engines. The availability of the Avant (wagon) body style also provided a unique niche for performance-oriented families. Key Features Key Features: 2.2L turbocharged inline-5 engine, Quattro all-wheel drive, 5-speed manual transmission (standard), Sport-tuned suspension, performance-oriented interior and exterior styling, advanced (for the time) electronic engine management. 📋 Manual Details Coverage Areas Coverage Areas: Complete Wiring Diagram Page Count Page Count: Unknown (Product description implies comprehensive, typically 50-200 pages for wiring diagrams) Manual Type Manual Type: Wiring Diagram Manual / Electrical Troubleshooting Manual (ETM) Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Systems Covered: Engine Management (ECU), Ignition System, Fuel Injection System, Lighting (Headlights, Taillights, Interior), Instrumentation Cluster, HVAC Controls, Power Windows, Power Locks, Power Mirrors, Sunroof, Audio System, ABS (if equipped), Airbag System (if equipped), Wiper/Washer System, Horn, Central Locking, Alarm System (if equipped), Cruise Control Procedures Included Procedures Included: Component identification, Pinouts, Wire colors, Fuse/Relay locations and assignments, Circuit tracing, Diagnostic troubleshooting of electrical faults, Repair of wiring harnesses, Component testing Technical Depth Technical Depth: Advanced Diagnostic and Repair Level. Detailed schematics for tracing electrical circuits and diagnosing faults. Focus on understanding component interconnections and signal paths. 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality: High Resolution (suitable for clear printing of diagrams and text) Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download - Printable) Compatibility Compatibility: All Versions of Windows & Mac Requirements Requirements: Adobe PDF Reader Downloadability Downloadability: YES (Instant Download) ⚙️ Engine Specifications Primary Engine Primary Engine: 2.2L (2226cc) inline-5 turbocharged DOHC Engine Code Engine Code: 3B (preliminary, actual may vary slightly by market and VIN) Performance Horsepower: 227 hp @ 5900 rpm (approx.) Torque: 243 lb-ft @ 1950 rpm (approx.) Fuel System Fuel System: Bosch Motronic Electronic Fuel Injection (EFI) with Turbocharging Turbocharger Turbocharger: Garrett T3/T04 Hybrid or similar, Intercooled Ignition System Ignition System: Electronic Ignition with Knock Control Bore X Stroke Bore X Stroke: 80.5 mm x 95.7 mm (approx.) Compression Ratio Compression Ratio: 9.0:1 (approx.) 🔧 Transmission Standard Standard Transmission: 5-speed Manual Transmission Optional Optional Transmission: 4-speed Automatic Transmission Features Drivetrain: Quattro All-Wheel Drive (Permanent) Differential Type: Torsen Center Differential, Locking Rear Differential (often standard on S4) 📐 Dimensions Exterior Length: Sedan: ~4700 mm, Avant: ~4750 mm (approx.) Width: ~1710 mm (approx.) Height: ~1390 mm (Sedan), ~1440 mm (Avant) (approx.) Weights Curb Weight: Sedan: ~1540 kg, Avant: ~1580 kg (approx.) Wheelbase: ~2610 mm (approx.) 🛡️ Safety Features Ratings Safety Ratings: N/A (Specific NHTSA/Euro NCAP ratings for this exact model year/variant are not readily available, but European safety standards of the era were high for luxury vehicles). Active Features Active Features: Anti-lock Braking System (ABS), Quattro All-Wheel Drive Passive Features Passive Features: Front Crumple Zones, Side Impact Beams, Driver and Passenger Airbags (standard on some markets/late production), Three-point Seatbelts with Pretensioners 💡 Technology Features Infotainment Infotainment System: Factory Audi Chorus or Concert cassette radio with AM/FM tuner. Optional CD changer. Driver Assistance Driver Assistance Features: Cruise Control, ABS (Anti-lock Braking System). Connectivity Connectivity Options: N/A (No modern connectivity features like Bluetooth or USB; basic antenna input for radio). Climate Control Climate Control System: Manual or automatic climate control systems were available, featuring A/C and heating. 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 miles or 12 months (synthetic oil recommended), check manual for specific recommendations. Timing Belt Replacement: Every 60,000 miles or 5 years (critical due to interference engine design). Spark Plug Replacement: Every 30,000 miles (recommendations may vary). Fluid Specifications Engine Oil Type: API SG/SH or ACEA A2-96/A3-98, SAE 5W-40 or 10W-40 (consult manual for specific viscosity based on temperature). Engine Oil Capacity: 5.5 Liters (approx. 5.8 US Quarts) with filter change. Coolant Type: G12 Plus (or equivalent ethylene glycol based coolant with G11 specification) - Pink or Red color. Transmission Fluid Type: Manual: GL-4 SAE 75W-90. Automatic: ATF Dexron II/III or equivalent. Brake Fluid Type: DOT 3 or DOT 4 Known Issues Known Issues: Distributor O-ring leaks, coolant flange leaks (common on Audi 5-cylinders), turbocharger wear/failure, intercooler hose degradation, fuel pump failure, window regulator issues, ABS sensor failures, ignition coil failures. Part...