🏷️ Basic Information

Make:

Audi

Model:

100

Model Generation:

C4

Model Code:

4A

Model Year:

1993

👋 Introduction

Segment:

Executive Sedan / Mid-size Luxury Sedan

Key Competitors:

BMW 5 Series (E34), Mercedes-Benz E-Class (W124), Lexus LS 400 (though the 100 was positioned slightly below), Cadillac DeVille

Design Philosophy:

Emphasis on comfort, refinement, solid build quality, and sophisticated engineering, particularly the availability of Quattro AWD.

Notable Variants:

Available as sedan (4-door) and Avant (wagon). Offered with various engine options including 5-cylinder inline engines and V6 engines.

📋 Manual Details

Comprehensive Coverage:

All Models & All Repairs A-Z

Estimated Page Count:

Extensive (specific page count not provided but typical for this era of factory manual)

Type:

Service and Repair Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine:

Complete diagnostics, overhaul, tuning, fuel system (EFI), ignition system, cooling system, exhaust system

Transmission:

Manual and Automatic transmission diagnosis, repair, overhaul, fluid specifications

Drivetrain:

Front-wheel drive (FWD) and Quattro all-wheel drive (AWD) systems, differentials, driveshafts, CV joints

Suspension:

Front and rear suspension systems, components (struts, shocks, control arms, bushings), alignment specifications

Steering:

Power steering system diagnosis, repair, components (rack and pinion, pump), fluid specifications

Brakes:

Hydraulic brake system, ABS (Anti-lock Braking System) diagnosis and repair, disc and drum brake service, fluid specifications

Electrical:

Complete wiring diagrams, starting and charging system, lighting system, instrument cluster, power accessories, diagnostic trouble codes (DTCs)

Body And Chassis:

Body panel repair, interior trim removal and installation, door mechanisms, glass replacement, chassis lubrication

Climate Control:

Air conditioning system (R134a compliant or pre-conversion), heating system, ventilation, component testing

Fuel System:

Fuel injection (Bosch Motronic), fuel pump, injectors, fuel pressure, evaporative emissions control (EVAP)

Exhaust System:

Exhaust manifold, catalytic converter, mufflers, pipes, mounting hardware

Routine Maintenance:

Oil changes, filter replacements, spark plug replacement, fluid level checks and top-offs, tire rotation, brake pad inspection

Troubleshooting:

Diagnostic procedures for common and uncommon issues, symptom-based troubleshooting guides

Repair Procedures:

Step-by-step instructions for component removal, installation, and adjustment

Rebuilding Procedures:

Detailed guides for engine, transmission, and differential rebuilds

Diagnostics:

Wiring diagrams for electrical systems, fault code retrieval and interpretation (OBD-I)

Depth:

Factory-level, from basic maintenance to complete overhauls and complex diagnostics

📊 Manual Specifications

Format:

PDF (Portable Document Format)

Searchability:

Likely text-searchable (depending on original scan quality)

Quality:

Professional scan quality, suitable for printing individual pages or sections

Type:

N/A (Digital download)

Type:

N/A (Digital download)

⚙️ Engine Specifications

Engine Options:

2.8L (2793cc) V6 SOHC (AAA engine code) and 2.3L (2309cc) 5-cylinder SOHC (NG/NF/AAR engine codes)

Horsepower V6:

Approx. 172 hp @ 5500 rpm (for 2.8L AAA engine)

Torque V6:

Approx. 184 lb-ft @ 3300 rpm (for 2.8L AAA engine)

Horsepower 5Cyl:

Approx. 130 hp @ 5500 rpm (for 2.3L AAR engine)

Torque 5Cyl:

Approx. 137 lb-ft @ 3000 rpm (for 2.3L AAR engine)

Injection Type:

Bosch Motronic electronic fuel injection (EFI)

Type:

Electronic ignition with distributor (on 5-cylinder) or distributorless ignition system (DIS) on some V6 models.

System:

OBD-I (On-Board Diagnostics - first generation)

🔧 Transmission

Type:

5-speed Manual Transmission

Type:

4-speed Automatic Transmission (ZF 4HP22)

AWD Option:

Quattro permanent all-wheel drive available on most models, providing enhanced traction and stability.

Automatic Transmission Fluid:

G 052 162 A1 (or equivalent ATF specification for ZF 4HP22 - typically Dexron III compatible)

Manual Transmission Oil Capacity:

Approximately 1.7 - 1.9 liters (specific to gearbox type)

Automatic Transmission Oil Capacity:

Approximately 3.0 - 3.5 liters for a fluid change, up to 7.5 liters for a full overhaul

📐 Dimensions

Length:

Approx. 190.5 inches (4839 mm)

Width:

Approx. 70.5 inches (1791 mm)

Height:

Approx. 55.1 inches (1400 mm)

Wheelbase:

Approx. 109.4 inches (2780 mm)

Curb Weight:

Approx. 3300-3700 lbs (1497-1678 kg), depending on engine and drivetrain

Trunk Volume Sedan:

Approximately 16.0 cubic feet (0.45 m³)

Cargo Volume Avant:

Significantly more with rear seats folded, offering practical wagon utility.

🛡️ Safety Features

NHTSA Rating 1993:

Specific NHTSA ratings for 1993 are not readily available in a standardized format, but the C4 chassis was known for solid construction.

ABS:

Standard or optional Anti-lock Braking System (ABS) depending on trim and market. The manual will detail its operation and servicing.

Traction Control:

Traction control (ASR - Anti-Schlupf-Regelung) was available on some models, often linked with Quattro.

Airbags:

Driver's side airbag was standard from 1993. Passenger airbag became available later in the generation.

Seatbelts:

Three-point inertia-reel seatbelts with front-seat pretensioners.

Body Structure:

Designed with a robust unibody structure with integrated safety cage and crumple zones.

💡 Technology Features

Audio System:

Factory Audi sound systems, often with cassette player and optional CD changer. Radio code may be required after battery disconnect.

Cruise Control:

Electronic cruise control was widely available.

Remote Keyless Entry:

Became available as an option towards the end of the C4 generation, but not standard on all models.

🔧 Maintenance

Oil Change Interval:

Typically every 7,500 miles (12,000 km) or 12 months, whichever comes first, using synthetic or semi-synthetic oil.

Timing Belt Replacement:

Critical for 5-cylinder engines. Typically every 60,000 miles (96,000 km) or 4 years. V6 models may have timing chains or belts depending on specific engine variants, but the manual will confirm.

Spark Plug Replacement:

Typically every 30,000 miles (48,000 km) or as specified for the particular spark plug type.

Engine Oil Type:

API SG/SH, ACEA A2-96 or A3-96. Viscosity typically 5W-40 or 10W-40 (check manual for specific engine and temperature range).

Coolant Type:

G 11 (Blue or Green) ethylene glycol-based coolant. Mix 50/50 with distilled water.

Brake Fluid Type:

DOT 4 brake fluid.

Power Steering Fluid:

Pentosin CHF 11 S or equivalent hydraulic fluid.

Engine Oil Capacity V6:

Approx. 4.5 - 5.0 liters with filter change (2.8L V6).

Engine Oil Capacity 5Cyl:

Approx. 4.0 - 4.5 liters with filter change (2.3L 5-cyl).

Coolant Capacity:

Approx. 7.5 - 8.5 liters (depending on engine and presence of auxiliary cooler).

Electrical Gremlins:

Common on vehicles of this age; issues with door lock actuators, window regulators, and dashboard warning lights can occur. Wiring harness degradation.

Suspension Wear:

Control arm bushings, tie rod ends, and ball joints are common wear items.

Cooling System:

Plastic coolant flange on V6 engines can become brittle and leak. Radiator hoses can degrade over time.

ABS Sensors:

ABS wheel speed sensors can fail, leading to ABS warning lights.

Oil Leaks:

Valve cover gaskets, oil pan gaskets, and crankshaft/camshaft seals can develop leaks.

📚 Vehicle History

Audi Legacy:

Audi has a long history of engineering excellence, particularly known for its Quattro all-wheel-drive system and innovative technologies like front-wheel drive adoption.

C4 Generation Introduction:

The C4 generation of the Audi 100 (and its sibling, the Audi 200) was introduced in 1990 (as a 1991 model year in Europe) and replaced the C3 generation. The 1993 model year represents a refinement of this platform.

Manufacturing Location:

Primarily produced in Ingolstadt, Germany.

C4 Platform:

1990/1991 - 1994 (followed by the Audi A6 C5 generation).

🏆 Awards & Recognition

Industry Accolades:

While specific awards for the 1993 model are not widely publicized, the C4 generation was generally praised for its refinement, build quality, and driving dynamics, especially with Quattro.