🏷️ Basic Information

Make:

Chevrolet

Model:

Corvette

Generation:

C4

Model Year:

1990

Chassis Code:

C4

👋 Introduction

Positioning:

Direct replacement for dealership technician manuals, offering expert-level repair information for the enthusiast or independent mechanic.

Advantage:

Vehicle-specific, not generic. Provides the exact information used by factory-trained technicians, ensuring accuracy and completeness.

Ease Of Use:

Single, easy-to-use PDF manual eliminating the need to flip through multiple physical books. Printable pages for convenience in the workshop.

📋 Manual Details

Primary Coverage:

All models and all repairs A-Z for the 1990 Chevrolet Corvette C4

Estimated Page Count:

Estimated 2000+ pages (typical for comprehensive factory service manuals)

Type:

Factory Service and Repair Manual

Language:

English

Format:

Digital (PDF)

📖 Manual Coverage

Engine Mechanical:

Engine assembly, disassembly, diagnosis, rebuilding, component specifications

Engine Control System:

ECM diagnostics, sensors, actuators, fuel injection, ignition timing, emission controls

Fuel System:

Fuel pump, injectors, lines, tank, pressure regulation, service specifications

Emission Control:

EGR system, PCV system, evaporative emissions, catalytic converter, diagnostics

Cooling System:

Radiator, thermostat, water pump, fan, hoses, coolant specifications

Lubrication System:

Oil pump, oil filter, oil pressure, oil specifications

Ignition Starting Charging:

Spark plugs, coils, distributor, battery, alternator, starter motor, wiring

Automatic Transmission:

Diagnosis, overhaul, fluid specifications, electronic controls (if applicable)

Manual Transmission:

Diagnosis, overhaul, clutch operation, fluid specifications

Drivetrain:

Driveshaft, U-joints, differential, axle shafts, wheel bearings

Suspension System:

Front and rear suspension components, alignment, shocks, springs, bushings

Steering System:

Steering column, power steering pump, rack and pinion, tie rods, alignment

Brake System:

Front and rear brakes, rotors, pads, calipers, lines, ABS system, parking brake

Wheel And Tire:

Tire specifications, wheel torque, balancing, rotation

Climate Control HVAC:

Air conditioning system, heater, ventilation, refrigerant, diagnosis

Supplemental Restraint System Srs:

Airbag system diagnosis and service (cautionary procedures emphasized)

Seat Belts:

Seat belt operation, inspection, and replacement

Engine Immobilizer:

If equipped, system operation and diagnosis

Cruise Control:

System diagnosis and repair

Wiper And Washer System:

Wiper motor, blades, washer pump, fluid reservoir

Door Lock System:

Power door locks, manual locks, diagnosis

Meter Audio Visual:

Instrument cluster, gauges, radio system, speakers

Horn System:

Horn operation, relay, switch

Glass And Mirrors:

Windshield, side glass, rear glass, mirrors, replacement

Instrument Panel:

Removal, installation, diagnosis of dashboard components

Seats:

Seat adjustment mechanisms, trim, diagnosis

Body And Exterior:

Hood, doors, panels, trim, exterior lighting

Interior Trim:

Door panels, console, headliner, carpet, diagnosis

Electrical System:

Wiring diagrams, component testing, fuses, relays, power distribution

Multiplex Can Communication:

Diagnosis and understanding of multiplexed systems (if applicable to specific components)

Maintenance Procedures:

Scheduled maintenance, fluid changes, filter replacements, inspections

Diagnostic Procedures:

Troubleshooting guides, symptom-to-cause analysis, diagnostic trouble codes (DTCs)

Repair Procedures:

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

Rebuilding Procedures:

Comprehensive instructions for engine, transmission, and other major component overhauls

Wiring Schematics:

Detailed electrical system wiring diagrams for all circuits

Illustrations And Diagrams:

Extensive use of diagrams, illustrations, and exploded views for clarity

Depth:

Factory-level, covering everything from basic maintenance to complete vehicle overhaul and advanced diagnostics

📊 Manual Specifications

Compatibility:

Windows Vista (32/64-bit), XP, ME, 98, NT, 2000, and Mac compatible

Printability:

All pages are printable, with the ability to enlarge images

Binding:

Digital PDF format (eliminates physical binding issues)

Digital Format Benefit:

No greasy or torn paper manuals; safe storage on PC

Required Software:

Adobe PDF Reader and Winzip (free online)

⚙️ Engine Specifications

Engine Type:

5.7L L98 V8 (Tunable Port Injection - TPI)

Horsepower:

245 hp @ 4,000 rpm (approximate)

Torque:

345 lb-ft @ 3,200 rpm (approximate)

Injection System:

Tuned Port Injection (TPI)

Fuel Type:

Unleaded Gasoline (87 octane minimum recommended, 91+ for optimal performance)

🔧 Transmission

Transmission Type:

4-speed Automatic Transmission (4L60/700-R4)

Transmission Type Optional:

7-speed Manual Transmission (ZF S6-40)

Automatic Transmission Fluid:

Dexron-III / Mercon automatic transmission fluid (ATF)

📐 Dimensions

Wheelbase:

96.2 inches

Length:

178.5 inches

Width:

70.4 inches

Height:

46.3 inches

Curb Weight:

Approximately 3200-3300 lbs (varies by option)

🛡️ Safety Features

Crash Test Data:

Information on structural integrity and occupant protection as per 1990 safety standards (manual will detail specific occupant safety systems).

ABS:

Anti-lock Braking System (ABS) standard on all models.

Airbags:

Driver's side airbag standard.

Seat Belts:

Three-point inertia-reel seat belts.

💡 Technology Features

Audio System:

Factory AM/FM stereo with cassette player and optional CD player. Speaker configuration varies by trim.

Cruise Control:

Electronic cruise control system.

Diagnostic Ports:

OBD-I diagnostic connector for engine management system.

🔧 Maintenance

Oil Change Interval:

Every 3,000 - 5,000 miles or 6 months (refer to manual for specific conditions and oil type).

Transmission Fluid Change:

Every 30,000 - 60,000 miles (refer to manual for specific conditions).

Coolant Change:

Every 24,000 miles or 2 years.

Engine Oil Viscosity:

API Service SG or SH, SAE 5W-30 or 10W-30 (refer to manual for specific ambient temperature recommendations).

Coolant Type:

GM 50/50 coolant or equivalent.

Brake Fluid Type:

DOT 3 brake fluid.

Common Wear Items:

Exhaust manifold gaskets, fuel injectors, fuel pump, climate control blend doors, power steering hoses.

Electrical Gremlins:

A common characteristic of vehicles of this era; manual details diagnostic procedures for intermittent electrical faults.

📚 Vehicle History

Heritage:

Chevrolet's flagship sports car, renowned for performance and American automotive engineering.

C4 Generation:

The C4 generation (1984-1996) marked a significant departure with modern styling and improved performance. The 1990 model year brought the introduction of the LT5 engine in the ZR-1 variant (though this manual covers the standard L98 for the general C4 model).

Production Year:

1990

🏆 Awards & Recognition

Performance Recognition:

Consistently recognized for its performance capabilities and handling, a benchmark in American sports car design.