Value Proposition:
Provides dealership-level technical information in a convenient digital format, enabling DIY owners to perform maintenance and repairs efficiently.
Advantage:
Offers comprehensive, vehicle-specific data including wiring schematics and detailed procedures, surpassing generic repair guides.
Format Convenience:
Single, easy-to-use PDF manual; printable pages; no greasy or torn paper manuals.
Diagnostic Capability:
Enables detailed diagnostics and troubleshooting, reducing reliance on professional mechanics for common issues.
Visual Aids:
Includes diagrams, illustrations, and blow-up image capability for clarity.
Primary Coverage:
1991 Chevrolet Corvette C4
Scope:
All models and all repairs A-Z
Estimated Page Count:
Extensive (Specific number not provided, but described as comprehensive)
Type:
Service and Repair Manual
Source:
Factory original service manual equivalent.
Engine Management:
Engine, Control System, Fuel Service Specifications, Emission Control, Ignition Starting Charging
Drivetrain:
Auto Transmission, Clutch, Manual Transmission, Transfer Propeller Shaft, Drive Shaft, Differential, Axle Suspension
Chassis And Brakes:
Tire & Wheel, Brake Control, Brake, Parking Brake, Steering Column, Power Steering
HVAC And Comfort:
Air Condition, Cruise Control
Safety And Restraint:
Suppl Restraint System, Seat Belt, Engine Immobilizer
Body And Interior:
Wiper & Washer, Door Lock, Windshield/Glass Mirror, Instrument Panel, Seat, Engine Hood/ Door, Exterior & Interior
Electrical And Electronics:
Electrical, Multiplex/ Can Communication, Meter Audio/Visual, Horn
Maintenance:
Scheduled maintenance procedures, fluid checks and changes, filter replacements.
Diagnosis And Troubleshooting:
System-specific diagnostic procedures, fault code interpretation, troubleshooting charts.
Repair And Rebuild:
Complete step-by-step instructions for component removal, disassembly, inspection, repair, and reassembly.
Component Replacement:
Detailed procedures for replacing major and minor components across all vehicle systems.
Electrical Troubleshooting:
Wiring schematics, circuit diagrams, and step-by-step troubleshooting for electrical faults.
Component Removal Installation:
Covers removal and installation of virtually all components, from simple items like wiper blades to complex ones like the engine and transmission.
Diagnostic Charts:
Features extensive diagnostic flowcharts for troubleshooting various symptoms and fault conditions.
Depth:
Factory level, highly detailed. Covers everything from basic maintenance to complex diagnostics and complete repairs.
Accuracy:
Vehicle-specific; identical to manuals used by dealership technicians.
Wiring Schematics Detail:
Includes comprehensive, detailed wiring schematics with color coding and component locations.
Searchability:
Searchable text within the PDF for quick information retrieval.
Printability:
All pages are printable. Users can print only necessary pages and diagrams, including enlarged copies of images.
Binding:
Digital (PDF format), no physical binding.
Paper Type:
N/A (Digital format)
Reader Software:
Adobe PDF Reader (Free)
Compression Software:
Winzip or similar (Free options available)
Operating Systems:
Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac compatible.
Engine Type:
5.7L V8 Tuned Port Injection (TPI)
Horsepower Est:
245 hp @ 4000 rpm (approx.)
Torque Est:
345 lb-ft @ 3200 rpm (approx.)
Fuel Delivery:
Sequential Port Fuel Injection (SFI) - Tuned Port Injection (TPI) system. The '91 model year saw a transition to SFI for many components while retaining the TPI intake manifold design.
Cooling Type:
Liquid-cooled
Oil Type:
API SG or SH Service Class; SAE 5W-30 Recommended (refer to manual for precise specification)
Ignition System:
Distributorless Ignition System (DIS) / Direct Ignition (DI) for some models or specific components.
Emission Controls:
Catalytic converter, EGR (Exhaust Gas Recirculation), Thermactor air injection system.
Crash Test NHTSA:
N/A for this model year (NHTSA ratings were less standardized for sports cars of this era).
Airbags:
Driver-side airbag (standard).
Seatbelts:
3-point inertia-reel seat belts.
ABS:
Anti-lock Braking System (ABS) standard.
Traction Control:
Selective Electronic Traction Control (ETC) available on some models/packages.
Audio System:
Factory Delco-Bose sound system, AM/FM stereo with cassette player. Optional CD player.
Display Technology:
Digital instrument cluster with LCD readouts for speed, RPM, and other data. Analog gauges for fuel and temperature.
Cruise Control:
Standard cruise control system.
Multiplex Communication:
Early forms of multiplexed communication systems used for various vehicle functions, detailed in the manual's electrical schematics.
Oil Change Interval Miles:
Typically 7,500 miles or 6 months, whichever comes first (refer to manual for exact interval based on driving conditions).
Air Filter Replacement:
Inspect every 15,000 miles, replace as needed.
Spark Plug Replacement:
Refer to manual; typically around 100,000 miles for platinum-tipped plugs if equipped, or earlier for standard plugs.
Coolant Type:
Dex-Cool (Orange) or conventional green ethylene glycol coolant (verify specific requirement in manual).
Brake Fluid Type:
DOT 3 or DOT 4 Hydraulic Brake Fluid (refer to manual for exact specification).
Power Steering Fluid:
Dexron-II or Dexron-III ATF (Automatic Transmission Fluid).
Common Issues Summary:
Potential issues include aging suspension bushings, climate control actuator failures, opti-spark distributor issues (later years), and electrical gremlins common to vehicles of this era. The manual addresses these with detailed troubleshooting.
Heritage Summary:
Chevrolet has a long-standing history in performance vehicles, with the Corvette being its flagship sports car since 1953, renowned for its performance and American engineering.
C4 Generation Context:
The C4 generation (1984-1996) marked a significant redesign for the Corvette, featuring a modern exterior, advanced chassis, and a focus on improved handling and performance. The 1991 model year saw further refinements and stylistic updates.
Production Years:
1984-1996 for C4 generation. 1991 specifically represents the seventh year of C4 production.
Assembly Plant:
Bowling Green, Kentucky, USA.
