🏷️ Basic Information Identification Make: Chevrolet Model: Impala Year: 2004 Generation Generation Code: Epsilon II Codes Vin Prefix: 1G 👋 Introduction Market Position Segment: Full-size sedan, competing with Ford Crown Victoria, Toyota Avalon, Chrysler 300M. Competitive Analysis Strengths: Spacious interior, comfortable ride, strong V6 and V8 engine options for its class, good value proposition. Key Features Platform: GM Epsilon platform, shared with Opel Vectra, Saab 9-3. Design: Distinctive styling, often criticized for being somewhat bland by automotive critics but appreciated for its straightforward design by consumers. 📋 Manual Details Coverage Areas Primary Focus: Service, Repair, Maintenance Additional Focus: Diagnostics, Troubleshooting, Wiring Diagrams Page Count Estimated Pages: Extensive (digital format, equivalent to over 2000 printed pages) Manual Type Type: Official Service and Repair Manual Software Language Language: English Format Format: PDF Download (Digital Access) 📖 Manual Coverage Systems Covered Powertrain: Engine, Fuel System, Cooling System, Exhaust System, Drivetrain (Front-Wheel Drive), Transmission (Automatic) Chassis: Suspension (Front & Rear), Steering System, Brakes (Front & Rear, ABS) Electrical: Body Control Module (BCM), Powertrain Control Module (PCM), Lighting, Instrumentation, HVAC Controls, Audio System, Power Accessories, SRS (Airbag) System, Anti-theft System Body: Exterior Body Panels, Doors, Windows, Interior Trim, Seats, Convertible Top (if applicable) Procedures Included Maintenance: Oil Change, Filter Replacement, Fluid Checks & Top-offs, Spark Plug Replacement, Belt Inspection & Replacement, Tire Rotation Repair: Engine Component Replacement (e.g., alternator, starter, water pump), Brake Pad & Rotor Replacement, Suspension Component Replacement (e.g., struts, ball joints), HVAC System Repair, Electrical Component Diagnosis & Replacement, Drivetrain Component Service Diagnostics: Diagnostic Trouble Code (DTC) retrieval and interpretation, Component testing, Circuit diagnostics, Symptom-based troubleshooting Suspension And Steering Repair: Detailed procedures for replacement of struts, shocks, ball joints, tie rod ends, power steering pump, and steering rack. Brake System Service: Complete guide to brake pad and rotor replacement, caliper service, and brake bleeding for ABS-equipped vehicles. Technical Depth Depth: Comprehensive, from routine maintenance to major component overhaul and electrical system diagnostics. Special Tools: Identification of specialized tools required for specific repairs. Wiring Diagrams: Detailed electrical wiring diagrams for all major systems. 📊 Manual Specifications File Format Format Details: Searchable PDF, printable pages, accessible via web browser on PC, laptop, smartphone, tablet. Print Quality Quality: High-resolution, professional scans of original factory documentation. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 3.8L V6 OHV (L36) Displacement: 3791 cc Bore X Stroke: 96.5 mm x 86.7 mm Compression Ratio: 9.5:1 Horsepower: 200 hp @ 5200 rpm Torque: 230 lb-ft @ 3600 rpm Fuel System: Sequential Electronic Fuel Injection (SEFI) Secondary Engine Engine Type: 3.4L V6 OHV (L32) Displacement: 3350 cc Horsepower: 180 hp @ 5200 rpm Torque: 205 lb-ft @ 4000 rpm Performance Acceleration 0 60: Approx. 8.5-9.5 seconds (3.8L V6) Fuel System Fuel Type: Unleaded Gasoline Recommended Octane: 87 (Octane Rating) 🔧 Transmission Standard Transmission Type: 4-speed Automatic (4T65-E) Optional Optional Transmission: N/A for 2004 model year Features Transmission Features: Lock-up torque converter, electronic controls, overdrive. 📐 Dimensions Exterior Length: 197.9 inches Width: 72.1 inches Height: 57.4 inches Wheelbase: 110.5 inches Weights Curb Weight Min: 3530 lbs (3.4L V6) Curb Weight Max: 3640 lbs (3.8L V6) 🛡️ Safety Features Ratings NHTSA Front Impact: 5 Stars (Driver), 4 Stars (Passenger) IIHS Side Impact: Good Active Features ABS: Standard (Anti-lock Braking System) Passive Features Airbags: Standard front airbags; Optional side-impact airbags. Seatbelts: Three-point seatbelts with pretensioners. 💡 Technology Features Infotainment Audio System: Available premium Bose audio system, CD player, AM/FM radio. Driver Assistance Cruise Control: Standard on most trims Connectivity Features: Basic connectivity features of the era; no Bluetooth or advanced smartphone integration. 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 miles or 6 months (using synthetic blend oil, refer to manual for specific recommendations). Tire Rotation Interval: Every 7,500 miles Spark Plug Replacement: Typically 100,000 miles for Ecotec 3.4L V6 (check manual for specific engine). Fluid Specifications Engine Oil Type: SAE 5W-30 (API Certified, GM spec GM6094M) Coolant Type: Dex-Cool Extended Life Antifreeze/Coolant (GM Part No. 12346290 or equivalent) Transmission Fluid Type: Dexron VI Automatic Transmission Fluid (GM Part No. 88863400 or equivalent) Brake Fluid Type: DOT 3 Known Issues Common Problems: Intake manifold gasket leaks, rear main seal leaks (3.8L V6), power steering pump leaks, HVAC blend door actuator failure, coolant leaks from Dex-Cool issues, some electronic module failures. Troubleshooting Tips: The manual provides detailed diagnostic procedures for these and other common issues. 📚 Vehicle History Brand Heritage Chevrolet Legacy: Chevrolet, founded in 1911, has a long history of producing reliable and accessible vehicles for the American market. Model Evolution Impala Lineage: The Impala nameplate has a storied history in Chevrolet's lineup, evolving from a premium full-size car in the 1960s to a more mainstream offering in later generations. Production Manufacturing Location: Oshawa, Ontario, Canada Production Period: This generation of...