The Impala, produced in 2004, is a full-size sedan built on the GM Epsilon platform. Known for its spacious interior, comfortable ride, and strong V6 engine options, it offered a compelling value proposition in its segment, competing with models like the Ford Crown Victoria and Toyota Avalon. This generation of Impala, manufactured in Oshawa, Ontario, Canada, featured a front-wheel-drive layout and a straightforward design appreciated by consumers. Safety features included standard front airbags, optional side airbags, and Anti-lock Braking System (ABS), contributing to its respectable safety ratings. This comprehensive service and repair manual provides detailed information for the maintenance, diagnostics, and repair of the 2004 Impala. Covering all major systems, including the powertrain, chassis, and electrical components, it offers step-by-step procedures for routine maintenance such as oil changes and tire rotations, as well as in-depth guidance for component replacement and troubleshooting. With extensive coverage including wiring diagrams, technical specifications, and diagnostic trouble code interpretation, this manual serves as an essential resource for owners and technicians alike to ensure the optimal performance and longevity of the vehicle. 🏷️ 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...