🏷️ Basic Information

Make:

Chevrolet

Model:

Impala

Year:

2004

Generation:

Ninth Generation (W-Body)

Chassis Code:

W-Body

👋 Introduction

Target Audience:

DIY Mechanics, Independent Repair Shops, Chevrolet Enthusiasts

Competitor Manuals:

Replaces generic Haynes or Chilton manuals with dealership-level accuracy and detail.

Convenience:

Single PDF file for easy navigation, searchable content, printable pages, avoids physical wear and tear of traditional manuals.

Authenticity:

Directly replicates the information used by certified Chevrolet technicians.

📋 Manual Details

All Models:

Yes

Repair Scope:

A-Z (All Repairs)

Model Variations Covered:

Covers all trim levels and engine configurations for the 2004 Chevrolet Impala.

Estimated Page Count:

Extensive (Thousands of pages typical for full factory service manuals)

Manual Classification:

Factory Service Manual / Repair Manual

Language:

English

File Format:

PDF

📖 Manual Coverage

Powertrain:

Engine, Transmission (Automatic & Manual), Fuel System, Emission Control, Cooling System, Lubrication System, Ignition System, Starting & Charging System

Chassis:

Suspension, Steering (Power Steering, Steering Column), Brakes (Brake Control, Parking Brake), Wheels & Tires, Drive Axle, Transfer Case (if applicable), Driveshaft, Differential

Electrical Electronic:

Electrical System, Multiplex/CAN Communication, Wiring Schematics, Instrument Panel, Meter, Audio/Visual, Horn, Cruise Control, Engine Immobilizer, Wiper & Washer System, Door Locks

Body Comfort:

Body Exterior & Interior, Engine Hood/Door, Seats, Windshield/Glass/Mirror, Air Conditioning System, Supplemental Restraint System (SRS), Seat Belts

Maintenance:

Scheduled Maintenance, Fluid Checks and Replacements, Filter Replacements, Belt Inspections, Tune-ups

Diagnostics:

Troubleshooting Guides, Diagnostic Trouble Codes (DTCs), Symptom-Based Diagnostics, Electrical System Diagnostics

Repair Rebuild:

Component Removal and Installation, Engine Rebuild Procedures, Transmission Overhaul, Brake System Repair, Suspension Component Replacement, Electrical Component Diagnosis and Repair

Technical Specifications:

Torque Specifications, Fluid Types and Capacities, Electrical Schematics, Diagnostic Data, Component Dimensions

Wiring Schematics:

Includes detailed, system-specific wiring diagrams for all major electrical components and circuits, essential for troubleshooting electrical faults.

Depth Of Information:

Factory-level, comprehensive, covering basic maintenance to complex diagnostics and complete vehicle repairs. Includes detailed illustrations and schematics.

Diagnostic Tools:

Information on using diagnostic scan tools (OBD-II) and specific GM diagnostic procedures for powertrain control modules (PCM) and other electronic modules.

📊 Manual Specifications

PDF Quality:

High-resolution, enabling clear viewing and printing of diagrams and text. Searchable text functionality is highly probable.

Platform Compatibility:

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

Printability:

All pages are printable, allowing users to print specific sections or the entire manual as needed.

Image Enhancement:

Ability to blow up images for enlarged viewing and printing, facilitating detailed inspection of diagrams and illustrations.

Binding:

Not Applicable (Digital PDF Format)

Paper Type:

Not Applicable (Digital PDF Format)

⚙️ Engine Specifications

Engine Options 2004:

3.8L V6 (L36/Series II) and 3.4L V6 (L32/3400 SFI)

3.8L V6 Horsepower:

Approximately 200-205 hp (depending on specific tune)

3.8L V6 Torque:

Approximately 225-230 lb-ft (depending on specific tune)

3.4L V6 Horsepower:

Approximately 180 hp

3.4L V6 Torque:

Approximately 205 lb-ft

Fuel Delivery:

Sequential Fuel Injection (SFI)

Fuel Type:

Unleaded Gasoline (87 Octane Recommended)

Coolant Type:

GM P/N 1052876 or 12378353 (Orange/Dex-Cool compatible, ethylene glycol-based) or equivalent meeting GM6277M specification.

Engine Oil Type:

SAE 5W-30 Synthetic Blend or Full Synthetic, API Certified

Engine Oil Capacity:

Approx. 4.5 quarts (4.3 L) with filter for 3.8L; Approx. 4.0 quarts (3.8 L) with filter for 3.4L

🔧 Transmission

Transmission Type Standard:

4-Speed Automatic (4T65-E for 3.8L, 4T60-E for 3.4L)

Transmission Type Optional:

Manual transmission was not a common option for the 2004 Impala in most markets.

Automatic Transmission Features:

Electronically controlled, adaptive shift logic, torque converter lock-up.

Automatic Transmission Fluid Type:

Dexron III/VI ATF (GM P/N 12378515 or equivalent)

Automatic Transmission Fluid Capacity:

Approx. 7-8 quarts (6.6-7.6 L) for 4T65-E/4T60-E (dry fill may be higher).

📐 Dimensions

Length:

Approx. 200.0 inches (5080 mm)

Width:

Approx. 72.5 inches (1841 mm)

Height:

Approx. 57.7 inches (1466 mm)

Wheelbase:

Approx. 110.5 inches (2807 mm)

Curb Weight:

Approx. 3,500 - 3,700 lbs (1588 - 1678 kg), depending on engine and options.

Trunk Volume:

Approx. 17.0 cubic feet (481 L)

🛡️ Safety Features

NHTSA Front Impact Driver:

5 Stars (for 2004 model year)

NHTSA Front Impact Passenger:

5 Stars (for 2004 model year)

IIHS Front Offset Crash Rating:

Good (for 2004 model year)

ABS:

Standard Anti-lock Braking System (ABS) on front wheels, often optional or standard on rear.

Traction Control:

Optional Traction Control System (TCS)

Airbags Front:

Standard Dual Frontal Airbags

Airbags Side:

Optional Side Impact Airbags

Seat Belts:

Front: Three-point seat belts with pretensioners. Rear: Three-point seat belts. Child seat LATCH anchors.

💡 Technology Features

Audio System:

Factory AM/FM/CD player, optional premium audio systems with subwoofer. Cassette player optional on some trims.

Cruise Control:

Standard on most trims, electronically controlled.

Onstar:

Optional OnStar system available for emergency services and vehicle diagnostics.

Instrument Cluster:

Analog gauges for speedometer, tachometer, fuel level, engine temperature. Message center for vehicle status and warnings.

🔧 Maintenance

Oil Change Interval:

Every 7,500 miles (12,000 km) or 6 months, whichever comes first, under normal driving conditions. Severe conditions may require more frequent changes.

Tire Rotation Interval:

Every 7,500 miles (12,000 km)

Transmission Fluid Service:

Inspect every 30,000 miles (48,000 km). Replace as needed or approximately every 100,000 miles (160,000 km) for normal service.

Brake Fluid Type:

DOT 3 (GM P/N 12378391 or equivalent)

Power Steering Fluid Type:

GM Power Steering Fluid (GM P/N 89021184 or equivalent)

Common Problems 3.8L:

Intake manifold gasket leaks (LIM), fuel pump issues, some transmission solenoid issues (e.g., 1-2 shift solenoid).

Common Problems 3.4L:

Head gasket failures, intake manifold gasket leaks, oil pan gasket leaks, water pump leaks.

Common Issues All:

Power window regulators failing, blower motor resistor failures, ABS sensor failures, early dashboard cracks.

📚 Vehicle History

Chevrolet History:

Chevrolet, founded in 1911, is one of America's most iconic automotive brands, known for producing a wide range of vehicles from affordable sedans to trucks and performance cars.

Impala Evolution:

The Impala nameplate has a long and storied history, dating back to the 1950s as a flagship model. The 2004 model represents the ninth generation of the Impala, a front-wheel-drive sedan based on GM's W-body platform, which had been in production since the 1990s.

Production Location 2004:

Oshawa Car Assembly, Ontario, Canada

🏆 Awards & Recognition

Safety Awards:

Recipient of various safety accolades from NHTSA and IIHS for its structural integrity and safety features in its class.

Consumer Reports Rating:

Varies by model year and specific components; generally considered a decent value offering for its price point, though some powertrain reliability concerns were noted for certain engine variants.