🏷️ Basic Information

Make:

Chevrolet

Model:

Impala

Year:

2003

Full Product Name:

Chevrolet Chevy Impala Complete Workshop Service Repair Manual 2003

👋 Introduction

Segment:

Full-size sedan

Target Audience:

Individuals seeking to perform their own maintenance and repairs, DIY enthusiasts, and professional mechanics.

Competitors 2003:

Ford Crown Victoria, Mercury Grand Marquis, Toyota Avalon, Buick LeSabre.

Value Proposition:

Comprehensive repair and maintenance information for the 2003 Impala, enabling cost savings and extended vehicle life.

Manual Advantage:

Provides detailed OEM-level procedures and specifications not always found in generic repair guides.

📋 Manual Details

Manual Type:

Workshop Service Repair Manual

Language:

English

Format:

Downloadable

Estimated Page Count:

1000+

📖 Manual Coverage

Engine Management:

Complete diagnostics, testing, and repair procedures for all engine control systems.

Fuel System:

Fuel injection system diagnosis, pump, injectors, pressure regulator, and fuel tank service.

Cooling System:

Radiator, water pump, thermostat, hoses, and cooling fan diagnosis and replacement.

Exhaust System:

Catalytic converter, mufflers, exhaust manifolds, and O2 sensors.

Transmission:

Automatic transmission (4T65-E) service, overhaul, diagnosis, and fluid changes.

Drivetrain:

Front-wheel drive axle shafts, CV joints, and differential service.

Suspension:

Front and rear suspension components, struts, shocks, control arms, ball joints, and alignment procedures.

Steering:

Power steering system diagnosis, pump, rack and pinion, and tie rod ends.

Brakes:

Front and rear disc brake systems, ABS diagnostics, hydraulic lines, master cylinder, and caliper service.

Electrical System:

12V battery, charging system, starting system, and all major electrical components.

Lighting System:

Headlights, taillights, interior lighting, and related wiring.

HVAC:

Heating, ventilation, and air conditioning system diagnosis and repair, including refrigerant handling.

Body And Frame:

Body panel repair, door mechanisms, glass replacement, and structural information.

Interior:

Seat removal, dashboard disassembly, trim panels, and upholstery.

Chassis Electrical:

Wiring diagrams, fuses, relays, and control modules.

Driver Information Center:

Diagnosis and repair of the vehicle's onboard computer and display systems.

Scheduled Maintenance:

Detailed maintenance schedules for oil changes, filter replacements, fluid checks, and inspections.

Engine Repair:

Engine tune-ups, cylinder head removal and installation, piston and ring replacement, and crankshaft service.

Transmission Repair:

Complete transmission overhaul, clutch pack replacement, and solenoid diagnosis.

Brake Service:

Brake pad and rotor replacement, caliper rebuild, and brake fluid bleeding.

Suspension Repair:

Strut and shock absorber replacement, control arm bushing replacement, and wheel bearing service.

Electrical Diagnostics:

Troubleshooting common electrical faults, component testing, and wiring harness repair.

HVAC Repair:

Refrigerant recharging, leak detection, compressor replacement, and evaporator core service.

Body Repair:

Dent repair, panel replacement, door hinge adjustment, and window regulator replacement.

Troubleshooting Guides:

Comprehensive symptom-based troubleshooting for all major vehicle systems.

Diagnostic Procedures:

Step-by-step diagnostic routines using scan tools and multimeters.

Specifications And Tolerances:

Detailed torque specifications, measurements, and operating clearances for all components.

Wiring Diagrams:

Complete, system-specific wiring diagrams for all electrical circuits.

Depth Level:

Comprehensive (from basic maintenance to full engine and transmission rebuilds).

📊 Manual Specifications

File Type:

Digital Download (typically PDF)

Searchability:

Likely text-searchable for quick information retrieval.

Printability:

Printable pages for workshop use.

Image Resolution:

High-resolution images and diagrams for clarity.

Binding:

N/A (Digital Format)

Paper Quality:

N/A (Digital Format)

⚙️ Engine Specifications

Engine Code Variant 1:

3.8L (3800 Series III) V6 OHV

Engine Code Variant 2:

3.4L (3400) V6 OHV

3.8L Horsepower:

200 hp @ 5200 rpm

3.8L Torque:

225 lb-ft @ 4000 rpm

3.4L Horsepower:

180 hp @ 4800 rpm

3.4L Torque:

205 lb-ft @ 3200 rpm

Fuel Delivery:

Sequential Central Port Fuel Injection (SCPI) for 3.8L, Multi-port Fuel Injection (MPI) for 3.4L.

Recommended Fuel:

87 Octane Unleaded Gasoline

ECU Type:

GM Powertrain Control Module (PCM)

🔧 Transmission

Transmission Type:

4-Speed Automatic (4T65-E)

Optional Transmission:

N/A (Only Automatic for 2003 Model Year)

Transmission Fluid Type:

Dexron-III Automatic Transmission Fluid (ATF)

Transmission Fluid Capacity:

Approximately 10.9 quarts (10.3 liters) for a dry fill (refer to manual for exact capacity).

📐 Dimensions

Length:

199.7 inches

Width:

71.4 inches

Height:

57.7 inches

Wheelbase:

110.5 inches

Passenger Volume:

104.9 cubic feet

Trunk Volume:

16.9 cubic feet

Curb Weight 3.8L:

Approximately 3530 lbs

Curb Weight 3.4L:

Approximately 3450 lbs

🛡️ Safety Features

NHTSA Driver Front Impact:

5 Stars

NHTSA Passenger Front Impact:

5 Stars

IIHS Moderate Overlap Frontal Offset:

Good

ABS:

Standard Anti-lock Braking System (ABS)

Traction Control:

Available Traction Control System (TCS)

Airbags:

Driver and front passenger airbags, optional side-impact airbags.

Seatbelts:

Three-point seatbelts for all occupants, driver and front passenger pretensioners.

💡 Technology Features

Audio System:

AM/FM stereo with CD player, available premium sound system, steering wheel audio controls.

Display:

Digital odometer, driver information center with trip computer.

Cruise Control:

Standard cruise control.

Onstar:

Optional OnStar safety and communication system integration.

🔧 Maintenance

Oil Change Interval:

Every 7,500 miles or 6 months, whichever comes first (synthetic oil recommended).

Transmission Fluid Change:

Every 100,000 miles or 10 years (under normal driving conditions). Severe conditions may require more frequent changes.

Coolant Change:

Every 150,000 miles or 5 years (long-life coolant).

Spark Plug Replacement:

Platinum-tipped spark plugs rated for 100,000 miles.

Engine Oil Type:

SAE 5W-30 (Synthetic recommended)

Engine Oil Capacity:

4.5 quarts (4.3 liters) for 3.4L, 4.5 quarts (4.3 liters) for 3.8L (refer to manual for exact capacity).

Coolant Type:

GM P/N 12346290 (Orange Long-Life Coolant) or equivalent.

Brake Fluid Type:

DOT 3

Common Problem 1:

Intake manifold gasket leaks (especially on 3800 Series II, less common on III but still possible).

Common Problem 2:

EGR (Exhaust Gas Recirculation) valve clogging, leading to rough idling or stalling.

Common Problem 3:

Alternator failures, particularly the internal voltage regulator.

Common Problem 4:

Power steering pump leaks or noise.

Common Problem 5:

Transmission issues, though the 4T65-E is generally robust, internal wear or solenoid issues can occur.

📚 Vehicle History

Chevrolet Legacy:

Chevrolet, founded by Louis Chevrolet and Billy Durant, has a long history of producing reliable and accessible vehicles for American consumers.

Impala Lineage:

The Impala has been a flagship model for Chevrolet, evolving from a sporty coupe in the late 1950s to a full-size sedan in recent decades. The 2003 model represents the eighth generation (1999-2005) of the modern Impala, built on the W-body platform.

Assembly Locations:

Oshawa, Ontario, Canada.

Production Years For 8Th Gen:

1999-2005

🏆 Awards & Recognition

Major Awards:

While specific awards for the 2003 model year are not prominently documented, the Impala has historically been a popular and well-regarded model in its segment.

Consumer Reports Rank:

Varies by specific year and trim, generally considered an average performer in reliability and satisfaction.

Epa Fuel Economy:

3.4L: Approx. 19 MPG city / 28 MPG highway. 3.8L: Approx. 18 MPG city / 27 MPG highway (EPA estimates, actual mileage may vary).