🏷️ Basic Information

Make:

Pontiac

Model:

Grand Prix

Generation Name:

GTP (9th Generation)

Chassis Code:

W-Body

👋 Introduction

Positioning:

The Pontiac Grand Prix was positioned as a comfortable, stylish, and performance-oriented mid-size sedan, often appealing to buyers looking for a blend of daily drivability and sporty character. The later models, particularly those with the supercharged engines, were targeted at the enthusiast market.

Competitors:

Competed against vehicles such as the Chevrolet Impala, Ford Taurus, Dodge Intrepid, Toyota Camry, and Honda Accord. Its front-wheel-drive W-body platform provided a solid foundation shared with other GM sedans, allowing for economies of scale.

Features:

Available with naturally aspirated and supercharged V6 engines, comfortable interior, available performance packages (GTP trim), distinctive styling for its era, front-wheel drive.

📋 Manual Details

Covered Years:

2004, 2005, 2006, 2007, 2008

Estimated Page Count:

Over 2000 (Typical for comprehensive factory service manuals)

Type:

Factory Service Manual (FSM) / Workshop Repair Manual

Language:

English

Format:

PDF with index

📖 Manual Coverage

Engine Mechanical:

Engine overhaul, internal component repairs (pistons, rings, bearings, crankshaft, camshafts), cylinder head service, valve train, timing systems, engine mounts, cooling system, lubrication system.

Engine Electrical:

Ignition system, starting system, charging system (alternator, battery), fuel injection system diagnostics, ECU/PCM operation, sensors and actuators, wiring diagrams, lighting system, instrument cluster, body control module (BCM).

Emission Control:

Evaporative emission control (EVAP) system, exhaust gas recirculation (EGR), catalytic converter, oxygen sensors, onboard diagnostics (OBD-II) procedures, emission control component testing and repair.

Fuel System:

Fuel tank and pump, fuel lines, fuel filter replacement, fuel injectors, fuel pressure regulator, throttle body service, fuel system diagnostics and pressure testing.

Clutch System:

Clutch pedal assembly, clutch master and slave cylinders, hydraulic lines, clutch disc, pressure plate, release bearing (for manual transmission models).

Manual Transaxle:

Internal components, gear sets, synchronizers, shift forks, clutch release mechanism, transmission fluid service, removal and installation procedures.

Automatic Transaxle:

Internal components (torque converter, clutch packs, planetary gear sets), valve body, transmission control module (TCM) diagnostics, fluid service, filter replacement, removal and installation procedures.

Driveshaft And Axle:

CV joints, drive axles, half-shafts, driveshaft (RWD applications if applicable), removal and installation, lubrication, boot replacement.

Suspension System:

Front and rear suspension components (struts, shock absorbers, control arms, ball joints, bushings, sway bars), wheel alignment specifications, spring replacement, bearing service.

Steering System:

Power steering pump, steering rack, tie rod ends, steering column, power steering fluid service, steering angle sensor calibration.

Restraint System:

Airbag system components (SRS module, sensors, inflators, seatbelts), airbag system diagnostics, seatbelt service, occupant classification systems.

Brake System:

Front and rear brake pads and rotors, caliper service, brake lines and hoses, master cylinder, brake booster, ABS system diagnostics and components, parking brake service.

Body Interior:

Interior trim panel removal, seat removal and repair, dashboard disassembly, headliner service, door panel access, carpet replacement.

Body Exterior:

Door removal and installation, hood and trunk operation, bumper cover removal and installation, fender replacement, glass replacement, exterior trim, body panel alignment.

Body Electrical:

Lighting (headlights, taillights, interior lights), power windows, power locks, mirrors, remote keyless entry, wiper system, horn, trailer wiring (if applicable), body control module (BCM) functions.

HVAC:

Air conditioning system (compressor, condenser, evaporator, refrigerant), heating system (heater core, blower motor), climate control module diagnostics, cabin air filter replacement, ductwork.

Maintenance Procedures:

Oil change, filter replacement, fluid checks and changes (coolant, brake, power steering, transmission), tire rotation, spark plug replacement, air filter replacement, cabin air filter replacement, wiper blade replacement.

Diagnostic Procedures:

OBD-II code retrieval and interpretation, circuit testing, component testing using multimeters and scan tools, symptom-based troubleshooting guides.

Repair Procedures:

Step-by-step instructions for component removal, installation, and repair for all major systems. Includes torque specifications, special tool requirements, and critical alignment procedures.

Rebuild Procedures:

Detailed guides for rebuilding engines, transmissions, and major suspension components, including part specifications and assembly sequences.

Technical Specifications:

Torque specifications, fluid capacities and types, diagnostic trouble codes (DTCs), wiring diagrams, component locations, electrical schematics, engine specifications.

Depth:

Comprehensive: Covers everything from basic maintenance and fluid changes to complex engine and transmission rebuilds, advanced electrical diagnostics, and bodywork repairs. Suitable for professional technicians and advanced DIY enthusiasts.

📊 Manual Specifications

Format:

PDF

Quality:

High-resolution scans, clear text, and legible diagrams ensuring ease of use and accurate information reproduction.

Binding:

Digital (PDF) - No physical binding. Accessible on computers, tablets, and smartphones.

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Engine Options:

3.8L V6 (Naturally Aspirated & Supercharged). Naturally aspirated: L36 (3800 Series II). Supercharged: L67 (3800 Series II Supercharged). Other smaller engines may have been available in specific markets or base trims, but the 3.8L V6 was the mainstay.

3.8L V6 Na (L36):

Approx. 200-205 hp, 225-230 lb-ft torque.

3.8L V6 Supercharged (L67):

Approx. 240-260 hp, 280-315 lb-ft torque (depending on year and specific tune).

Injection Type:

Sequential Fuel Injection (SFI)

🔧 Transmission

Type:

4-speed automatic transaxle (e.g., 4T65-E) was standard on most models.

Type:

Some early W-body platforms offered manual transmissions, but for the 2004-2008 Grand Prix, automatic was overwhelmingly dominant. A performance-oriented automatic with manual shifting capability (e.g., Tap-Up/Tap-Down) was common on GTP models.

Features:

Electronic control, adaptive shift logic, some models featured traction control integration.

📐 Dimensions

Wheelbase:

Approximately 110.5 inches

Length:

Approximately 199.7 inches

Width:

Approximately 71.4 inches

Height:

Approximately 56.7 inches

Trunk Capacity:

Approximately 15.0 - 16.0 cubic feet

Curb Weight:

Approximately 3400 - 3700 lbs (depending on engine and trim)

🛡️ Safety Features

NHTSA Frontal Impact:

Likely 4 or 5 stars (typical for vehicles of this era with standard safety equipment).

NHTSA Side Impact:

Likely 4 or 5 stars (depending on specific configuration and year).

ABS:

Standard Anti-lock Braking System (ABS).

Traction Control:

Available Traction Control System (TCS), often integrated with stability control in later years.

Airbags:

Frontal airbags for driver and passenger. Side-impact airbags may have been optional or standard on higher trims.

Seatbelts:

Three-point seatbelts with pretensioners for front occupants.

💡 Technology Features

Audio System:

Factory-installed AM/FM stereo with CD player, optional premium sound systems (e.g., Monsoon), and potentially satellite radio readiness. Cassette players were phased out but might be present in early models.

Cruise Control:

Standard cruise control.

Park Assist:

Rear parking assist sensors may have been an option on higher trims.

Phone Integration:

Limited by modern standards. Early Bluetooth might have been available on top-tier trims as an option or dealer-installed accessory.

🔧 Maintenance

Oil Change Interval:

Typically 5,000 to 7,500 miles or 6 months, whichever comes first, with synthetic oil recommended for optimal performance and longevity. Consult manual for specific oil type.

Transmission Fluid Change:

Recommended every 30,000 to 60,000 miles, especially under severe driving conditions. Use only the specified DEXRON fluid type.

Coolant Flush:

Typically every 30,000 to 50,000 miles or 2-3 years. Use of GM's specified Dex-Cool coolant is critical.

Engine Oil:

Typically SAE 3.8L V6: 5W-30 (API Certified, GM spec GM6094M). Consult manual for precise specification and capacity.

Transmission Fluid:

Dexron VI or equivalent for 4T65-E transmissions.

Power Steering Fluid:

GM Power Steering Fluid (Type A Suffix A is often specified for this era, but always verify).

Brake Fluid:

DOT 3 or DOT 4 brake fluid.

Engine Mounts:

The 3800 V6 engines, especially the supercharged variants, are known for aging and failing engine mounts, leading to vibrations and clunking noises.

Transaxle Issues:

The 4T65-E transmission can experience issues related to torque converter clutch shudder, solenoid failures, or internal wear if not properly maintained. Leaks from axle seals are also common.

Suspension Components:

Front strut mounts, ball joints, and tie rod ends can wear out over time, affecting handling and alignment.

Electrical Gremlins:

Body control module (BCM) related issues, power window regulators, and intermittent sensor failures are not uncommon in vehicles of this age.

Supercharger Belt:

The supercharger drive belt on L67 engines needs periodic inspection and replacement to prevent failure.

📚 Vehicle History

Pontiac Legacy:

Pontiac was known for its performance-oriented vehicles and distinctive styling. The Grand Prix nameplate has a long history within Pontiac, evolving from a personal luxury coupe to a more mainstream sedan.

9Th Gen Evolution:

The 2004-2008 models represent the final iteration of the 9th generation Grand Prix. This generation saw a focus on refining the existing W-body platform, with updates to styling, interior amenities, and powertrain options, particularly the continued offering of the potent supercharged V6.

Assembly Location:

Lake Orion, Michigan, USA (GM Assembly Plant)

Production End:

Production of the Pontiac brand ceased in 2010, with the Grand Prix being discontinued after the 2008 model year, making this manual highly relevant for owners of these later models.

🏆 Awards & Recognition

Ward Best Engines:

The GM 3800 Series II V6 (both naturally aspirated L36 and supercharged L67) was a Ward's 10 Best Engines winner multiple times, recognized for its smoothness, durability, and power delivery, especially the supercharged variant.

Safety Awards:

Specific safety awards would vary by year and testing organization, but generally, vehicles of this era aimed for good frontal and side impact scores.