🏷️ Basic Information

Make:

Mercury

Model:

Grand Marquis

Year:

2008

Generation Designation:

Fourth Generation (2003-2011)

👋 Introduction

Segment:

Full-size luxury sedan, positioned as a comfortable and robust vehicle for highway cruising and executive transport.

Key Competitors:

Buick LaCrosse, Chrysler 300, Cadillac DTS.

Design Philosophy:

Rear-wheel drive platform, body-on-frame construction (shared with Ford Crown Victoria/Mercury Marauder), emphasis on ride comfort and durability.

Target Audience:

Buyers seeking a traditional American sedan with a focus on comfort, spaciousness, and proven mechanicals, often favored by fleet buyers and those prioritizing reliability.

📋 Manual Details

Covered Models:

All Mercury Grand Marquis models, trims, and engine configurations for the 2008 model year.

Covered Engines:

All engine variants for the 2008 Mercury Grand Marquis, primarily the 4.6L V8.

Covered Transmissions:

All transmission types offered for the 2008 Mercury Grand Marquis.

Estimated Page Count:

Detailed page count not provided, but described as 'complete' covering A-Z procedures.

Type:

Complete Workshop Service Repair Manual

Language:

English

Format:

Downloadable Digital Format (PDF compatible)

📖 Manual Coverage

Powertrain:

Engine mechanical, engine performance, fuel system, ignition system, exhaust system, cooling system, lubrication system, automatic transmission (4R75E/W), driveline.

Chassis:

Suspension (front and rear), steering system, braking system (including ABS), wheels and tires.

Electrical:

Battery, charging system, starting system, lighting, instrumentation, interior and exterior electrical components, body control module (BCM), powertrain control module (PCM) diagnostics.

Body:

Body construction, interior trim, exterior trim, doors, windows, glass, sunroof (if applicable), HVAC system, seating systems.

Routine Maintenance:

Oil and filter changes, air filter replacement, spark plug replacement, fluid level checks and top-offs, belt inspections and replacement.

Troubleshooting:

Diagnostic trouble codes (DTCs), symptom-based troubleshooting guides, electrical circuit diagnostics.

Repair And Overhaul:

Engine rebuild procedures, transmission overhaul, brake caliper and rotor replacement, suspension component replacement, electrical component replacement.

Specifications And Tolerances:

Torque specifications for critical fasteners, engine clearances, fluid capacities, diagnostic parameters.

Depth:

Comprehensive coverage from basic maintenance to advanced diagnostics and complete component rebuilds, suitable for professional technicians and advanced DIY enthusiasts.

📊 Manual Specifications

Compatibility:

Compatible with all PC & MAC computers, tablets, and mobile phones. Requires Adobe Reader.

Printability:

High quality, fully printable by page, chapter, or entire document.

Binding:

N/A (Digital Download)

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Engine Code:

4.6L SOHC V8 (Modular engine family)

Displacement:

4606 cc (281 cubic inches)

Bore X Stroke:

90.2 mm x 90.0 mm (3.55 in x 3.54 in)

Compression Ratio:

9.3:1

Horsepower:

224 hp @ 4800 rpm (standard) / 239 hp @ 4900 rpm (Police Interceptor and Performance Packages)

Torque:

270 lb-ft @ 3500 rpm (standard) / 275 lb-ft @ 3400 rpm (Police Interceptor and Performance Packages)

Fuel Delivery:

Electronic Fuel Injection (EFI) with Sequential Port Injection (SPI)

Fuel Type:

87 Octane Unleaded Gasoline (minimum)

Ignition System:

Coil-on-plug (COP) ignition system

🔧 Transmission

Transmission Type:

4-speed automatic

Transmission Model:

4R75E / 4R75W (W denotes electronic control)

Optional Transmission:

N/A (4-speed automatic was standard across all trims)

Gear Ratios:

Specific gear ratios can be found within the manual, typically around 2.82:1 (1st), 1.45:1 (2nd), 1.00:1 (3rd), 0.75:1 (4th), and 2.37:1 (Reverse).

Fluid Type:

MERCON V Automatic Transmission Fluid (ATF)

📐 Dimensions

Length:

5290 mm (208.3 inches)

Width:

1992 mm (78.4 inches)

Height:

1483 mm (58.4 inches)

Wheelbase:

3022 mm (119.0 inches)

Front Headroom:

Approximately 1020 mm (40.2 inches)

Rear Headroom:

Approximately 990 mm (39.0 inches)

Front Legroom:

Approximately 1070 mm (42.1 inches)

Rear Legroom:

Approximately 1060 mm (41.7 inches)

Trunk Volume:

Approximately 560 Liters (19.8 cubic feet)

Curb Weight:

Approximately 1820 kg (4012 lbs) depending on trim and options.

🛡️ Safety Features

NHTSA Frontal Driver:

Five-star rating (for 2008 models)

NHTSA Frontal Passenger:

Five-star rating (for 2008 models)

NHTSA Side Impact Driver:

Five-star rating (for 2008 models)

NHTSA Side Impact Passenger:

Five-star rating (for 2008 models)

NHTSA Rollover:

Four-star rating

ABS:

Standard Anti-lock Braking System (ABS) on all four wheels.

Traction Control:

Traction control system (TCS) available, often standard on higher trims or as part of optional packages.

Airbags:

Front driver and passenger airbags, available side curtain airbags.

Seatbelts:

Three-point seatbelts for all occupants, front seatbelt pretensioners.

💡 Technology Features

Audio System:

Standard AM/FM stereo with CD player. Optional premium audio systems with subwoofer, SiriusXM satellite radio. Auxiliary input jack may be present depending on trim.

Cruise Control:

Standard electronic cruise control.

Parking Assist:

Optional rear parking assist sensors.

Phone Integration:

Optional SYNC voice-activated communications and entertainment system (early version) offering Bluetooth connectivity and USB integration.

🔧 Maintenance

Oil And Filter:

Every 5,000 miles (8,000 km) or 6 months, whichever comes first, under normal driving conditions. Check manual for severe conditions.

Air Filter:

Inspect every 15,000 miles (24,000 km), replace as needed or every 30,000 miles (48,000 km).

Spark Plugs:

Recommended replacement every 100,000 miles (160,000 km) with original equipment type (e.g., Motorcraft Platinum).

Coolant:

Initial replacement at 100,000 miles (160,000 km) or 5 years, then every 50,000 miles (80,000 km) or 5 years thereafter.

Engine Oil:

SAE 5W-20 motor oil meeting Ford specification WSS-M2C153-H. Capacity approximately 6 quarts (5.7 Liters) with filter change.

Transmission Fluid:

MERCON V ATF. Capacity approximately 7.7 quarts (7.3 Liters) for a drain and fill.

Coolant:

Motorcraft Premium Engine Coolant (VC-5A) or equivalent meeting Ford specification WSS-M97B51-A1 (Orange coolant).

Brake Fluid:

DOT 3 Motor Vehicle Brake Fluid.

Common Problems:

Spark plug ejection (especially on earlier PI 4.6L engines, though less common by 2008), coolant intrusion into cylinders (intake manifold gaskets), rear main seal leaks, suspension component wear (ball joints, control arm bushings), power steering system leaks, carbon buildup on intake valves.

📚 Vehicle History

Brand Focus:

Mercury was positioned by Ford as a mid-tier brand, often offering more upscale styling and features than Ford models while being more accessible than Lincoln.

Platform Sharing:

The 2008 Grand Marquis is part of the Panther platform, a robust, rear-wheel-drive chassis shared with the Ford Crown Victoria, Mercury Marauder, and Lincoln Town Car. This platform has a long lineage dating back to the 1970s.

Manufacturing Location:

St. Thomas, Ontario, Canada.

Production End Date:

Mercury brand discontinued after the 2011 model year; Panther platform production ended in January 2012.

🏆 Awards & Recognition

Consumer Reports Reliability:

Reliability ratings vary, but the 4.6L V8 engine and Panther platform are generally considered robust and durable, often receiving average to above-average reliability scores in their class.