2008 Mercury Grand Marquis Service and Repair Manual

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Factory-Grade Data

The 2008 Mercury Grand Marquis Service and Repair Manual is a practical, workshop-ready reference for maintenance, diagnostics, and repairs. Use it to troubleshoot symptoms, follow step-by-step procedures, verify specifications, and confirm wiring and connector locations before replacing parts.

Ideal for technicians and DIY owners, it supports everything from routine service to deeper mechanical and electrical work—including drivability, no-start, warning lights, overheating, brake and suspension issues, HVAC faults, and circuit testing.

Trims covered

  • GS Sedan 4-Door
  • LS Sedan 4-Door

Engines covered

  • 4.6L 281Cu. In. V8 FLEX SOHC Naturally Aspirated
  • 4.6L 281Cu. In. V8 GAS SOHC Naturally Aspirated

What’s inside

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

Why this manual matters

  • Faster diagnostics with system-based troubleshooting and wiring diagrams
  • Clear procedures and reference sections to reduce guesswork and rework
  • Helpful for maintenance planning and verifying parts/specs before repairs

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Vehicle Safety Data

2008 Mercury Grand Marquis Recalls & Complaints

NHTSA #13V38500029/08/2013Component: STEERING

Ford is recalling certain model year 2005-2011 Ford Crown Victoria (including Crown Victoria Police Interceptors), Mercury Grand Marquis, and Lincoln Town Car vehicles. The affected vehicles are curre

Consequence

If the lower bearing separates, the vehicle may experience a loss of steering, increasing the risk o

Remedy

Ford will notify owners and dealers will replace the lower intermediate shaft, free of charge. The

TSB #10204997

4R75E Transmission - Grinding/Whine/Vibration/Gear Slippage - Serrvice Kit available

TSB #10205037

Inpected or repaired under 13R01 - Requests for recall service action under 13S08

TSB #10183773

For 2005-2012 Crown Victoria, 2005-2011 Grand Marquis and Town Car vehicles, Regional Program 13R01 applies to vehicles not registered in corrosion states and not included in Safety Recall 13S08, where operation in high corrosion areas for

TSB #10166447

This SKU is a Radiator Fan. The customer communication requested return of unsold inventory to inspect the electrical connections. An electrical connection issue may lead to the fan not working potentially throwing a check engine light for

TSB #10137113

Replacing the original equipment SYNC/Navigation system with either an aftermarket SYNC/Navigation kit or modifying original SYNC/Navigation parts to provide additional features is not recommended nor supported on any Ford, Mercury or Linco

TSB #10109070

The Powertrain Control/Emissions Diagnosis (PC/ED) manual has been revised for diagnosing electronic throttle bodies (ETBs). The ETC_ACT and ETC_DSD PIDs should not used to diagnose possible ETB concerns. The IDS has a limited refresh rate

TSB #10095184

REPLACING THE ORIGINAL EQUIPMENT SYNC/NAVIGATION SYSTEM WITH EITHER AN AFTERMARKET SYNC/NAVIGATION KIT OR MODIFYING ORIGINAL SYNC/NAVIGATION PARTS TO PROVIDE ADDITIONAL FEATURES IS NOT RECOMMENDED NOR SUPPORTED ON ANY FORD, MERCURY OR LINCO

TSB #10075262

4R75E TRANSMISSION - GRINDING/WHINE/VIBRATION/GEAR SLIPPAGE - SERVICE KIT AVAILABLE ISSUE A service kit has been released to assist with proper repair of the 4R75E transmission in 2008 Mark LT, 2008-2010 F-150, 2008-2010 / 2013-2014 E-Serie

Showing the 8 most recent of 16 technical service bulletins on file with NHTSA.

20100707Component: VEHICLE SPEED CONTROLCrash reportedFire reported1 injured

TL*THE CONTACT OWNS A 2008 MERCURY GRAND MARQUIS. AFTER DRIVING IN REVERSE AND SHIFTING INTO DRIVE FROM A STOP LIGHT THE VEHICLE SURGED FORWARD AND CRASHED INTO ANOTHER VEHICLE. A POLICE REPORT WAS NO

20100727Component: VEHICLE SPEED CONTROLCrash reported2 injured

TL* THE CONTACT OWNS A 2008 MERCURY GRAND MARQUIS. THE CONTACT STATED HE STARTED THE VEHICLE AND WHEN DEPRESSING THE BRAKES, THE VEHICLE ABNORMALLY ACCELERATED. THE CONTACT WAS UNABLE TO STOP THE UNI

20180731Component: AIR BAGSCrash reported1 injured

I HAVE A 2008 MECURY GRAND MARQUIS ,I WAS IN A WRECK IN DECEMBER 10,2017 FRONTAL IMPACT MY AIR BAGS DID NOT GO OFF OR WORK DURING MY WRECK ALSO MY SEAT BELTS DID NOT WORK AS WELL. I GOT HURT IN THE WR

20180731Component: SEAT BELTSCrash reported1 injured

I HAVE A 2008 MECURY GRAND MARQUIS ,I WAS IN A WRECK IN DECEMBER 10,2017 FRONTAL IMPACT MY AIR BAGS DID NOT GO OFF OR WORK DURING MY WRECK ALSO MY SEAT BELTS DID NOT WORK AS WELL. I GOT HURT IN THE WR

20180731Component: UNKNOWN OR OTHERCrash reported1 injured

I HAVE A 2008 MECURY GRAND MARQUIS ,I WAS IN A WRECK IN DECEMBER 10,2017 FRONTAL IMPACT MY AIR BAGS DID NOT GO OFF OR WORK DURING MY WRECK ALSO MY SEAT BELTS DID NOT WORK AS WELL. I GOT HURT IN THE WR

Showing the 5 most serious of 101 complaints filed with NHTSA.

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