1998 Mercury Grand Marquis Service and Repair Manual

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Factory-Grade Data

The 1998 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 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

1998 Mercury Grand Marquis Recalls & Complaints

NHTSA #15E08200006/10/2015Component: STEERING

Dorman Products, Inc. (Dorman) is recalling certain model Dorman Steering Shafts, part number 425-359, Solutions Steering Shafts, part number 7-0359, and OE Solutions Steering Shafts, part number 425-

Consequence

If the shafts separate during vehicle operation, a loss of steering control would result, increasing

Remedy

Dorman will notify owners, and dealers will replace the steering shaft, free of charge. The recall

TSB #10026401

FORD/LINCOLN MERCURY: CERTAIN 1992-2001 MODEL YEAR CROWN VICTORIA, GRAND MARQUIS, AND TOWN CAR VEHICLES REGISTERED IN THE STATES OF WISCONSIN AND CONNECTICUT UPGRADE MODIFICATIONS FOR HIGH SPEED REAR IMPACTS. *PE

TSB #10023943

SOME 1997-2008 VEHICLES EQUIPPED WITH A 4.6L 2V, 5.4L 2V, OR 6.8L 2V ENGINE--SPARK PLUG THREAD REPAIR PROCEDURE--NOT COVERED UNDER NEW VEHICLE LIMITED WARRANTY. *NJ THIS INCLUDES F-53 MOTORHOME CHASSIS. UPDATED 2/23/10. *PE

TSB #10018959

EXTENDED COVERAGE PROGRAM 05N04 - EXTENDED COVERAGE FOR COMPOSITE INTAKE MANIFOLD. THIS PROGRAM IS BEING PROVIDED AS A SETTLEMENT TO A CLASS ACTION LAWSUIT. THE TERMS OF THE SETTLEMENT EXTEND THE COVERAGE OF THE ALL-COMPOSITE INTAKE MANIFOL

TSB #10018745

WDS COP KIT DIAGNOSTIC TIP - COIL ON PLUG (COP) IGNITION SYSTEMS - ENGINE MISFIRE OR ROUGH RUNNING. *TT

TSB #10014086

GENERAL (PCM) POWER TRAIN CONTROL MODULE PROGRAMMING PROCEDURES. *TT

TSB #10013369

GENERAL POWER TRAIN CONTROL MODULE (PCM) PROGRAMMING PROCEDURES. *TT

TSB #10013060

CLIMATE CONTROL A/C SERVICE TECH TIPS. *EH

TSB #10011162

ENGINE MISFIRE OR RUNNING - COIL ON PLUG (COP) IGNITION SYSTEMS - WDS COP KIT DIAGNOSTIC TIPS. TO INCLUDE VARIOUS 2005 MODELS. * AR THIS ARTICLE 04161 SUPERSEDES TSB 03-14-04.

Showing the 8 most recent of 164 technical service bulletins on file with NHTSA.

20061020Component: VEHICLE SPEED CONTROLCrash reported1 injured1 fatalities

DT*: THE CONTACT STATED THE CHECK ENGINE LIGHT WAS ILLUMINATED. THE VEHICLE WAS INSPECTED BY AN INDEPENDENT MECHANIC BUT WAS UNABLE TO IDENTIFY THE PROBLEM. THE PROBLEM WAS WITH THE VEHICLE SPEED CO

20010809Component: STEERING:HYDRAULIC POWER ASSIST:PUMPCrash reported1 injured

POWER STEERING RESERVOIR HOSE SEPARATED, CAUSING LOSS OF VEHICLE CONTROL WHICH RESULTED IN A COLLISION. DRIVER SUSTAINED MINOR INJURIES. DEALER HAS BEEN NOTIFIED.*AK

19980515Component: VEHICLE SPEED CONTROLCrash reported1 injured

VEHICLE ACCELERATED AFTER HAVING SHIFTED THE GEAR INTO PARK, CAUSES VEHICLE TO TAKE OFF WHILE CONSUMER'S FOOT WAS ON BRAKE PEDAL. VEHICLE CONTINUED TO LURCH FOUR TO FIVE BLOCKS, AND LANDED INTO SOMEO

20160428Component: STEERINGCrash reported

AUTOZONE- VALUCRAFT BRAND- BALL JOINTS PART NUMBER VFA2101 I RECENTLY HAD MY BALL JOINTS REPLACED AND I HAD A PREMATURE FAILURE OF THE BALL JOINT FASTENING HARDWARE WHILE DRIVING DOWN THE CITY ROAD

20160428Component: SUSPENSIONCrash reported

AUTOZONE- VALUCRAFT BRAND- BALL JOINTS PART NUMBER VFA2101 I RECENTLY HAD MY BALL JOINTS REPLACED AND I HAD A PREMATURE FAILURE OF THE BALL JOINT FASTENING HARDWARE WHILE DRIVING DOWN THE CITY ROAD

Showing the 5 most serious of 168 complaints filed with NHTSA.

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