1988 Mercury Grand Marquis Service and Repair Manual
The 1988 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
- Base Sedan 2-Door
- Base Sedan 4-Door
- GS Sedan 4-Door
- LS Sedan 4-Door
Engines covered
- 5.0L 302Cu. In. V8 GAS OHV Naturally Aspirated
- 5.8L 5753CC 351Cu. In. V8 GAS OHV 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
AUTOMATIC RETRACTOR FOR SEAT BELTS FOR DUAL FACING REAR SEATS MAY BE INSTALLED IN AN IMPROPER LOCATION.
SEAT BELT COULD BIND BETWEEN SEAT CUSHION AND SEAT BACKCAUSING THE RETRACTOR TO BE SLUGGISH OR UNABL
REMOVE AND PROPERLY INSTALL THE RIGHT AUXILIARY SEAT BELTS.
TRANSFER SERVICE TIPS FOR THE FRONT WIPER MOTOR MOUNT BRACKET AND DEPRESSED PARK OUTPUT ARM. *TT
SOME VEHICLES MAY EXHIBIT HEATER CORE LEAKS. *SLC
INFORMATION REGARDING TRANSMISSION FLUID USAGE CHARTS. *SLC
SUBJECT REGARDING CONTAMINATION FROM PRIOR TRANSMISSION CONCERNS OR EXCESS WEAR MAY BE TRAPPED IN THE TRANSMISSION FLUID COOLING SYSTEM. *TT
INFORMATION ON THE NEW FLUSH AND FILL TOOL AVAILABLE THROUGH ROTUNDA. *TT
INFORMATION REGARDING THE NEW TRANSMISSION COOLER FLUSHER- SERVICE TIP. *MJS
INFORMATION ON IDENTIFYING NON-APPROVED / ALTERNATE REFRIGERANTS WHICH COULD CAUSE SAFETY, AND PERFORMANCE CONCERNS IF INSTALLED IN FORD A/C SYSTEMS. *TT
SUBJECT ON A WIRE HARNESS TERMINAL REPAIR KIT AVAILABLE FOR REPAIRING ELECTRICAL WIRING HARNESSES. *TT
Showing the 8 most recent of 27 technical service bulletins on file with NHTSA.
WHILE DRIVING ON INTERSTATE 94 IN CHICAGO, I ACCELERATED TO PASS A CAR. THE ACCELERATION DEVICE WITHIN THE ENGINE, NOT ONLY STUCK, BUT IT INCREASED SPEED. I TRIED TO BRAKE THE CAR WITH LITTLE RESPON
SUDDEN ACCELERATION, CAUSING ACCIDENT AND INJURIES. *TW
VEHICLE SUDDENLY ACCELERATED TWICE, ONCE RESULTING IN AN ACCIDENT. *SKD
VEHICLE WAS AT A STOP LIGHT, APPLIED ACCELEATOR PEDAL, VEHICLE OPEN THROTTLE POSITION, ACCELETOR PEDAL STUCK, IMPACT 12:00 SPEED UNKNOWN. *AK
Showing the 4 most serious of 98 complaints filed with NHTSA.
