1986 Mercury Grand Marquis Service and Repair Manual
The 1986 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
- Colony Park Wagon 4-Door
- LS Sedan 2-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
SPRING LOCK FUEL LINE COUPLING MAY NOT BE PROPERLY ENGAGED.
COUPLING COULD DISENGAGE DUE TO FUEL PRESSURE,VIBRATION, AND ENGINE MOVEMENTS; THIS WOULD CAUSE LOSS
INSTALL RETAINER CLIPS OVER THE COUPLINGS TO PREVENT COUPLING SEPARATION AND FUEL LEAKAGE.
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
FORD MOTOR COMPANY HAS RELEASED A NEW ELECTRICAL GREASE ( F8AZ - 19G208-AA ) TO REDUCE THE POSSIBILITY OF MOISTURE CORROSION AT THE TERMINALS. *YC
Showing the 8 most recent of 22 technical service bulletins on file with NHTSA.
OHIO POLICE REPORT. WHILE DRIVING VEHICLE STARTED TO LOSE PRESSURE,THEN BEGAN TO SMOKE. DRIVER PULLED OVER AND VEHICLE ENGULFED INTO FLAMES. CONSUMER STATED THAT MUFFLER HAD BEEN REPLACED AND A NEW
VEHICLE VIBRATES ON RIGHT FRONT END WHEN BRAKES ARE APPLIED. WHEN BRAKES ARE LET GO, FEELS LIKE THEY ARE GRABBING. HAD STOPPED VEHICLE TO CHECK & NOTICED SMOKE FROM TIRES & THEN FLAMES SHOT OUT. HAD V
VEHICLE VIBRATES ON RIGHT FRONT END WHEN BRAKES ARE APPLIED. WHEN BRAKES ARE LET GO, FEELS LIKE THEY ARE GRABBING. HAD STOPPED VEHICLE TO CHECK & NOTICED SMOKE FROM TIRES & THEN FLAMES SHOT OUT. HAD V
WHILE PARKED, AN ELECTRICAL SHORT IN THE IGNITION SWITCH, CAUSED THE WIRING IN DASH AREA TO SHORT OUT, RESULTING IN A VEHICLE FIRE. *AK
THE IGNITION SWTICH HAS CAUGHT ON FIRE TWICE, FIRST TIME IN AUGUST OF 1991, SECOND TIME ON OCT, 4TH. *AK
Showing the 5 most serious of 22 complaints filed with NHTSA.
