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