Problems owners report
Complaints filed with NHTSA about the 1986 Mercury Grand Marquis, by the system named in each complaint. One complaint can name several.
- Electrical system11
- Engine and engine cooling4
- Service brakes, hydraulic2
- Power train1
- Steering1
- Vehicle speed control1
- Tires1
- Structure1
NHTSA ODI complaints (public domain) · updated 23 Oct 2026 · 0 injuries and 0 deaths reported
Compared with other years
NHTSA ODI complaints by model year
New York safety inspections
At its first New York inspection the 1986 Mercury Grand Marquis failed the safety check 2.67% of the time — 249% more often than the average 1986 passenger car (0.76%). Median odometer at inspection: 76,809 miles.
NY DMV Vehicle Inspections (vezn-fmmk), initial inspections since Aug 2021 · how we count
Recalls in Canada
1 Transport Canada recall for the 1986 Mercury Grand Marquis.
| 1987098 9 Sept 1987 | Fuel System ON VEHICLES WITH EFI OR CFI, THE SPRING-LOCK FUEL LINE COUPLING USED TO CONNECT THE FUEL SUPPLY AND RETURN LINES TO THE EFI FUEL RAILS OR TO THE CFI THROTTLE BO… |
Transport Canada Vehicle Recalls Database · Contains information licensed under the Open Government Licence – Canada
Recalls
SPRING LOCK FUEL LINE COUPLING MAY NOT BE PROPERLY ENGAGED.
Whether a recall was fixed on a particular car is known only to the manufacturer: check the VIN at nhtsa.gov/recalls.
NHTSA recalls · summaries in NHTSA's own words
Service bulletins
What Mercury told its dealers about the 1986 Mercury Grand Marquis: known faults, fixes and updates.
| Bulletin | Summary |
|---|---|
| 623988 | INFORMATION REGARDING TRANSMISSION FLUID USAGE CHARTS. *SLC |
| 623944 | SOME VEHICLES MAY EXHIBIT HEATER CORE LEAKS. *SLC |
| 616522 | SUBJECT REGARDING CONTAMINATION FROM PRIOR TRANSMISSION CONCERNS OR EXCESS WEAR MAY BE TRAPPED IN THE TRANSMISSION FLUID COOLING SYSTEM. *TT |
| 612203 | INFORMATION REGARDING THE NEW TRANSMISSION COOLER FLUSHER- SERVICE TIP. *MJS |
| 6090087 | INFORMATION ON IDENTIFYING NON-APPROVED / ALTERNATE REFRIGERANTS WHICH COULD CAUSE SAFETY, AND PERFORMANCE CONCERNS IF INSTALLED IN FORD A/C SYSTEMS. *TT |
| 6089681 | SUBJECT ON A WIRE HARNESS TERMINAL REPAIR KIT AVAILABLE FOR REPAIRING ELECTRICAL WIRING HARNESSES. *TT |
| 608431 | INFORMATION ON THE NEW FLUSH AND FILL TOOL AVAILABLE THROUGH ROTUNDA. *TT |
| 604059 | FORD MOTOR COMPANY HAS RELEASED A NEW ELECTRICAL GREASE ( F8AZ - 19G208-AA ) TO REDUCE THE POSSIBILITY OF MOISTURE CORROSION AT THE TERMINALS. *YC |
| 601343 | A NEW SILICONE GASKET AND SEALANT. *YC |
| 601312 | INFORMATION ON A BUZZING OR RATTLE NOISE FROM THE EXHAUST SYSTEM. *TT |
| 601290 | INFORMATION ON TIRE COMPANY TELEPHONE NUMBERS FOR CUSTOMER ASSISTANCE. *YC |
| 601269 | ANNOUNCING THE FORD OEM AIR CONDITIONING RETROFIT KIT AVAILABILITY. *YC |
| 601238 | INFORMATION ON A NEW TRANSMISSION FLUID USAGE CHART. *YC |
| 601012 | THE USE OF PETROLEUM-BASED GREASE AS A LUBRICANT IN SERVICING DISC BRAKES IS NO LONGER ACCEPTABLE. *YC |
| 51945 | FLUID- TRANSMISSION FLUID USAGE CHARTS. *JD |
| 50997 | TRANSAXLE - TORQUE CONVERTER REPLACEMENT GUIDELINES AND TORQUE CONVERTER/TRANSAXLE COOLING SYSTEM CLEANING PROCEDURES - SERVICE TIP. *TW |
| 50940 | WINDSHIELD AND INTERIOR GLASS - FOG/FILM. *TW |
| 50908 | TORQUE CONVERTER - LEAK TEST PROCEDURE - SERVICE TIP. *TW |
| 50905 | WIRING - ELECTRICAL DIODE IDENTIFICATION AND SERVICE REPLACEMENTS. *TW |
| 46478 | THE USE OF PETROLEUM-BASED GREASE AS A LUBRICANT IN SERVICING DISC BRAKES IS NO LONGER ACCEPTABLE BECAUSE IT MAY BE INCOMPATIBLE WITH THE RUBBER MATERIAL USED IN THE DISC BRAKE SYSTEM. IF PETROLEUM-BASED GREASE IS USED TO LUBRICATE ANY PART OF THE DISC BRAKE SYSTEM, IT COULD CAUSE RUBBER PARTS TO SWELL IF LUBRICANT CONTACTS THE RUBBER MATERIAL. |
| 39900 | ROUGHNESS CONCERN DURING BRAKE APPLICATION. *TW |
| 3030413 | UNKNOWN |
NHTSA manufacturer communications (public domain)
NHTSA investigations
BRAKE LINE PUNCTURES
FIRES
NHTSA Office of Defects Investigation