Total Complaints
24 filings
MERCURY GRAND MARQUIS · model year
1984 MERCURY GRAND MARQUIS
24 NHTSA complaints, 2 crash reports for this specific cohort.
NHTSA overall rating
Not crash-tested
New Car Assessment Program
The 1984MERCURYGRAND MARQUIS carries 24 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 2 crashes, 6 fires, 1 injury, and 2 fatalities. No NCAP 5-star crash-test rating is available for this model year in the federal database.
Component-level analysis is where model-year complaints become actionable: the top complaint category for the 1984 GRAND MARQUIS is structure:body with 3 filings, followed by electrical system:ignition:switch (3) and electrical system:wiring:front underhood (3). Concentration in one or two component groups is the classic signature of a systemic defect; a flat distribution usually reflects normal aging, warranty complaints, or isolated build-plant variability.
NHTSA currently has 3 investigation files overlapping the 1984 GRAND MARQUIS. Owners comparing this cohort against neighboring years should pair the counters above with the complaint-by-year trend on the parent model page — a spike in a single year often tracks to a platform refresh, a new transmission supplier, or an updated ECU calibration. Use the related-complaint feed below to read raw owner narratives before deciding whether any pattern here affects your specific use case.
24
Complaints
2
Crashes
6
Fires
1
Injuries
2
Deaths
Crashes Reported
2 reports
Source
NHTSA ODI
Federal complaints database
Complaints vs. fleet median (215)
At or below the fleet median complaint volume.
Complaints by Component
| Component | Count |
|---|---|
| STRUCTURE:BODY | 3 |
| ELECTRICAL SYSTEM:IGNITION:SWITCH | 3 |
| ELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD | 3 |
| VEHICLE SPEED CONTROL | 3 |
| ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE) | 2 |
| UNKNOWN OR OTHER | 2 |
| ENGINE AND ENGINE COOLING:ENGINE:GASOLINE | 2 |
| VEHICLE SPEED CONTROL:ACCELERATOR PEDAL | 1 |
| FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY | 1 |
| ENGINE AND ENGINE COOLING:EXHAUST SYSTEM | 1 |
| ELECTRICAL SYSTEM:IGNITION | 1 |
| SUSPENSION:REAR | 1 |
| FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM | 1 |
Recent Complaints
20010123ENGINE AND ENGINE COOLING:ENGINE:GASOLINE
ENGINE WILL IDLE VERY HIGH AT STOPS AND WILL STALL WHEN TURNING. *SLC
20010123VEHICLE SPEED CONTROL
VEHICLE EXPERIENCES SUDDEN ACCELERATION WITHOUT WARNING, THE DEALER HAS BEEN UNSUCCESSFUL IN FINDING A REMEDY FOR THE PROBLEM. *SLC
19991025UNKNOWN OR OTHER
NO SUMMARY
19981111SUSPENSION:REAR
THE CAR CONSTANTLY STALLS UPON TURNING, DECELERATION, AND BRAKING, CAUSING NEAR TRAFFIC ACCIDENTS. CAR WAS CHECK OVER FOR MALFUNCTION, BUT TO NO AVAIL.THE REAR OF THE CAR IS SAGGING VERY BADLY, CAUSING ME TO HAVE TO REPLACE THE REAR BUMPER AND TAILPIPE. THE HEIGHT OF THE CAR FROM GROUND TO FRAME IS APPROX. 6 3/4 INCHES. THE CAR CONSTANTLY BOTTOMS OUT IN THE REAR EVEN WITHOUT A LOAD, SPRINGS HAVE BEEN REPLACED 4 TIMES AND THE CAR SAGS AFTER 3 MONTHS OR SOONER.
19981111FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM
THE CAR CONSTANTLY STALLS UPON TURNING, DECELERATION, AND BRAKING, CAUSING NEAR TRAFFIC ACCIDENTS. CAR WAS CHECK OVER FOR MALFUNCTION, BUT TO NO AVAIL.THE REAR OF THE CAR IS SAGGING VERY BADLY, CAUSING ME TO HAVE TO REPLACE THE REAR BUMPER AND TAILPIPE. THE HEIGHT OF THE CAR FROM GROUND TO FRAME IS APPROX. 6 3/4 INCHES. THE CAR CONSTANTLY BOTTOMS OUT IN THE REAR EVEN WITHOUT A LOAD, SPRINGS HAVE BEEN REPLACED 4 TIMES AND THE CAR SAGS AFTER 3 MONTHS OR SOONER.
19981019CrashVEHICLE SPEED CONTROL
CONSUMER HAD THE VEHICLE IN PARK, THEN PUT THE VEHICLE IN DRIVE, AND THE VEHICLE JUST TOOK OFF, CAUSING THE CONSUMER TO RUN IN A YARD AND WENT DOWN AN ENBANKMENT AND HIT A TREE. THE INSURANCE COMPANY CLAIM THAT THE THROTTLE GOT STUCK. *AK *ML
19980304ENGINE AND ENGINE COOLING:ENGINE:GASOLINE
WHEN COMING TO A STOP THE BRAKE PEDAL AND THE ACCELERATOR HAVE TO BE DEPRESSED TO KEEP THE VEHICLE FROM STALLING. *AK
19971229VEHICLE SPEED CONTROL
WHILE DRIVING VEHICLE ON WET SLUSHY TYPE PAVEMENT OWNER TOOK FOOT OF ACCELERATOR AND ENGINE CONTINUED TO REV. CAUSE HAS NOT BEEN DETERMINED. *AK
19970916ELECTRICAL SYSTEM:IGNITION
ENGINE FAILED TO START AFTER VEHICLE PARKED OVERNIGHT, CAUSE UNKNOWN, NOT CHECKED BY DEALER, SEARS CHECKED BATTERY/ALTERNATOR, NO PROBLEM. VEHICLE AVAILABLE FOR INSPECTION. *AK
19960923ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
EVP SENSOR CORE SYSTEM FAILED, KEEPING EGR VALVE OPEN, CAUSING ENGINE TO STALL. (FIRST VEHICLE ON 601573)
19960923STRUCTURE:BODY
HEAD LINER FABRIC/SUN VISORS HANGING DOWN, OBSCURING VISION.
19960923UNKNOWN OR OTHER
DASHBOARD VINYL CRACKED, DETERIORATED AND DISINTEGRATED, FALLING INTO SPEAKER OPENINGS, CREATING POTENTIAL FOR ELECTRICAL SHORT.
19960901FireELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD
DROVE 5 MILES, SHUT OFF ENGINE, RETURNED WITHIN 5 TO 6 MINUTES, FLAMES WERE COMING UP FROM UNDERHOOD IN AREA OF WINDSHIELD, FUEL INJECTED ENGINE. *AK
19960711FireFatalFUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY
VEHICLE EXPLODED INTO FLAMES WHEN HIT FROM BEHIND. *DH
19960429FireELECTRICAL SYSTEM:IGNITION:SWITCH
AFTER STARTING AUTO TO WARM IT UP THEN WALKED AWAY AND SUDDENLY IT BLEW UP AND BURNED EVERYTHING UNDER THE HOOD AND DASH. *AK
19960429FireELECTRICAL SYSTEM:IGNITION:SWITCH
AFTER STARTING AUTO TO WARM IT UP THEN WALKED AWAY AND SUDDENLY IT BLEW UP AND BURNED EVERYTHING UNDER THE HOOD AND DASH. *AK
19960418FireELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD
PARKED VEHICLE, SMOKE STARTED TO COME FROM UNDERNEATH THE HOOD. RESULTING IN VEHICLE FIRE BY FIREWALL NEAR THE MOTOR. *AK
19960418FireELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD
PARKED VEHICLE, SMOKE STARTED TO COME FROM UNDERNEATH THE HOOD. RESULTING IN VEHICLE FIRE BY FIREWALL NEAR THE MOTOR. *AK
19960404STRUCTURE:BODY
HEAD LINER IS LOOSE, BLOCKING VISIBILITY.
19960404ELECTRICAL SYSTEM:IGNITION:SWITCH
IGNITION SWITCH FAILS.
Compare 1984MERCURYGRAND MARQUIS to Similar Vehicles
NHTSA Investigations
Frequently Asked Questions
How many complaints does the 1984 MERCURY GRAND MARQUIS have?▼
The 1984 MERCURY GRAND MARQUIS has 24 NHTSA complaints, 2 crashes, 6 fires, 1 injuries, and 2 deaths reported.
What are the most common problems with the 1984 MERCURY GRAND MARQUIS?▼
The most-complained component for the 1984 MERCURY GRAND MARQUIS is STRUCTURE:BODY with 3 complaints. Other frequently reported areas include ELECTRICAL SYSTEM:IGNITION:SWITCH and ELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD.
Is the 1984 MERCURY GRAND MARQUIS safe to buy?▼
Review the complaint history, crash and fire reports, safety ratings, and recall status on this page to make an informed decision. No NHTSA crash test rating is available for this model year. Compare with other model years using the links above.
Where does this data come from?▼
All complaint, recall, and safety rating data is sourced from the National Highway Traffic Safety Administration (NHTSA). Complaints are filed by vehicle owners through NHTSA's Office of Defects Investigation.
Vehicle Safety Guides
Data as of 2025. Sources: NHTSA Office of Defects Investigation (ODI) complaints database, NHTSA recall campaign API, NHTSA NCAP crash-test ratings, and NHTSA FARS for fatality cross-reference.
Read our methodology — how this data is sourced, computed, and verified.