1984 Mercury Grand Marquis Problems
- Complaints
- 15filed with NHTSA
- Median mileage
- —no mileage reported
- Recalls
- 1campaigns on record
- Trend
- StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
- NHTSA crash rating
- —overall rating starts with 2011 models
- EPA fuel economy
- 16 mpgcombined, 5.0L 8-cyl · 14 city / 20 hwy
Sources: NHTSA records for the 1984 Mercury Grand Marquis (complaints, recalls, investigations), EPA fuel economy. Report an error
NHTSA recorded 15 consumer complaints for the 1984 Mercury Grand Marquis. The part named most often is electrical system, with 5 complaints (33% of the total), followed by engine cooling (5) and vehicle speed control (4). Of all complaints, 2 involved a crash, 4 a fire, 1 an injury, 2 a death, according to the filers. NHTSA lists 1 recall campaign and 0 technical service bulletins for this model year.
This model year has fewer than 25 complaints on record, so the numbers below can change a lot with a few new reports.
Which parts are reported most
Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.
- Electrical system5 33%
- Engine cooling5 33%
- Fuel system2 13%
- Other or unknown2 13%
- Body and structure2 13%
- Suspension1 6.7%
Example complaints
Electrical system: “Engine failed to start after vehicle parked overnight, cause unknown, not checked by dealer, sears checked battery/alternator, no problem. Vehicle available for inspection.”
NHTSA complaint #816383, filed 1997-09Vehicle 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.”
NHTSA complaint #829142, filed 1998-10Fuel 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.”
NHTSA complaint #700505, filed 1998-11Complaints by year filed
Trend: stable. Complaints filed in the last 3 full calendar years are within 25% of the 3 years before.
Fuel economy and running cost
EPA ratings for each 1984 Mercury Grand Marquis version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).
| Version | Engine | Transmission | City | Hwy | Comb. | Fuel / yr |
|---|---|---|---|---|---|---|
| Grand Marquis | 5.0L 8-cyl | 4-speed automatic | 14 | 20 | 16 | $4,200 |
| Grand Marquis | 5.0L 8-cyl | 4-speed automatic | 13 | 19 | 15 | $4,450 |
| Grand Marquis Wagon | 5.0L 8-cyl | 4-speed automatic | 14 | 20 | 16 | $4,200 |
| Grand Marquis Wagon | 5.0L 8-cyl | 4-speed automatic | 13 | 19 | 15 | $4,450 |
Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.
Recalls and investigations
- 83V134000Dec 20, 1983Seat belts › Front › AnchorageCovers: Mercury Grand Marquis 1984, Marquis 1984, Ford Escort 1984 +15 more
The bolts that attach the d-shaped ring for the shoulder belt are inadequately supported by the material in which they are mounted. The attachment does not comply with the requirements of federal motor vehicle safety standard no. 210, "seat belt assembly…
Recall details for the 1984 Mercury Grand Marquis → · Check a VIN at nhtsa.gov/recalls
Technical service bulletins
No technical service bulletins are on record for the 1984 Mercury Grand Marquis.
Other model years of the Mercury Grand Marquis
| Year | Complaints | Median mi | Recalls | Crash ★ | MPG | Score (50 = typical) | Trend |
|---|---|---|---|---|---|---|---|
| 2011 | 9 | 83,750 | 2 | — | 19 | — | Not enough data |
| 2010 | 25 | 36,000 | 2 | — | 19 | 42 · Typical | Rising |
| 2009 | 26 | 33,000 | 2 | — | 19 | 50 · Typical | Rising |
| 2008 | 80 | 46,330 | 3 | — | 18 | 84 · More | Falling |
| 2007 | 96 | 29,430 | 3 | — | 18 | Not compared (before 2008) | Falling |
| 2006 | 143 | 63,706 | 2 | — | 18 | Not compared (before 2008) | Falling |
| 2005 | 488 | 72,800 | 4 | — | 19 | Not compared (before 2008) | Rising |
| 2004 | 348 | 82,000 | 1 | — | 18 | Not compared (before 2008) | Stable |
| 2003 | 362 | 85,194 | 1 | — | 18 | Not compared (before 2008) | Stable |
| 2002 | 78 | 51,000 | 0 | — | 18 | Not compared (before 2008) | Falling |
| 2001 | 157 | 71,000 | 3 | — | 18 | Not compared (before 2008) | Falling |
| 2000 | 162 | 73,825 | 6 | — | 18 | Not compared (before 2008) | Falling |
| 1999 | 164 | 103,000 | 3 | — | 18 | Not compared (before 2008) | Falling |
| 1998 | 143 | 84,700 | 5 | — | 18 | Not compared (before 2008) | Falling |
| 1997 | 316 | 80,436 | 4 | — | 18 | Not compared (before 2008) | Falling |
| 1996 | 239 | 84,263 | 5 | — | 18 | Not compared (before 2008) | Rising |
| 1995 | 179 | 89,000 | 5 | — | 18 | Not compared (before 2008) | Stable |
| 1994 | 156 | 99,000 | 3 | — | 18 | Not compared (before 2008) | Stable |
| 1993 | 144 | 90,000 | 3 | — | 19 | Not compared (before 2008) | Falling |
| 1992 | 255 | 114,000 | 3 | — | 20 | Not compared (before 2008) | Stable |
| 1991 | 82 | 79,994 | 1 | — | 18 | Not compared (before 2008) | Stable |
| 1990 | 56 | 89,000 | 0 | — | 18 | Not compared (before 2008) | Stable |
| 1989 | 58 | 75,250 | 1 | — | 18 | Not compared (before 2008) | Stable |
| 1988 | 73 | 94,000 | 2 | — | 18 | Not compared (before 2008) | Stable |
| 1987 | 43 | 131,200 | 4 | — | 19 | Not compared (before 2008) | Stable |
| 1986 | 21 | — | 1 | — | 19 | — | Stable |
| 1985 | 21 | 87,000 | 0 | — | 17 | — | Stable |
| 1984 | 15 | — | 1 | — | 16 | — | Stable |
| 1983 | 7 | 74,000 | 2 | — | — | — | Not enough data |
All Mercury Grand Marquis model years · Best and worst years by complaints
Frequently asked questions
How many NHTSA complaints does the 1984 Mercury Grand Marquis have?
NHTSA recorded 15 consumer complaints for the 1984 Mercury Grand Marquis as of Nov 1, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
What part of the 1984 Mercury Grand Marquis is reported most often?
Electrical system is named most often, in 5 complaints (33% of the total), followed by engine cooling with 5.
Has the 1984 Mercury Grand Marquis been recalled?
NHTSA lists 1 recall campaign for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.
What gas mileage does the 1984 Mercury Grand Marquis get?
The EPA rates the 1984 Mercury Grand Marquis (Grand Marquis, 5.0L 8-cyl) at 16 mpg combined, 14 city and 20 highway, with an estimated annual fuel cost of $4,200 at 15,000 miles a year. Other engine and drive versions are rated differently.
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Nov 1, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Fuel economy is from the EPA and DOE (fueleconomy.gov).
Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.