1984 Mercury Grand Marquis
US · Large Cars
The 1984 Mercury Grand Marquis is listed in the US market with gasoline power. Every figure below carries the source it came from, and anything our sources do not publish is left out rather than estimated.
- Engine
- Varies by configuration: 5.0L 8-cylinder (FFS), 5.0L 8-cylinder (FFS) CA model)
- Transmission
- 4-speed automatic
- Fuel
- Gasoline
- Economy
- 15 mpg (15.7 L/100 km) to 16 mpg (14.7 L/100 km) combined
Key Figures
Engine
| Specification | Value | Source |
|---|---|---|
| Engine | Varies by configuration: 5.0L 8-cylinder (FFS), 5.0L 8-cylinder (FFS) CA model) | |
| Displacement | 5.0 L | |
| Cylinders | 8 | |
| Fuel type | Gasoline | EPA fueleconomy.gov |
Transmission and drivetrain
| Specification | Value | Source |
|---|---|---|
| Transmission | Automatic | EPA fueleconomy.gov |
| Gears | 4 |
Fuel economy and range
| Specification | Value | Source |
|---|---|---|
| Combined | 15 mpg (15.7 L/100 km) to 16 mpg (14.7 L/100 km) | EPA fueleconomy.gov |
| City | 13 mpg (18.1 L/100 km) to 14 mpg (16.8 L/100 km) | |
| Highway | 19 mpg (12.4 L/100 km) to 20 mpg (11.8 L/100 km) |
Our sources do not publish these for this vehicle: Aspiration, Power, Torque, Drivetrain, Electric range, Battery capacity. We leave them out instead of estimating.
Trims and configurations
4 configurations listed by our sources. Engines, drivetrains and fuel economy can differ between them.
Recalls
NHTSA lists 2 recall campaigns for this model year. Last checked November 10, 2026.
07E064000: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
CERTAIN FEDERAL-MOGUL AFTERMARKET FUEL PUMPS SOLD UNDER THE BRAND NAMES OF CARTER, ACCUFLOW, NAPA, TRUFLOW, PARTS DEPO, AND PARTS MASTER, SHIPPED BETWEEN AUGUST 2006 AND JULY 2007 FOR USE ON THE VEHICLES LISTED ABOVE. THE FUEL PUMP DIAPHRAGM IN CERTAIN PRODUCTION RUNS MAY HAVE BEEN IMPROPERLY INSTALLED OR INADEQUATELY TESTED WHICH MAY CAUSE THE FUEL PUMP TO LEAK.
Remedy: FEDERAL-MOGUL WILL NOTIFY OWNERS AND REPLACE THE DEFECTIVE FUEL PUMPS FREE OF CHARGE. THE RECALL BEGAN ON OCTOBER 15, 2007. OWNERS CAN CONTACT FEDERAL-MOGUL AT 248-354-7700.
Reported August 27, 2007. View on NHTSA
83V134000: SEAT BELTS:FRONT:ANCHORAGE
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 ANCHORAGES".
Remedy: DEALERS WILL INSTALL NEW ATTACHING HARDWARE TO IMPROVE THE STRENGTH OF THE MOUNTING.
Reported December 20, 1983. View on NHTSA
Data sources
- EPA fueleconomy.gov · retrieved October 25, 2026 · US Government public data
- NHTSA vPIC · retrieved October 25, 2026 · US Government public data
Source checked: October 25, 2026
Data verified: October 25, 2026
Specifications can vary by market, trim, configuration and production date. Confirm with the manufacturer before buying parts or making safety decisions. Report an error.
Related vehicles
- 1985 Mercury Grand Marquis
Gasoline
5.0L 8-cylinder ((FFS)) · RWD
17 mpg (13.8 L/100 km)
Frequently asked questions
What engine does the 1984 Mercury Grand Marquis have?
Varies by configuration: 5.0L 8-cylinder ((FFS)), 5.0L 8-cylinder ((FFS) CA model). Engines can differ by trim, so check the trim list below.
What is the fuel economy of the 1984 Mercury Grand Marquis?
Combined fuel economy is 15 mpg (15.7 L/100 km) to 16 mpg (14.7 L/100 km), as published by the source shown in the specification table.
Are there recalls for the 1984 Mercury Grand Marquis?
NHTSA lists 2 recall campaigns for this model year (last checked November 10, 2026). Details are in the Recalls section.