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#BS-1984-MERMAR-E8B4

1984 Mercury MarquisProblems, Recalls & Reliability

Based on reports from 23 owners and 2 recalls for this exact model.

Data updated ·checked October 30, 2026 · NHTSA complaints through October 28, 2026

Complaints
23
Crashes
1
Fires
1
Recalls
2
TSBs
2
🟡

Preliminary Verdict

Think Twice

Based on 23 complaints, 1 crashes, 1 fires, and 2 recalls. Complaint rate is 4.9x the class average.

See full verdict with buy/skip conditions

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Mechanic Inspection Checklist

!Check the Electrical System:ignition:switchHIGH

6 owners reported electrical system:ignition:switch issues — failures commonly reported around 112K miles.

!Inspect the Fuel SystemMED
Look for symptoms of wear and premature failure
+ 6 more items in full checklistUnlock

30,000-Mile Cost Projection

Best Case

$X,XXX

Most Likely

$X,XXX

Worst Case

$X,XXX

Top cost driver: Electrical System:ignition:switch (6 reports).

Includes fuel costs, common repairs, and recall riskUnlock

Also in your report

Owner Intelligence

AI-synthesized themes from real complaints

Buyer Lot Checklist

Questions, test drive checks, walk-away triggers

Negotiation Talking Points

Data-backed dollar deductions

Buy / Skip Verdict

Final recommendation with conditions

10 sections total in the full reportUnlock all

Where the complaints fall

Electrical System:ignition:switch6 (26%)
Fuel System2 (9%)
Power Train:automatic Transmission2 (9%)
Power Train:automatic Transmission:park/neutral Start Interlock Switch2 (9%)
Structure:body2 (9%)
Engine And Engine Cooling:cooling System:radiator Assembly1 (4%)
Engine And Engine Cooling:engine:gasoline:belts And Associated Pulleys1 (4%)
Engine And Engine Cooling:exhaust System1 (4%)

1984 Mercury Marquis: Known Issues & Problem Areas

Electrical System:ignition:switch Issues

Electrical System:ignition:switch complaints account for 26% of all reports filed for the 1984 Mercury Marquis, with 6 owners filing complaints with NHTSA. The median mileage at time of complaint is 112,160 miles, suggesting issues tend to surface around the 112K-mile mark.

Fuel System Issues

Fuel System complaints account for 9% of all reports filed for the 1984 Mercury Marquis, with 2 owners filing complaints with NHTSA. Owners should pay attention to fuel system-related symptoms during test drives and pre-purchase inspections.

Power Train:automatic Transmission Issues

Power Train:automatic Transmission complaints account for 9% of all reports filed for the 1984 Mercury Marquis, with 2 owners filing complaints with NHTSA. Owners should pay attention to power train:automatic transmission-related symptoms during test drives and pre-purchase inspections.

Power Train:automatic Transmission:park/neutral Start Interlock Switch Issues

Power Train:automatic Transmission:park/neutral Start Interlock Switch complaints account for 9% of all reports filed for the 1984 Mercury Marquis, with 2 owners filing complaints with NHTSA. Owners should pay attention to power train:automatic transmission:park/neutral start interlock switch-related symptoms during test drives and pre-purchase inspections.

Data sourced from NHTSA owner complaints and community reports. The full report analyzes severity, repair costs, and failure patterns for each category.

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Repair costs • Negotiation scripts • Mechanic checklist • Buy/skip verdict

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Recall History (2 recalls)

07E064000Oct 2007

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.

83V134000Dec 1983

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".

Recall severity analysis & seller scripts

The full report rates each recall's severity and gives you scripts for asking the seller about recall completion.

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NHTSA Defect Investigations (3)

All closed. Investigations are how NHTSA decides whether a defect needs a recall.

EA86010ClosedOpened Mar 1986 · closed Jul 1989

SEATBACK FAILURE

SEATS

PE87028ClosedOpened May 1987 · closed Jan 1988

STALLING

ELECTRICAL SYSTEM

PE89039ClosedOpened Feb 1989 · closed Jun 1989

PARKING BRAKE FAILURE

PARKING BRAKE

1984 Mercury Marquis vs. Class Average (Midsize Cars)

This vehicle

23

Class avg

5

4.9x the class average — significantly more complaints than typical midsize cars vehicles.

Complaint counts correlate with sales volume — popular vehicles naturally generate more reports. The full report normalizes for this.

About this data

NHTSA Complaints

Federal database of owner-filed safety complaints. 23 records for this vehicle.

NHTSA Recalls

Manufacturer-issued safety recalls. 2 recalls found for this vehicle.

Repair Cost Data

Real-world repair costs from owner reports and independent databases.

Last updated (checked October 30, 2026). NHTSA complaints received through October 28, 2026.

Other Mercury Marquis Model Years

2004200320022001200019991998199719961995199419931992199119901989198819871986198519841983198219811979197719741973
View all Mercury Marquis years →

1984 Mercury Marquis: Frequently Asked Questions

What is the most common problem with the 1984 Mercury Marquis?
The most commonly reported issue with the 1984 Mercury Marquis is related to the electrical system:ignition:switch, with 6 complaints filed with NHTSA.
Is the 1984 Mercury Marquis reliable?
The 1984 Mercury Marquis has 23 complaints, 1 crash reports, and 1 fire reports filed with NHTSA. This is 4.9x the class average — higher than typical for its segment.
How much does it cost to fix 1984 Mercury Marquis problems?
Repair costs vary by issue. The full BumperScan report includes detailed repair cost estimates (low/median/high) for every major issue, plus a 30,000-mile total cost of ownership projection.
Does the 1984 Mercury Marquis have any recalls?
Yes, the 1984 Mercury Marquis has 2 recalls on record. The full report includes recall severity analysis and scripts for asking the seller about recall completion.
What mileage do Mercury Marquis problems start?
Based on 2 complaints with mileage data, the median mileage at time of complaint is 112,160 miles. The highest concentration of reported issues occurs in the 90–120K mile range. The full report breaks down exactly which components fail at each mileage bracket.
When was the 1984 Mercury Marquis data last updated?
BumperScan last checked this vehicle against NHTSA on October 30, 2026, covering owner complaints received through October 28, 2026 plus the latest recalls, investigations and technical service bulletins. Its numbers last changed on October 4, 2026.
What’s in the full report?
10 sections of AI analysis: severity-ranked issues, component scores (0-100), 30K-mile cost projection, failure timeline by mileage, recall details with seller scripts, owner sentiment analysis, mechanic checklist, buyer lot checklist, negotiation ammo with dollar figures, and a buy/skip verdict.
How is this different from free NHTSA data?
NHTSA gives you raw complaint text. BumperScan cross-references 2.1M+ complaints with community repair cost data, EPA fuel data, and recall records — then uses AI to synthesize it into actionable advice with dollar figures.
How is this different from Carfax?
Carfax is VIN-specific history ($45/report). BumperScan is model-level reliability intelligence — what problems this car is known for, what they cost, and whether you should buy it. Complementary, not competing.
What if the report isn’t useful?
100% money-back guarantee. If the report doesn’t help you make a more informed decision, we’ll refund you — no questions asked.
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