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The 2003 Mercury Grand Marquis is a classic sedan featuring a powerful 4.6-liter V8 engine with 300 horsepower. Manufactured by Ford Motor Company of Canada, this model is equipped with safety features like front and side airbags for the first row. With a dual overhead cam valve train design, it delivers a robust performance typical of its era. The vehicle was produced in Ontario, Canada, at the St. Thomas plant.

Decoded VIN:

Make

MERCURY

Manufacturer Name

FORD MOTOR COMPANY OF CANADA, LTD.

Model

Grand Marquis

Model Year

2003

Plant City

TALBOTVILLE

Series

Vehicle Type

PASSENGER CAR

Plant Country

CANADA

Plant Company Name

St. Thomas

Plant State

ONTARIO

Body Class

Sedan/Saloon

Doors

Gross Vehicle Weight Rating From

Class 1: 6,000 lb or less (2,722 kg or less)

Gross Vehicle Weight Rating To

Class 1: 6,000 lb or less (2,722 kg or less)

Engine Number of Cylinders

Displacement (CC)

4600.0

Displacement (CI)

280.70922283576

Displacement (L)

4.6

Fuel Type - Primary

Gasoline

Valve Train Design

Dual Overhead Cam (DOHC)

Engine Configuration

V-Shaped

Engine Brake (hp) From

300

Other Engine Info

Engine Code "V" available on Mercury Marauder Only

Engine Manufacturer

Ford

Seat Belt Type

Manual

Curtain Air Bag Locations

1st Row (Driver and Passenger)

Front Air Bag Locations

1st Row (Driver and Passenger)

Side Air Bag Locations

1st Row (Driver and Passenger)

Most common problems:

Oil leaks

The V8 engines in older models like the 2003 Mercury Grand Marquis can develop oil leaks, often from the valve cover gaskets or oil pan gaskets.

Cooling system issues

The age of the vehicle can lead to problems with the cooling system, including radiator failures, thermostat issues, or leaks in the hoses.

Intake manifold cracking

The plastic intake manifolds used in some Ford V8 engines, including the one in the 2003 Grand Marquis, are prone to cracking and leaking coolant.

Spark plug blowouts

The V8 engines in this model have been known to suffer from spark plug blowouts due to insufficient thread engagement in the cylinder heads.

Timing chain wear

Over time, the timing chain and associated components can wear out, leading to poor engine performance or even failure.

Fuel pump failure

Older vehicles like the 2003 Grand Marquis may experience fuel pump issues, leading to engine stalling or difficulty starting.

Egr valve problems

Exhaust Gas Recirculation (EGR) valves can become clogged or fail, leading to rough idling or poor engine performance.

Mass air flow sensor failure

The Mass Air Flow (MAF) sensor can become dirty or fail, causing issues with air-fuel mixture and engine performance.

Catalytic converter failure

The catalytic converters in older vehicles can become clogged or fail, leading to poor engine performance and failed emissions tests.

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