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2003 MERCURY Grand Marquis
Vehicle Summary
The 2003 Mercury Grand Marquis, manufactured by Ford Motor Company of Canada, Ltd., is a classic sedan with a V-shaped 8-cylinder engine delivering 300 horsepower. This model features a 4.6-liter gasoline engine with dual overhead cam (DOHC) valve train design for improved performance. Safety features include front, side, and curtain airbags for both the driver and passenger in the first row. As a spacious 4-door passenger car, it offers comfort and reliability.
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2003 MERCURY Grand Marquis
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Complete Specifications
Known Issues for This Vehicle
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.
