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1991 Mercury Grand Marquis Problems

Find the most common issues based on 1991 Mercury Grand Marquis owner complaints.
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Most Common 1991 Mercury Grand Marquis Problems

The 1996-2001 Mercury Grand Marquis with a 100% plastic intake manifold is known for engine overheating, even with normal use, and a coolant leak from the front of the manifold. This will often tr...
A spring in the seat belt buckle may wear or fail, causing the airbag light on the instrument panel to illuminate. Failed buckles will require replacement.
The throttle position sensor (TPS) may fail. Common symptoms of a defective TPS can be rough idle, hard starting, hesitation on acceleration, poor fuel economy, and stalling.
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Common 1991 Mercury Grand Marquis Repair Estimates

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0 Known 1991 Mercury Grand Marquis Brakes Problems

0 Known 1991 Mercury Grand Marquis Drive Train Problems

2 Known 1991 Mercury Grand Marquis Electrical & Lights Problems

A spring in the seat belt buckle may wear or fail, causing the airbag light on the instrument panel to illuminate. Failed buckles will require replacement.

5 Known 1991 Mercury Grand Marquis Engine Problems

The 1996-2001 Mercury Grand Marquis with a 100% plastic intake manifold is known for engine overheating, even with normal use, and a coolant leak from the front of the manifold. This will often tr...
The throttle position sensor (TPS) may fail. Common symptoms of a defective TPS can be rough idle, hard starting, hesitation on acceleration, poor fuel economy, and stalling.
The EGR valve position (EVP) sensor can fail on this vehicle. The EVP sensor measures the EGR valve position and transmits the date to the engine control computer. If it fails, drivability and fuel...

0 Known 1991 Mercury Grand Marquis Exhaust & Emissions Problems

0 Known 1991 Mercury Grand Marquis Heating & Air Conditioning Problems

0 Known 1991 Mercury Grand Marquis Maintenance Problems

0 Known 1991 Mercury Grand Marquis Miscellaneous Problems

0 Known 1991 Mercury Grand Marquis Suspension & Steering Problems

7
Known 1991 Mercury Grand Marquis Problems & Complaints

The 1996-2001 Mercury Grand Marquis with a 100% plastic intake manifold is known for engine overheating, even with normal use, and a coolant leak from the front of the manifold. This will often tr...
A spring in the seat belt buckle may wear or fail, causing the airbag light on the instrument panel to illuminate. Failed buckles will require replacement.
The throttle position sensor (TPS) may fail. Common symptoms of a defective TPS can be rough idle, hard starting, hesitation on acceleration, poor fuel economy, and stalling.
If you experience difficulty starting the engine when cold, stalling at idle, or hesitations during acceleration, it may be the idle air bypass valve. This valve helps the vehicle idle steady when ...
The EGR valve position (EVP) sensor can fail on this vehicle. The EVP sensor measures the EGR valve position and transmits the date to the engine control computer. If it fails, drivability and fuel...
It is not uncommon for the intake manifold and/or valve cover gaskets to develop a coolant or oil leak. Leakage from the intake manifold may result in coolant in the engine oil. Coolant mixing with...
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