Problems for specific Mercury Grand Marquis years:

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Newest reported 1997 Mercury Grand Marquis problems

 

Verified for the Mercury Grand Marquis

Bad spark plugs or an ignition coil can cause ignition misfire, which will illuminate the Check Engine Light.

5 Reports
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Reported by bearmug and 109 others for the Mercury Grand Marquis

The car had 64600 miles on it and the headlights started going out while driving, which can be very dangerous. The problem is in the Light Control Module which is an expensive part (around $500 to $600 + labor).

110 Reports
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Verified for the Mercury Grand Marquis

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 economy can suffer, the Check Engine Light will commonly illuminate.

15 Reports
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Verified for the Mercury Grand Marquis

The composite (plastic) intake manifold may crack near the thermostat housing and cause a coolant leak. Ford released an updated manifold that was reinforced to prevent a recurrence. No recall was issued for this problem but Ford did extend the warranty to seven years on some models from the date of purchase.

94 Reports
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Verified for the Mercury Grand Marquis

An oil leak may develop from the the right side head gasket.  Oil from this type of leak will commonly drip onto the starter. Our technician tell us an updated head gasket is available to correct this concern.

10 Reports
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Verified for the Mercury Grand Marquis

The heater hose outlet may leak coolant at the back of the intake manifold. Sometimes this is misdiagnosed as a leaking intake manifold gasket because it resembles a leaking manifold.

22 Reports
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Reported by badbert and 1 other for the Mercury Grand Marquis

new converter

2 Reports
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