1991 Mercury Grand Marquis Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1991 Mercury Grand Marquis

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1991 Mercury Grand Marquis Problems

Malfunctioning Headlights

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).

Coolant Leak and/or Engine Overheating Due to Cracked Intake Manifold

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.

EVP Sensor Failure May Cause Drivability/Fuel Economy Issues

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.

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1991 Mercury Grand Marquis Recalls

Recall 91V048000
THE PARK ROD ASSEMBLY CONTAINS A PARK CAM WITH INADEQUATE SURFACE HARDNESS, WHICH COULD LEAD TO PARK DISENGAGEMENT OR NO PARK ENGAGEMENT WHEN THE LEVER IS PLACED IN PARK.
Recall 90E043001
THREADED INFLATOR COMPONENTS MAY HAVE BEEN DAMAGED DURING ASSEMBLY WHICH MAY ALLOW COMPONENTS TO SEPARATE WHEN INFLATOR RECEIVES A SIGNAL TO DEPLOY THE AIR BAG.

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1991 Mercury Grand Marquis Reviews

Bought this used with just under 100,000 miles on it. Not running right when I purchased it but did some work to it and it's been a very good car. I beefed up the rear suspension with coil over shocks and Moog cargo coil springs plus the addition of a police rear sway bar (badly needed for these large cars). I would like to stiffen up the front suspension and it would be a pretty nice handling ...
ilove this car
my tranny has reverse but no forward gear does it need to be rebuilt or just an overhaul? Other than that i love it only has 34,500 miles.

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