1991 Mercury Grand Marquis Repair and Maintenance

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

Repair Estimates

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1991 Mercury Grand Marquis
$
218
to $
395
1991 Mercury Grand Marquis
$
450
to $
723
1991 Mercury Grand Marquis
$
199
to $
326
1991 Mercury Grand Marquis
$
283
to $
389
1991 Mercury Grand Marquis
$
487
to $
617

1991 Mercury Grand Marquis Problems

Intake Manifold May Crack Leaking Coolant Behind the Alternator

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.

Throttle Position Sensors May Fail and Cause Engine Performance Problems

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.

Problem With Idle Air Bypass Valve May Cause Engine Performance Problems

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 accelerator pedal is not pressed.

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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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