How to Replace an Ignition Cylinder and Key on a 1991 Mercury Grand Marquis
Each ignition lock cylinder is designed specifically for one type of key. Replacing the cylinder in your car means also replacing the key with it, and you can only replace it with the key that comes with the cylinder. The ignition cylinder on a 1991 Mercury Grand Marquis is mounted to the steering column through a retaining pin, and it is one of the simpler types to replace in a car. Unless you can replace the door lock cylinders with duplicates of the new ignition cylinder, you will need two sets of keys for the car.
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Instructions
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1
Lift the hood and prop it open. Disconnect the negative (black) cable to the battery, loosening the clamp around the negative terminal with a wrench.
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2
Insert the ignition key into the lock cylinder and turn it to the "Run" position.
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3
Insert a 1/8-inch screwdriver or punch into the hole underneath the cylinder at the bottom of the steering column cover.
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4
Press the screwdriver or punch into the hole with one hand to depress the retaining pin while pulling on the key and cylinder to remove it from the steering column's housing.
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5
Insert the replacement key in the new lock cylinder. Insert the cylinder into the housing, making sure it's turned to the "Run" position. Push the retaining pin again and push the cylinder into position.
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6
Turn the cylinder back to the "Off" position once you know it is fully seated in the housing. Turn the cylinder to all positions to ensure that it is properly installed.
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7
Reconnect the negative cable to the battery. Close the hood.
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