- 1). Open the 1981 Mercury Grand Marquis's hood and support it with the prop rod. Remove the wing nut holding the air cleaner lid in place by hand. Remove the air cleaner lid by hand.
- 2). Remove the air filter and air cleaner base by hand. Start the engine.
- 3). Turn the idle adjustment screw, located on the front of the carburetor, to adjust the idle speed. Turn the screw clockwise to raise the idle speed, counterclockwise to lower it. Verify the idle is set where you want it on the tachometer.
- 4). Reinstall the air cleaner base, air filter, air cleaner lid and air cleaner wing nut by hand. Close the Grand Marquis' hood.
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