Spark Plugs: Removal
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Remove the spark plug wire. See SPARK PLUG WIRES . Loosen the spark plug 1 or 2 turns. Brush or using compressed air, blow away any dirt from around the spark plug. Remove the spark plug. If removing more than one plug, place each plug in a tray marked with the corresponding cylinder number.