Step 1
Remove the spark plug wires. Use a spark plug wrench to remove the spark plugs from their chambers.

Step 2
Clean the spark plug if you are not replacing it with a new one. Remove all dirt and debris from the spark plug. If your doing all this you might as well replace them.

Step 3
Check the owner's manual for your car to find out the recommended gap setting, or call your parts store and ask what is the recommended gap setting for your year car.

Step 4
Use a gap tool to check the gap of the spark plug. Slip the tool between the ground electrode and center electrode. The gap tool should fit snugly at the recommended gap width indicated on the tool.

Step 5
Push the tool between the electrodes a few times to ensure proper gap. If the gap is too wide, push the ground electrode firmly against a flat surface to narrow the gap and then check again with the gap tool.

Step 6
Repeat Step 5 as necessary until you reach the correct gap. apply antil-seize lubricant around threads of the plugs reseat the spark plug torque plugs to 20 ft/lbs and reattach the spark plug wires.