If you're the owner of a car with an NGK spark plug, you may be wondering if it's necessary to gap the plug. The answer is yes, NGK plugs need to be gapped. Here's why:
When an NGK spark plug is first manufactured, the electrode that protrudes from the side of the Plug is not set at the correct distance from the center electrode. This needs to be done so that when your engine is running and electricity is flowing through the electrodes, there will be a strong enough sparks to ignite the air/fuel mixture in your cylinders. If your NGK plugs are not correctly gapped, this could result in poor engine performance or even engine misfires.
Fortunately, gapping an NGK spark plug is a relatively easy process that can be completed in just a few minutes using a simple tool called a feeler gauge. Once you've determined what size gap you need (this info can usually be found in your car's owners manual), simply insert the appropriate sized blade on the feeler gauge between the electrodes until you reach slight resistance. This will ensure that your NGK spark plugs are properly gapped and ready to provide optimal performance for your vehicle.