![]() Don’t bend the ground strap more than 0.008” in either direction.Never exert any force on the center electrode or its ceramic insulator.Gently bend the ground electrode to widen or narrow the gap. Use the gap tool to adjust the spark plug gap size. If the feeler gauge or gap gauge (with the correct size) passes through the gap without touching any electrode, the gap is too wide and needs to be narrowed. If the feeler gauge or gap gauge can’t fit at the needed gap size, the plug gap needs to widen. Then, run the feeler gauge or gap gauge between the electrodes to determine the current measurement. Step 2: Measure Current Spark Plug GapĬheck the owner’s manual for the recommended gap size. In this case, use a wire brush with gentle motions to clean off debris, and never use abrasive materials. You’d want to avoid introducing dirt into the engine’s combustion chamber or have it weaken the ignition spark. However, old spark plugs may be dirty around contact points. If you have a new plug, this shouldn’t be an issue. Now, here’s how to do spark plug gapping: Step 1: Clean The Spark Plug A platinum or iridium plug has a delicate center electrode that can be damaged by the usual keyring-styled tool, so you’ll need a proper gapping tool to make adjustments.Īnd always - if you’re not familiar with spark plug installation, let a professional mechanic deal with it.Multiple electrode spark plugs are vehicle-specific and come with a factory gap that isn’t adjustable.For this task, you’ll need a gap tool like a feeler gauge or gap gauge. How To “Gap” Spark Plugs (Step-By-Step)īefore you begin gapping, make sure you have the right spark plug for your engine. Next, let’s see how you go about gapping a spark plug to its recommended gap. ![]() In all cases, the spark plug gap must be wide enough for a sufficiently energized spark, but not too wide that the spark skips at higher speeds - which will result in cylinder drag or engine rattling.
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