Let’s go through a couple of FAQs to understand the spark plug gap a bit more. But in a V8 engine, those 8 stock plugs would need gapping. Secondly, there’s no way to account for spark plug handling from its factory release until it gets to you.Īnd thirdly, the same spark plug can be specified for many different engines, but each engine may require a different gap size.Ī new spark plug could have a factory gap for a V6 engine, and you’d likely be able to install all 6 plugs as is. Why Should I Measure The Spark Plug Gap?įirstly, while manufacturers try to make stock plugs the same, it’s simply unrealistic in a mass-production environment. Now, you may wonder why you’d need to measure the spark plug gap, especially on a new plug. Any damage to either electrode means you’ll need a new spark plug. It’s durable, but it’s not meant to deal with lots of pressure and might snap off. However, you shouldn’t adjust the ground electrode more than 3 times. Repeat the adjustment until the gap tool fits closely between the spark plug electrodes. 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
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