![]() If the gap is too small, pull the body of the plug away from the disc with the electrode hanging on the lip to gently force the gap open and re-measure it. If the gap matches your required size, you’re good to install it in your vehicle. Rotate the disc until you feel a firm resistance and check the measurement next to the lip. Then, grab a gauge tool, and slide the recessed lip under the electrode sticking out from the base of the spark plug. Since every make and model requires a different gap size, start by looking in the owner’s manual for your vehicle to find the required gap size, or pull the information up online. If your spark plugs aren’t properly gapped, your engine may not burn fuel properly. These are effective to use while adjusting.Ī spark plug gap is the distance between the end of the electrode and the base of the spark plug. You can also use multiple blades to measure larger gaps. Built like a pocket-knife, this gauge features different blades of varying widths, some with wire on the end and some without, placed in the gap to check the spacing of the electrodes.
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