Anti-seize can alter the tightening torque up to 20%, increasing the risk of breakage.Ĭhanging the electrode gap is called a spark plug gapping. The nickel coating on most modern spark plugs provides added protection from seizing in aluminum cylinder heads and has made anti-seize less important in spark plug installations. Should I use anti seize on spark plugs in aluminum heads? Ideal for use with iridium spark plugs and other plugs containing precious metals, feeler gauges are more accurate than other types. The heat range of a spark plug is defined as its ability dissipate heat from the tip.”Ĭan you check spark plug gap with feeler gauge?įeeler Gauge With a wide variety of blades or wires, you’ll be able to measure almost any gap. Properly gapped spark plugs also remove heat from the cylinder ignition chamber. Spark plugs that are not gapped properly will cause the engine to either skip firing, or ignite too soon in the compression stroke. What happens if my spark plugs arent gapped correctly? Should you decide to re-gap your Iridium Power plug, use extreme caution as improper gapping may damage or destroy the Iridium center electrode or porcelain center. In most cases your Iridium Power plugs do not need to be gapped. The incorrect spark plug gaps can cause uneven firing of individual spark plugs and delay engine combustion both of which can cause an engine to miss or idle erratically. What happens if spark plugs are not gapped properly?Įngine Missing Spark plugs that are gapped incorrectly can cause an engine to miss, or run erratically, especially during idle. It’s the best tool for measuring and adjusting the spark plug spacing. The blades look like a pocket knife when joined together. What is the preferred tool for measuring spark plug gap?Ī feeler gauge is made up of a collection of calibrated metal strips of varying thicknesses. Most spark plug manufacturers will pre-gap their spark plugs for their most popular application but considering that same spark plug might fit over a hundred different vehicles or engines, checking that it matches your vehicle’s specifications is a good idea. Gap new as well as old spark plugs, even if the package says that the new plugs are “pre-gapped.” To avoid problems, work on only one plug at a time, in cylinder sequence order. You need a feeler gauge to gap your spark plugs properly. It is advisable to double check that the gap is correctly set to the vehicle’s recommended setting when installing spark plugs. In the past, it was necessary to gap spark plugs, but today spark plugs are usually pre-gapped. Do Spark Plugs Always Have to Be Gapped? Not always.
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