These specifications will keep the engine from pre-ignition and detonation, which is the rapid and uncontrolled burning of the fuel in the combustion chamber while the piston is still rising. Any deviation from these specifications will move the engines optimal performance away from the engine’s best tune-up performance. To ensure an optimal gap, a feeler gauge should be used to adjust the plug. The engine designer has tested the engine on a dynamo to calculate the entire ignition system as a complete package for the engine’s best results. Improperly gapped spark plugs may not create sufficient sparks for the engine to get the proper power, or may create too large of a spark, resulting in the plug eventually burning out. When setting the spark plug’s gap for installation, use the automobile manufacturer’s recommended gap. IMHO.if the plug gap is set correctly and you have the correct heat-range. On the other hand, if the gap is too large the spark that does appear will be weak and may not be strong enough to ignite the charge. Gapping is mandatory for every vehicle while there are different gaps for different engines. Since I had a wire gap gauge that only went down to. 040 that they stated would come factory set. If you don’t gap a spark plug properly, it can cause the engine to misfire. New AC Delco 11-108 iridium plugs were all gapped significantly less than the. It would help if you used a dial gauge, which you can use to measure the gap between the. If the gap is too small, there is not enough room for enough of the air/fuel mixture to get between the electrode and ground strap, so when the plug does fire there is a chance nothing will ignite. Hi all, just put in new plugs on a recently purchased 2011 2.4l AWD. It would help find the proper spark plug gap to get maximum results. The critical distance between the spark plug’s electrode and the ground strap (that piece of steel that curves out over the end of the plug) is called the “plug gap.” The act of setting this distance correctly is commonly referred to as “gapping” your plugs. Step 2: Re-check the gap with a calibrated gapping tool. DO NOT LET THE PLIERS OR GAPPING TOOL TOUCH THE IRIDIUM CENTER ELECTRODE OR PORCELAIN. It will not exactly create new horsepower, but it will keep you from leaving some in the pits. Step 1: Use needle nose pliers or spark plug gapping tool to bend the ground strap up to the desired height. That is why checking the gap between the electrode and ground strap on every spark plug you use is important. Plus, there is no accounting how that plug is handled on all the steps along the path from the factory to your hands. The recommended spark plug gap is designed to be adequate for cold starting and smooth driving on a car that is in need of an engine tune up. While plug manufacturers try to produce every plug the same, doing that is about impossible in a mass-production environment.
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