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Spark plug gap is where spark plug spark discharge is designed to take place. On a conventional spark plug, it is the area between the center and the ground electrode.
if the oil is at the spark plug base the valve cover gasket is leaking. if the spark plug electrode is covered with oil the engine needs rings
The surface of the piston facing the spark plug electrode.
The surface of the piston facing the spark plug electrode.
Running too lean
The metal section at the bottom of a spark plug is called the shell. The components of a spark plug are the center electrode, an insulator, a metal shell, and side electrodes.
If you mean on the exterior of the spark plug then the valve cover gasket is leaking. If it is on the electrode of the plug you are burning oil.
If you have no gap meaning the electrodes are touching then the spark plug is being grounded therefore causing a no spark situation. There has to be a gap in order for the electricity to jump from the electrode to the ground.
They're almost the same plug - according to NGK's spark plug guide the S has a standard 2.5mm electrode and the A is a 'special design' - no more info given than that!
The electrodes of a good spark plug are sort of tan in color, and the center electrode, if there is one, has a fairly sharp edge all the way around. A bad spark plug can be black, or oily black, and the electrodes may be black-ish even down inside the ceramic where the center electrode comes out. The electrode edges may be worn down and rounded. A bad spark plug will not have a continuous path from where the spark plug wire attaches to the center electrode. This can be checked with an ohm-meter. If you're still not sure, it is best to replace spark plugs - they have a definite effect on power and gas mileage.
The standard spark plug gap for a 1996 Subaru Impreza 2.2 L is 0.040. The gap is the distance between the tip of the spark plug and the electrode inside.
there will, no spark because of one of the following reason; 1 disconnected wire. 2 problem of fly wheel and coil. 3 no gap between ground electrode and terminal