Nissan 22401-JA01B Spark Plug

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According, the manufacturer does not recommend checking the spark plug gap on the vehicles equipped with the platinum- or iridium-tipped spark plugs since the said type of finish is quite fragile and can be easily damaged during the process, thus drastically reducing the said type of plugs' duration. The tools needed to change spark plugs include a spark plug socket that should be extended with a study ratchet, a wire type feeler gauge that is used to check gap on the new spark plugs and torque wrench that is used to tighten new spark plugs. During the process of replacing plugs, acquire new plugs, set individual plugs to the appropriate gap, and then change plugs singularly. Exam new plugs for imperfections, make certain that there are no cracks on the porcelain insulator of the plug. Using the wire gauge, measure the gaps of the electrodes; if any adjustments are required be sure to bend the side electrode and not harm the porcelain insulator. Make sure that the side electrode is corresponding to the central one, and if the base of the ground electrode rotated to side, rotate only the base of it. Before removing the spark plug, blow all the dirt or debris with compressed air around the spark plug area. For a 4-cylinder engine, the ignition coils have to be removed followed by the spark plugs using the sockets. While for a V6 engine, it is recommended that the upper intake manifold and ignition coils to be first to be removed, accompanied by the spark plugs. In either case, examine the old plugs in relation to a specified guide to determine the general status of the engine. lubricate the plug threads with anti-seize compound prior to installation but do not apply it to the lower threads; if forcing the spark plug through the rubber hose should be tightly over the spark plug to prevent cross-threading. Continue threading the plugs and then transmit the plug with the desired torque and repeat this to the other plugs. Once all plugs are replaced, reinstallation of the ignition coils should be done.

Check the electrode gaps using the wire gauge; if the gap does not slide between the electrodes with slight drag, the spark plug needs replacement.