Having located the black cable, untwist and remove it from the negative terminal of the battery and locate the ignition coil pack and remove it / them. The tools required for spark plug replacement are a spark plug socket with a ratch or other attachments, other extensions, and a gap gauge for determining the gap on the new spark plugs and adjusting it, with a torque wrench advisable for use in tightening the new spark plugs. Since the spark plugs are normally put into sets, it is preferable to buy new spark plugs in advance, set them to the standard gap and replace them separately with the corresponding type for your engine. This way the aluminium cylinder heads are protected, do not remove any plug until the engine has totally cooled down. While waiting, ensure that the new plugs have no defects and to check for the gaps, slide the appropriate thickness gauge between the electrodes that is, use a tapered thickness gauge. if the gap is wrong then try to adjust the side electrode properly so that proper gap should be maintained but must not harm the porcelain insulator. This is an excellent opportunity to blow out any debris depositing in the spark plug hole; then introduce the spark plug socket over the plug and unscrew the latter in anti-clockwise direction. Check other spark plugs given to you for comparison with the removed one in order to gauge the running condition of the engine. It is advised to smear a small amount of anti-seize compound on the threads of a new spark plug and screw it in until it is no longer loose then using a torque wrench or ratchet tighten it. Rubber hose of rather short size may be used on the threads of the plug to prevent cross threading when threading the plug into place. Do the same for the rest of the spark plugs then replace the ignition coil pack(s).