The spark plugs of the V6 models are fixed between the two valve covers for each cylinder, while for the VB models, they are fixed at the right-hand side of the cylinder heads. These are mainly; Spark plug socket WHICH is a tool that is fitted onto a ratchet Various extensions A gap gauge THAT are used in checking the gaps on the new plugs A torque wrenchWhich is recommended when tightening the spark plugs. The best practice is to buy new plugs, gap them correctly and put one in, the right type of plug for the engine at a time. This must not be done while the engine is still hot so as to prevent damaging the aluminum cylinder heads that can be so fragile at this time: As you wait for the engine to cool you should look for defective plugs among the new ones and correct the gaps. This is done by inserting the proper thickness gauge between the electrodes at the tip of the plug and it should slide with a slight resistance. On the V6 models, the front and rear covers of the engine should be removed to work on all the ignition coils at once Only after that, the wiring from each coil should be disconnected, the bolts holding the coil to the valve cover loosened, and the coil removed from the valve cover. For V8 engines, with the engine cool, wait for the cooling fan to stop, then disconnect the spark plug wire from a plug pulling only on the boot, preferably with a removal tool. If you have compressed air available use it to blow the excess dirt that may be in the spark plug hole. Put the spark plug socket on the plug and take it off using a ratchet and an extension-it's done clockwise. How the condition of the engine and running of the car is determined by the spark plug is then compared to a chart and before the new plugs are fitted, a thin layer of anti-seize compound should be applied to the threads only. Put in the new plug until you can no longer turn it with your hand and then use a torque wrench and ratchet to snug it down using a short length of rubber hose to thread it in so you do not cross thread the block. Do the same for the other plugs then for V6 models, in the same sequence, fit the ignition coil, further tighten the retaining bolts and plug the electrical connector onto it. For the VB engine models, one should ensure that boot and wire are not damaged then plug wire with the help of twisting motion directly on a new spark plug and should be seated and then repeat the same for the remaining ones.