GM 12681662 Spark Plug

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They are mounted on the cylinder head(s) and the equipment required to change them are a spark plug socket compatible with a ratchet, various extensions, a gap wire used to check the gap of the new spark plugs and a torque meter used in tightening. It is also good to have new plugs and adjust their gap before fitting them; it is also recommended that they need to be changed one at a time so as to ensure that the correct type is provided for the specific engine. It is advisable not to pull out the removed plugs until the engines have cooled when already on the garage floor make sure that the new plugs do not have any defects and that the gap is right. Using the proper thickness-gauge one checks the gap and if the gap is to be adjusted, then one should bend the side electrode properly because bending it roughly may cause some harm to the porcelain insulator. For V6 models, air intake duct could be detached and on V8 models, rear bank ignition coil mounting bracket could be unbolted to provide good access to the rear spark plugs. When disconnected the spark plug wire, pull only the boot, if necessary twirl compressed air to blow into the spark plug hole. To take off the spark plug, use the socket and turn it anti-clockwise, then examine the old plug relative to the new spark plugs for the condition of the engine when running. If one is changed with bare hands, screw in a new plug until the last turns are very tight, then tighten it to preset standards with the help of a torque wrench or a ratchet; a short rubber hose is useful to thread it home without risk of cross-threading. Before fitting the spark plug wire to the new plug turn it round and round in order to have a tight connection for all the spark plugs in place so as not to confuse the wires while replacing each of the plugs separately.

They are mounted on the cylinder head(s) and the equipment required to change them are a spark plug socket compatible with a ratchet, various extensions, a gap wire used to check the gap of the new spark plugs and a torque meter used in tightening. It is also good to have new plugs and adjust their gap before fitting them; it is also recommended that they need to be changed one at a time so as to ensure that the correct type is provided for the specific engine. It is advisable not to pull out the removed plugs until the engines have cooled when already on the garage floor make sure that the new plugs do not have any defects and that the gap is right. Using the proper thickness-gauge one checks the gap and if the gap is to be adjusted, then one should bend the side electrode properly because bending it roughly may cause some harm to the porcelain insulator. For V6 models, air intake duct could be detached and on V8 models, rear bank ignition coil mounting bracket could be unbolted to provide good access to the rear spark plugs. When disconnected the spark plug wire, pull only the boot, if necessary twirl compressed air to blow into the spark plug hole. To take off the spark plug, use the socket and turn it anti-clockwise, then examine the old plug relative to the new spark plugs for the condition of the engine when running. If one is changed with bare hands, screw in a new plug until the last turns are very tight, then tighten it to preset standards with the help of a torque wrench or a ratchet; a short rubber hose is useful to thread it home without risk of cross-threading. Before fitting the spark plug wire to the new plug turn it round and round in order to have a tight connection for all the spark plugs in place so as not to confuse the wires while replacing each of the plugs separately.

Spark plugs are situated in the cylinder heads and tools required for spark plugs replacement are a spark plug socket that fits on a ratchet; a number of extensions and a gap gauge which is used to check and set the gaps on new spark plugs. New plugs should be tightened by using torque wrench. New plugs should be bought beforehand, installed to the required gap and fitted a single one at a time to ensure that the proper type of plug is used for the particular type of engine. With the aluminium cylinder heads, race the engine for an hour or until it cools and then remove the plugs to start the scrapping process. While waiting, check and strip new plug for defects and measure the gap between electrodes by using the gauge of proper thickness If a gap is necessary then making slight bending of the side electrode is done in such a way that the porcelain insulator is not to be damaged. On the four-cylinder and 3.6L V6 models, each ignition coil must come out first before the spark plug wire can be pulled on 3.5L and 3.9L V6 models, only the spark plug wire boot should be pulled. The area around the spark plug must be clean, if possible, blow any dirt from the spark plug hole then place the spark plug socket in place and turn it counter clockwise. Don't work on the old spark plug but check on the running condition of the engine and replace the plug with a new one that cannot be turned by hand and then tighten it with a torque wrench or a ratchet. A small section of rubber hose can be employed to ease the threading of the plug and also protect threads to avoid their damage. There are 4 more spark plugs on the engine; perform the same process on all of them.