GMC 12681658 Spark Plug Assembly, Gas Eng Ign

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Disconnect the cable from the negative battery terminal and remove the ignition coils. You'll need a spark plug socket, extensions, a gap gauge, and a torque wrench. Buy the right spark plugs for your engine and adjust them to the correct gap. Let the engine cool before removing the plugs. Check the new plugs for defects and adjust the gaps. Use compressed air to clean the spark plug hole. Remove the old plugs with a socket and ratchet. Install the new plugs, tighten them with a torque wrench, and apply anti-seize compound to the threads. Repeat for all spark plugs and reinstall the ignition coils.

You will find Spark Plugs located threaded into the top (3.6L V6) or the side (3.4L V6) of each Cylinder Head, so remove the air intake duct for a 3.6L V6; otherwise, you can check it out from here! You will need specific tools including spark plug socket, extension, and gap gauge for adjusting the gaps as required. It is recommended not to start until the engine is completely cold. Examine new plugs for defects and adjust their gaps using a gauge whose measurements are provided in the gap specifications section. Carefully bend the side electrode without breaking off any porcelain insulator if required. Avoid scratching these platinum or iridium coatings on these electrodes. If your engine is a 3.6L V 6 take out ignition coils or rather untwist boots and pull them off since in case of having a 3.4 L V 6 engine remove spark plug wires by simply twisting and pulling off boots." Use compressed air around plugs in order to avoid any dirt falling into cylinders."Fit spark plug socket over plug to be removed, turn counterclockwise and then compare against chart supplied showing how engine should run." A thin coat of anti-seize compound should be applied before installing new plugs."Install a new plug into hole, thread it tight with torque wrench / ratchet using short piece rubber hose for assistance". Finally put back ignition coil or set spark plug wire on each other after you have done this process for all remaining spark plugs.

You will need specific tools, including a spark plug socket, extensions, and a gap gauge for gap adjustment.