GM 19301807 Spark Plug Asm

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When replacing spark plugs it's necessary to take note of the different engine models where the spark plugs are located at. Front side of the engine is where the spark plugs are on both 2.2L and 2.5-liter four-cylinder engines, whereas Quad-4 engines have them under a cover between the camshaft covers. The valleys between the camshafts on 3.4L V6 engines contain spark plugs, with three on each cylinder head. Other V6s have three up front and three in back, necessitating often turning of the engine forward for access purposes. Unbolt upper intake manifold to get to right (rear) spark plugs on 3.4L engines . A variety of tools are needed for spark plug replacement including a spark plug socket, extensions, gap gauge, and plug wire removal tool. A special tool is required for removing heat shields from spark plugs in 3800 V6 engines. Use a torque wrench to tighten down the new plugs and always let the engine cool before working on them.To install or reinstall new ones just thread them in by hand and then use a rubber hose for easy installation without any cross threading.Inspect the plug wires and use a twisting motion to attach them to the new plugs one at a time to avoid mix-ups.

It is important to allow the engine to cool before removing or installing spark plugs to prevent damage to the aluminum cylinder heads.

Attach the wire using a twisting motion until it's seated on the plug.

You can reference the Specifications section, the tune-up decal under the hood, or the owner's manual. Prioritize the information from the tune-up decal if there are any discrepancies.

While waiting, check the new plugs for defects and adjust the gaps.