Introduction
This guide demonstrates how to replace the spark plugs in a 2002 GMC Sierra. Spark plugs need to be replaced every few years. We advise to remove and replace the spark plugs one at a time.
When re-installing the new spark plugs, do not over-tighten them! Also, make sure that your truck has cooled under the hood if the vehicle was recently turned off.
Before starting, make sure your truck is off and in park. Securely prop the hood up to ensure safety during the repair. Lastly, disconnect the car battery.
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Open the hood of your truck using the lever on the drivers side of the cab by the parking brake.
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Locate the spark plugs on the engine. (4 spark plugs on each side, 8 total, covered by a spark plug boot)
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Using the socket wrench , extension, and a 5/8 inch socket, place the socket over the spark plug. Using counter clock-wise motion, unscrew the spark plug with the socket wrench.
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To reassemble your device, follow these instructions in reverse order.
