Performing a tune-up on a 1995 Chevy pickup is necessary every 100,000 miles if your truck has platinum spark plugs. Otherwise, you should perform a tune-up every 24,000 miles. The tune-up consists of replacing the spark plugs and plug wires. The purpose of the plugs and wires is to deliver the ignition spark to each cylinder in the Chevy's engine at the end of the compression stroke so the air/fuel mixture will detonate and keep the engine running. A poor spark can prevent the air/fuel mixture from burning properly or keep it from igniting at all.
Open the Chevy pickup's hood by hand and support it with the prop rod. Gap all the spark plugs with a spark plug gapper. You may find the exact gap for your specific engine at the store where you buy the spark plugs.
Pull the spark plug wire off the spark plug in the engine's right front using the plug wire puller. Pull the wire off the ignition pack by hand.
Remove the exposed spark plug using the spark plug socket on a socket wrench. Apply a thin layer of dialectric grease to the threads on a new spark plug and thread it into the pickup's head with the socket wrench and spark plug socket.
Plug the first replacement spark plug wire into the ignition pack by hand. Plug the other end onto the new spark plug.
Repeat Steps 2 through 4 on the remaining three, five or seven spark plugs, depending on engine type: four-cylinder, six-cylinder or eight-cylinder. You may need the socket wrench extension to reach the rear plugs on an eight-cylinder engine. Close the pickup's hood.
