What is the first step in the process of replacing spark plugs?

The first step in the process of replacing spark plugs is to remove the ignition wires. This action is crucial because it ensures safety and prevents damage to the ignition system. By disconnecting the ignition wires first, you minimize the risk of accidentally causing a short circuit or creating a spark while working on the engine. It also allows for better access to the spark plugs themselves, making the replacement process smoother.

Once the ignition wires are safely removed, you can then proceed to unscrew the old spark plugs and follow through with the installation of the new plugs, ultimately reconnecting the wires to complete the process. However, starting with the ignition wires is fundamental to a safe and effective spark plug replacement.