Q: What is the importance of checking the spark plug wires when installing new spark plugs?
A: To begin with, post-2001 models have individual coils per plug, removing the need for secondary wires. For older models, check wires individually in a dim, ventilated area while the engine runs. Look for arcing or sparking in damaged areas and replace wires if necessary. Detach a wire, check for corrosion inside the boot, and ensure a snug fit.