Parts for your 2018 Subaru Exiga-Ignition leads

Ignition Leads and the 2018 Subaru Exiga: What You Need to Know

The 2018 Subaru Exiga is designed with modern engine technology that moves away from traditional ignition leads. In fact, ignition leads are not used on this vehicle. Instead, the 2018 Subaru Exiga employs a coil-on-plug (COP) ignition system. This setup places individual ignition coils directly on top of each spark plug, meaning there is no need for ignition leads to carry the electrical current from a central distributor or coil pack.

Why are ignition leads not used on the 2018 Subaru Exiga? It all comes down to the evolution of vehicle ignition systems. Older vehicles typically had ignition leads to connect the distributor or coil pack to the spark plugs. These leads were responsible for carrying high voltage electricity needed to ignite the air-fuel mixture in the engine. However, ignition leads can degrade over time due to heat, oil and general wear, potentially causing misfires and poor engine performance.

The coil-on-plug system found on the Exiga eliminates many of those potential problems. By seating the ignition coil directly on the spark plug, the chance of voltage loss or interference is significantly reduced. This design results in more reliable sparking, improved engine efficiency, smoother running, and easier maintenance. The absence of ignition leads also means one less component to check or replace as part of routine servicing.

While the 2018 Subaru Exiga does not use ignition leads, understanding their purpose and maintenance can still be helpful for owners of older vehicles or those interested in automotive technology. Ignition leads, commonly known as spark plug wires, were once a key component in ensuring the engine fired correctly. They carry the high voltage from the ignition coil or distributor to the spark plugs, ensuring a timely spark to ignite the engine's fuel-air mix. The insulation on these wires protects against heat and prevents electrical interference which could cause misfires or radio static.

When ignition leads were part of the vehicle, routine replacement was important. Over time, ignition leads could crack, become brittle, or have their insulation deteriorate, leading to poor electrical conductivity. Symptoms of failing ignition leads included rough idling, difficulty starting, engine misfires, and reduced fuel economy. During servicing, mechanics would inspect ignition leads for visible damage and check resistance with a multimeter. If the resistance exceeded manufacturer specifications, replacement was recommended.

Replacing ignition leads involved ensuring the new leads were the correct length and design for the specific engine. It was important to match the resistance ratings as well, to maintain proper ignition timing and performance. Installing ignition leads involved carefully disconnecting the old wires from the coil or distributor and spark plugs and fitting new wires in the same order to prevent cross firing. Properly secured leads also helped avoid contact with hot engine parts or movement that might wear them prematurely.

Although ignition leads are not relevant to the 2018 Subaru Exiga, the vehicle's ignition system still requires careful maintenance. The coil-on-plug units themselves are generally maintenance-free and designed to last a long time. However, spark plugs need regular inspection and replacement as per Subaru's servicing schedule. Keeping spark plugs in good condition ensures optimal combustion and engine performance alongside the advanced ignition coil system.

In short, while older vehicles relied on ignition leads to deliver the spark needed for combustion, the 2018 Subaru Exiga benefits from advanced coil-on-plug technology that removes this component entirely. This system improves reliability, reduces maintenance, and boosts overall engine efficiency. For Exiga owners, focusing on spark plug care and periodic ignition coil checks will keep the engine running smoothly without worrying about ignition leads. It's a great example of how automotive technology evolves to enhance vehicle performance and simplify maintenance.