Parts for your 2018 Subaru Forester-Ignition coils

Ignition Coils on the 2018 Subaru Forester: What They Do and When to Replace Them

The 2018 Subaru Forester is a reliable, go-anywhere SUV that many Aussies love for its blend of safety, performance, and practicality. Underneath all that Subaru engineering lies an essential component in the engine's ignition system called the ignition coil. So what exactly do ignition coils do in the Forester, and why is it important to keep them in good nick? Let's take a closer look at these little powerhouses and how they fit in with maintaining your Forester's engine health.

Ignition coils are a crucial part of the Subaru Forester's petrol engine. Essentially, the ignition coil transforms the 12-volt power from the battery into the high voltage output necessary to create a powerful spark at the spark plugs. This spark then ignites the air and fuel mixture inside the cylinders, powering the engine. Without ignition coils working effectively, the engine wouldn't fire up properly, causing misfires, rough running, or failure to start altogether.

The 2018 Forester uses a modern coil-on-plug ignition system. This means there is one coil dedicated to each spark plug. Each coil sits directly on top of the plug, eliminating the need for spark plug wires. This design increases the reliability of the ignition system and improves fuel efficiency. Because of this, if one coil becomes faulty, it usually affects the particular cylinder it's connected to, which can make diagnosing problems a bit easier.

When it comes to maintenance or potential replacement, ignition coils aren't something Subaru drivers usually need to tinker with regularly. They are built tough and can last for a long time, often over 100,000 kilometres. However, several factors can cause ignition coils to fail prematurely, such as exposure to moisture, heat, vibration, or electrical wear and tear.

Signs that an ignition coil might be struggling include the engine running rough, especially at idle, decreased fuel economy, a noticeable drop in power, or the check engine light coming on. A mechanic will often find fault codes related to misfires or specific cylinder errors when checking the vehicle's computer system. If the ignition coil is confirmed to be faulty, replacing it is usually a straightforward job but it's best to get it done sooner rather than later to avoid damaging other engine components like the catalytic converter.

For the 2018 Subaru Forester owner, routine servicing can help catch ignition coil issues early. While changing spark plugs is a common part of the tune-up schedule, inspecting ignition coils is equally important since they work closely together to ensure the engine fires efficiently. A simple physical check for cracks, corrosion on the terminals, or signs of overheating can alert you to potential problems before they result in a breakdown.

When replacement is necessary, it's advisable to fit genuine Subaru ignition coils or high-quality equivalents that match the vehicle's specifications. Cheap or incompatible coils might save money initially but could lead to poor engine performance or even damage. It's also a good idea to replace spark plugs at the same time since new coils and plugs together promote better combustion and longevity.

Given the coil-on-plug system's design, replacing an ignition coil doesn't require removing a heap of engine components, making DIY replacement feasible for those comfortable with basic car maintenance. However, having a professional handle the diagnostic and replacement process ensures the job is done correctly and reduces the chance of installation errors.

Ultimately, ignition coils might be small, but they are mighty important for keeping the 2018 Subaru Forester running smoothly. Regular care and prompt attention to any engine performance issues can help prevent inconvenient breakdowns and expensive repairs down the track. Paying attention to the ignition system is a smart way to protect the heart of the Forester and enjoy hassle-free driving through the Aussie bush or urban streets.