Parts for your 2013 Subaru Forester-Ignition coils

Ignition Coils on the 2013 Subaru Forester: What They Do and When to Replace Them

The 2013 Subaru Forester definitely comes equipped with ignition coils as a crucial part of its ignition system. Ignition coils play an essential role in any petrol engine, including Subaru's boxer engine found in the Forester. They convert the vehicle's 12-volt battery power into the high voltage needed to create a spark inside the engine's cylinders. This spark ignites the air-fuel mixture, which allows the engine to run smoothly and efficiently.

For someone owning a 2013 Subaru Forester, understanding what ignition coils do and how to care for them can save time, money, and prevent frustrating breakdowns. Essentially, every cylinder in the engine has its own ignition coil, making it an individual coil-on-plug arrangement rather than using a single coil pack. This design helps deliver reliable ignition performance and more precise control over spark timing.

The ignition coil consists of two wire windings inside a magnetic core: the primary winding and the secondary winding. When current flows through the primary winding, it creates a magnetic field which collapses suddenly when the current stops. This collapse induces a much higher voltage in the secondary winding. This boosted voltage is sent directly to the spark plug, which then fires a tiny but extremely hot spark.

Now, where some people get stuck is recognising if the ignition coils in their Forester need attention. Unlike older cars that used single ignition coils with distributor caps and rotors, modern engines like the 2013 Forester rely on individual coils plugged straight onto the spark plugs. These coils are exposed to a fair bit of heat and vibration, which can wear them out over time.

Typical symptoms that might hint at a failing ignition coil include:

• Engine misfires or rough idling
• Difficulty starting the engine
• Drop in fuel economy
• Check engine light turning on, often with codes related to ignition misfires
• Loss of power or hesitation under acceleration

If drivers notice any of these issues, it's wise to have a mechanic run a diagnostic scan. Unfortunately, ignition coils don't always fail completely with obvious symptoms. Sometimes they go intermittent, leading to underperformance or rough running only in certain conditions.

When it comes to maintaining the ignition coils on a 2013 Subaru Forester, there is no specific replacement interval laid out by Subaru unlike some wear items such as spark plugs, fluids, or belts. However, it's a smart idea to inspect or test them as part of routine tune-ups or if the engine starts acting up. Often, faulty coils will be accompanied by worn spark plugs, so it's practical to replace both at roughly the same time for optimal engine health.

Replacing ignition coils is generally straightforward and cost-effective. Each coil simply unplugs from the engine and the spark plug sits directly under it, so the job does not require removing too many components. For those keen on DIY, it's doable in a home garage with basic tools, but care should be taken to avoid damaging the coil connectors or spark plugs during removal and installation.

For service centres and mechanics, ignition coil replacement on the Forester is a common repair item. Suppliers provide quality aftermarket coils that fit perfectly, and genuine Subaru parts are also available, often priced slightly higher but with manufacturer warranty backing. Choosing to replace suspicious coils sooner rather than later can help avoid catalytic converter damage, which can be an expensive consequence of prolonged ignition misfires.

In terms of servicing tips, it's recommended to keep the ignition coils and their connectors free of oil, dirt, and corrosion. Sometimes engine oil leaks or moisture can affect the coil boots and cause electrical shorts or poor contact. Regularly cleaning the coils and ensuring the wiring harness connections are secure can prolong the life of these parts.

Another useful tip for Forester owners is to pay attention to symptoms especially if the vehicle has high mileage or has been driven in harsh environments. Australia's hot climate and dusty conditions can place extra stress on engine components, including ignition coils. Regular inspections during scheduled servicing or oil changes can spot any early signs of wear and nip issues in the bud.

Overall, ignition coils are essential for the 2013 Subaru Forester's performance and fuel efficiency. They are a relatively simple item to maintain and replace, but ignoring their condition can lead to more serious engine problems. Keeping an eye on engine behaviour and acting promptly when faults arise is a practical way to ensure many years of trouble-free driving with your Forester.