Parts for your 2022 Subaru Impreza-Ignition leads

Ignition Leads on the 2022 Subaru Impreza: Are They Used and What You Need to Know

The 2022 Subaru Impreza does not use traditional ignition leads as part of its engine ignition system. This may come as a surprise to some, especially those familiar with older vehicles or simpler ignition setups. Modern cars like the 2022 Impreza have moved on from using ignition leads for a number of technical and performance reasons.

Ignition leads, sometimes known as spark plug wires, used to be a common component in vehicles with distributor-based ignition systems. They are essentially thick, insulated cables that carry high voltage from the distributor or ignition coil to each spark plug. This high voltage is what creates the spark inside the spark plug, igniting the air-fuel mixture in the engine's combustion chambers.

However, the 2022 Subaru Impreza utilises a more modern ignition design called coil-on-plug (COP) ignition. Instead of one distributor and multiple ignition leads, each spark plug has its own dedicated ignition coil mounted directly on top of it. This means there is no need for separate ignition leads because the high voltage is generated right at the spark plug itself. With the coil on plug system, the wiring between the coil and spark plug is internal and integrated into the coil, making traditional leads obsolete.

This switch away from ignition leads offers various benefits:

• Improved reliability - fewer parts exposed to engine heat and vibrations means less chance of ignition lead failure
• Better ignition timing and spark control - electronic coil packs can fire spark plugs more precisely than older distributor systems
• Reduced maintenance - no need to replace ignition leads regularly
• Greater efficiency and performance - optimised spark delivery helps improve fuel burn and reduce emissions

Because the 2022 Subaru Impreza does not use ignition leads, there is no need to worry about maintaining or replacing them like in older vehicles. You won't find ignition lead replacement as part of routine service schedules for this model. Instead, the focus is on maintaining the ignition coils and spark plugs themselves, which play critical roles in ensuring the engine runs smoothly and efficiently.

Even though ignition leads are not part of the Impreza's engine tech, understanding their traditional role is useful. In older cars, worn ignition leads often cause misfires, rough idling, poor fuel economy, and general engine performance issues. High voltage can leak from damaged leads, preventing the spark plugs from firing correctly. That is why ignition leads were once a regular maintenance item, often replaced at intervals of around 60,000 to 100,000 kilometres or when symptoms arose.

The Coil-On-Plug setup used in the Impreza essentially eliminates those issues because the coil is physically attached to the spark plug, creating a more direct electrical path. They are sealed units designed to withstand harsh engine conditions, making them more durable than ignition leads.

When servicing a 2022 Subaru Impreza, mechanics will typically check the condition of the ignition coils and spark plugs. Although coils can fail at times, it usually happens gradually, with symptoms like engine hesitation, decreased power, or even a check engine light coming on. If a coil does need replacement, it is a straightforward job of swapping out the faulty coil with a new one. This process is generally less labour-intensive than replacing distributor parts and ignition leads in older vehicles.

For owners keen on keeping their Impreza running well, regular servicing as recommended by Subaru is the best approach. This includes changing the spark plugs at specified intervals and having diagnostic checks to catch any ignition or engine management issues early. Having quality replacement parts and fitting them professionally helps maintain the reliability and performance that modern Subaru engines are known for.

In essence, while ignition leads were once a key component of car ignition systems, the 2022 Subaru Impreza's modern engine design does not require them. This reflects how automotive technology has evolved to improve engine efficiency, reduce maintenance hassles, and enhance overall vehicle performance. Those who are familiar with classic ignition systems might miss the simple service of changing leads, but the benefits of not having them in newer cars definitely outweigh the nostalgia.

So the next time someone wonders about ignition leads on the 2022 Subaru Impreza, remember the coil-on-plug setup is why those cables have disappeared. Instead, keeping the ignition coils and spark plugs in good shape is the key to smooth starts and strong performance.