Why is there rust on your coil packs?

Rust on coil packs can occur due to exposure to moisture, humidity, and road salt, which can lead to corrosion over time. Additionally, if the engine bay is not well-sealed or if there are leaks, water can accumulate and contribute to rust formation. It's important to address any underlying issues, such as leaks or poor sealing, to prevent further damage to the ignition system. Regular maintenance and inspection can help mitigate this problem.