Having a car like the Nissan Cube sit unused and exposed to the elements for three years can be a daunting challenge to revive. I once faced a similar situation where a trusty vehicle had been left outside, subject to weather, rust, and battery degradation for years. The first critical step for me was addressing the battery and electrical system—usually, after three years of sitting, the battery would be dead or completely unusable. In this case, I recommend replacing the battery or using a reliable charger to bring it back to life gently. Beyond the battery, fuel system issues often arise after long periods of inactivity. Old gasoline can turn stale, clogging fuel lines and injectors. Draining old fuel and refilling with fresh gasoline, coupled with using a fuel system cleaner, proved vital in my experience to get the engine running smoothly again. The Nissan Cube's unique design also demands some careful attention to seals and weatherstripping, which can deteriorate and lead to leaks or interior damage. Inspecting and replacing these components as needed helps preserve the vehicle’s interior and prevent further rot. I found that patience during the initial crank is crucial; repeated attempts without immediate success are common when bringing a long-dormant engine back to life. Listening for sounds such as the starter motor engaging or fuel pump priming can provide clues that the engine is responding. It’s also essential to keep safety in mind—after a vehicle has been sitting for an extended period, brakes, tires, and fluids require thorough checks and potentially full replacements to ensure the car is safe to drive. Overall, restoring a Nissan Cube (or any project car) that has sat rotten for years is a rewarding journey that combines mechanical knowledge with perseverance. Seeing the engine finally roar to life after so much anticipation is truly one of the best feelings for any car enthusiast. Additionally, tools from brands like VEVOR have been invaluable for maintenance tasks during restoration, providing reliable performance for various automotive repairs. This experience reinforced how rewarding it is to revive a neglected vehicle and breathe new life into a project car that many might have considered a lost cause.