What is necessary to inspect for exhaust leaks?

To inspect for exhaust leaks effectively, the vehicle should be running. This is essential because exhaust gases can only be detected when the engine is operating. When the engine is running, the exhaust system is pressurized, which can cause leaks to produce noise and emissions that can be easily identified. Additionally, the operation of the engine creates vibrations and temperature variations that might help in locating the sources of any leaks.

Inspecting while the vehicle is parked or with the engine off would not provide the necessary conditions to detect these leaks, as there would be no exhaust flow or pressurization in the system. Going to inspect after dark may help see visual symptoms, such as smoke or light escaping, but the most direct and effective means of detecting leakage is to conduct the inspection with the engine running. This approach ensures that you can observe any irregularities that would indicate an exhaust leak, making it the most viable choice for a thorough inspection.