Vacuum leaks are often caused by gaps in the vacuum ... One interesting feature is its dual-mode operation in air and smoke testing, which makes it versatile for different diagnostic needs.

evap system leak and vacuum leaks. Doing a smoke test will help you pass emission inspection and help you pin point where your evap leak is. A evap leak detector like this autoline pro smoke ...

and that vacuum is filled by air drawn in through the intake system. If leaks develop in hoses or engine parts downstream from the air intake, that means additional air is going into the engine ...