Editing Smoke testing (mechanical) (section)

=== Automotive repair ===
In the same way that plumbing and woodwind instruments are tested, the [[vacuum]] systems of automobiles may be tested in order to locate difficult-to-find vacuum leaks. Artificial smoke is deliberately introduced into the system under slight pressure and any leaks are indicated by the escaping smoke.<ref name="pm">{{Cite web|url=https://www.popularmechanics.com/cars/how-to/maintenance/how-to-find-a-vacuum-leak|title=How to Find a Vacuum Leak|last=Allen|first=Mike|date=2011-02-28|website=Popular Mechanics|access-date=2019-01-22}}</ref> Smoke can also be used to locate difficult-to-find leaks in the fuel evaporative emissions control ([[EVAP]]) system.<ref name="pm"/>