When an engine is inspected for a potential vacuum leak it is the smoke test that is popularly used by motor mechanics. This short informational article unravels for you how the smoke test vacuum leak inspection proceeds. A pro-grade tool is utilized to conduct a corrective test, rather than using amateurishly rudimentary spin-offs that could have been dangerous if the DIY practitioner took his eyes off the ball.
Or off the engine. The use of the tool may be effective enough but according to one popular but authoritative online engineering magazine, the use of a smoke generator goes much further. Hunting down potential leaks with a smoke generator is a simplified process. Leaks come forward in ‘bunches’ owing to the fact that rubberized hoses and plastic vacuum fittings will deteriorate as the motor car ages.
Before the professional vacuum leak test is run, all potential ports within the ‘intake manifold’ needs to be plugged up. This process usually begins at the inlet to the throttle body located within the engine’s air cleaner. The smoke detector’s nozzle will then be connected to the manifold. For the purposes of speed in sealing an inlet, the air cleaner could be wrapped in cling-wrap. The engineer must always remember to remove the wrap once the test has been completed.
After the smoke button is hit, the engineer waits a couple of minutes to saturate the intake tract. Any smoke emanating from the engine’s oil fill port could be a sign that the vent system is defective. Other than that, the engineer needs bright light to detect any signs of smoke elsewhere within the engine. A cracked header or a leaking gasket could leak air into the exhaust system thus deceiving oxygen sensors.
Leaks can let in air without any noise emanating from the exhaust.