The pumping of an engine’s pistons creates a vacuum in the cylinders, and that vacuum is filled by air drawn in through the intake system. If leaks develop in hoses or engine parts downstream ...

A vacuum leak generally won't keep your engine from starting, but it can be one of the issues that activate that pesky "check engine" light on your dashboard. It could also cause other problems ...

A vacuum leak in a car occurs when there's an unintended opening in the vacuum system, which allows air to enter the engine.