In this video, I tackle the challenge of finding a vacuum leak in a car. I demonstrate how to create a smoke test machine to ...

Diagnostic leak detection technology — sometimes referred to in the field as smoke testing or using a smoke machine — is being used by the most advanced fleets as a surprising solution to ...

Air leaking into your car—not out of it—can be a problem. Popular Mechanics’s automotive experts outline the tools and techniques proven to smoke out even the toughest to find vacuum leaks.

Coolant leaks aren’t always easy to find, as air blowing through the front of the car can spread coolant all over, and that means the puddle you see on the ground may not be directly under the leak.