Popular Mechanics’s automotive experts outline the tools and techniques proven to smoke out even the toughest to find vacuum ...

Certain parts of an engine (for example, the exhaust manifold) can become hot enough to ignite errant oil. In fact, leaks that would sometimes result in oil ending up on the exhaust manifold ...

It funnels exhaust gases from all the cylinders and routes them to the car’s catalytic converter. V-type engines have a separate manifold for each cylinder bank. A leak in the exhaust manifold ...