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

This allows even slight crankcase pressure to combine with intake manifold vacuum to push oil from the lifter valley directly into the intake ports. Even if you do not see blue oil smoke on ...

The manifold absolute pressure sensor reads the amount of pressure or vacuum (also called “engine load”) in the intake manifold, where outside air is divvied up in proper amounts and ...

With some vehicles using dozens of vacuum hoses and the potential for cracks in multi-part intake manifold systems, there are plenty of places for leaks to crop up. The ducting between the ...

Vacuum leaks can develop in many locations, including the intake manifold, throttle body evaporative emissions system, power brake booster, and several other places, because some vehicles have a ...