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 ...

Variable geometry manifolds use an electronic or vacuum operated actuator that is connected to the runner flap linkage to control the direction and flow rate of the intake manifold. In the case of ...

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 ...

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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 ...