The air/fuel mixture entering the engine reaches the inlet valve at the pressure in the inlet manifold (the Manifold Pressure). Unless the throttle is wide open, this pressure will be less than ...

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 ...

It turns out that the manifold can be an important source of back pressure because exhaust gases from one cylinder build up pressure in the manifold that affects the next cylinder that uses the ...