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2. Crankcase ventilation system - Wikipedia

   en.wikipedia.org/wiki/Crankcase_ventilation_system

   The intake manifold vacuum, with wide open throttle, is lower in these conditions, which causes the PCV valve to open and the crankcase gases flow to the intake system. [13] The greater flow rate of intake air during these conditions means that a greater quantity of blow-by gases can be added to the intake system without compromising the ...

3. Onboard refueling vapor recovery - Wikipedia

   en.wikipedia.org/wiki/Onboard_refueling_vapor...

   The purge valve controls the purge vapor purge line, through which the manifold vacuum pulls air through the vapor storage device and purges it of fuel vapors. The electronic control unit (ECU) controls the opening and closing of this valve. [8] [dead link ‍]

4. Manifold vacuum - Wikipedia

   en.wikipedia.org/wiki/Manifold_vacuum

   Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere. Manifold vacuum is an effect of a piston's movement on the induction stroke and the airflow through a throttle in the intake manifold of an engine. It is a measure of the amount of restriction of ...

5. Manifold injection - Wikipedia

   en.wikipedia.org/wiki/Manifold_injection

   Alternatively, a manifold vacuum sensor can be used. The manifold vacuum sensor signal, the throttle position, and the crankshaft speed can then be used by the engine control unit to calculate the correct amount of fuel. In modern engines, a combination of all these systems is used. [5]

6. MAP sensor - Wikipedia

   en.wikipedia.org/wiki/MAP_sensor

   The way they do this is during a deceleration of the vehicle when there is low absolute pressure in the intake manifold (i.e., a high vacuum present in the intake manifold relative to the outside air) the powertrain control module (PCM) will open the EGR valve and then monitor the MAP sensor's values. If the EGR is functioning properly, the ...

7. Inlet manifold - Wikipedia

   en.wikipedia.org/wiki/Inlet_manifold

   Carburetors used as intake runners A cutaway view of the intake of the original Fordson tractor (including the intake manifold, vaporizer, carburetor, and fuel lines). An inlet manifold or intake manifold (in American English) is the part of an internal combustion engine that supplies the fuel/air mixture to the cylinders. [1]