What is the normal value of absolute pressure in the car intake pipe?

[RonanAnn]

Engine intake manifold vacuum should normally be between 64-71kPa. 1. Working indicators: If a certain cylinder is malfunctioning, the single-cylinder cut-off method can be used for diagnosis. After cutting off a single cylinder, the greater the drop in Px, the better, which serves as an indicator of each cylinder's performance (ignition, fuel injection, sealing). Quickly open and close the throttle. 2. Measuring vacuum: Located in the engine compartment, it is connected to the intake manifold via a vacuum tube or directly installed on the intake manifold behind the throttle. It measures the absolute pressure in the intake manifold behind the throttle, detecting changes in absolute pressure within the manifold based on engine speed and load.