How normal is the intake pressure of the new Jetta?

The normal vacuum value of the engine intake manifold is 64-7 1kpa. 1. If one cylinder cannot work normally, the single cylinder flameout method can be adopted. After the single cylinder flameout, the larger the PX drop value, the better. This is an index to judge the work of each cylinder (ignition, fuel injection and sealing). Quickly open and close the throttle. If the instrument pointer swings sensitively between 6.7 kPa and 84.6 kPa, it shows that PX has good tracking performance for the change of throttle opening, which means that the sealing performance of all components is good under all working conditions. 2. If the seal is not good, PX is lower than normal at idle speed, which is obviously unstable. When the throttle valve is opened quickly, the instrument pointer will drop to zero, and the instrument pointer will not return to 84.6kpa after the throttle valve is closed. Verify the tightness of each cylinder, connect the vacuum gauge to the dipstick hole of the plug-in machine, and measure the pressure in the crankcase as negative pressure; If it is positive, it means that PVC is poorly sealed or poorly ventilated.