[Schulisco]

Please post a picture from the sensor plate resting position from underneath that we can see where it is sitting in the cone of the sensor plate housing.

Did you checked for tightness of the whole CIS with a smoke generator?

As others said already, you measurings of the CP makes absolutely no sense for a proper running CIS. The CP must be in the specified interval:



If your pressure readings were correct indeed, then there are some serious issues on it. The FD urges for the CP as it works as a counterweight to prevent the sensor plate moves too much corresponding to the sucked air. If the CP doesn't exist some time the rest of the CIS is tinted that much to cover this without solving the issues. This means you need a complete checkup of all CIS components to make sure that they are working as specified.

Here you find a troubleshooting guide for pre lambda CIS:
https://cis911primer.com/Troubleshooting%20Guide/Notebook%20Spiral.html

Also the whole 911primer website is quite informative.

The injectors are specified to open in an interval between 2.5-3.6bar! They're not bad if the opening pressure is higher than 2.5bar, as long as it is not higher than 3.6bar! You never have injectors opening at the same pressure. These injectors / jets / valves are pure mechanical with given tolerances.

Thomas