As the noise is at half the engine speed it sounds like it is coming from either a hydraulic valve lifter or rocker arm. This can be caused by bad or low engine oil, low oil pressure, worn hydraulic lifter or damaged rocker arm
Please see good video.
At times the lifter for the high-pressure pump wears which also could make a similar noise
See video on how to check it.
Please let us know how you get along.
Monday, April 11th, 2022 AT 7:53 AM