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hello
Today I receive vanos oil pressure gauge which can measure to 250 bar and we test my vanos (s50b30).

I suspect that pressure is not ok so I need help.

We connect gauge after engine is off for about hour. Engine is turned on and gauge show zero (0) pressure for about 5-7 seconds and vanos is noisy. Than pressure start to rising up to about 65bar, on idle. When I rise rpm, pressure progress to 100bar and stay here when rpm is high. We turn off engine, wait for 10 seconds and started it again. Pressure is again at zero for several seconds and slowly go to 65bar. So pressure drop very fast. I try to make difference with regulator valve but with no success after several turns so I return it to first position. I can make 100bar with pressure regulator on idle, BUT, when engine is reved pressure rise to 150bar???
I think that pressure must be 100bar even on idle so maybe is my pressure accumulator bad? But if vanos pump dont produce 100bar on idle even pressure accumulator wont help.

here is one video from other member but my vanos have same symptoms, low idle pressure and slow pressure buildup under load:
http://flic.kr/p/dq2gt5


Any advice?