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Merhaba Kerim,

-0.45 Bar is a bit low for an engine in idle. It should be -0,5 or more.

During warm up, AAV adds more air and is a bypass to throttle. That is why a lower vaccuum is correct then.

ok thanks dear dr volker
What do you suggest I do?

Hi,

just use a disco fogging macheine and press smoke in manifold to see where it leaks.

ok thanks dr volker.
best regards
kf

hallo dr. volker,

I tried again today at idle to measure the minus pressure of the map sensor. The result is again ( -0.45 bar). Then I increased the air intake from the idle air adjustment screw under the intake manifold. In this way, when the air intake increased, the map sensor pressure became (-0.5 bar). Is this a correct action? Should it stay this way?
thanks best regards
kerim falay

Merhaba Kerim,

everything starts with correct ignition dwell and timing plus idle rpm. Then you can measure. Increased idle speed will decrease vacuum.