How much vacuum pressure should an m70 v12 engine in a 1990 bmw 750 il have?And how do you check it.How do you test the vacuum pressure on a 1990 bmw 750 il?The vacuum pressure would be pretty much the same as in most internal combustion engines (highest at idle approx. 20-26 mmhg when the throttle valve is closed, lowest at high rpm when the throttle is wide open ).
You need a T-connector and extra vacuum hose to connect to any of the vacuum ports of the intake manifold.
The suggested locations would be at the (front) throttle valve where the tank vent valve connects; or at the fuel pressure regulator on top of the fuel injector common rail.
I am not sure if there are rubber caps at the back of the intake manifolds hiding vacuum ports but take a look also.
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