vacuum leak test

[TMat]

I was reading on another site about a way to find an internal vacuum leak.

It said to seal off all vacuum ports on the intake manifold , then crank the engine over and see what reading you get on a vacuum gauge. If you get 0 - 2 in/hg on the gauge it means you have an internal vacuum leak.

Is there any truth to this?

[TMat]

anyone?

[MrQuick]

where is the gauge connected to? sealed crank case vent fittng yes (PVC disconnected, gauge plugged into valve cover hole) , manifold port?

[TMat]

Here is the link (http://www.crankshaftcoalition.com/wiki/Finding_vacuum_leaks) to the description, scroll down to "vacuum gauge method (internal)"