Posted by Indiana Ken on November 12, 2020 at 08:12:48 from (66.249.234.196):
In Reply to: Chevy engine experts? posted by svcummins on November 11, 2020 at 19:13:07:
With no load on the engine this is normal. If the vacuum dropped as the throttle was opened it would indicate a plugged exhaust system.
To have the manifold vacuum drop you have to open the throttle with the engine under load. For example, if you were traveling 50 MPH on a straight/level road the vacuum reading could be say 10". To maintain 50 MPH on a hill you would need to open the throttle which would cause the vacuum to drop. A drop in manifold vacuum indicates the increased load on the engine.
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