A normal vacuum gauge reading while the engine is idling is steady and at _____. The rougher the engine runs, the more the gauge readings will fluctuate.
A) 8 in. Hg
B) 17 in. Hg
C) 22 in. Hg
D) 30 in. Hg

Question

Quizplus · Accepted Answer

A normal vacuum gauge reading for an engine at idle is typically steady around 17 in. Hg. This indicates proper engine function and good vacuum.

A Normal Vacuum Gauge Reading While the Engine Is Idling