Question

engine vacuum can be a useful indicator of the engines general condition. what would be the typical engine vacuum at engine idle?
select one:
a. 17\ to 21\
b. 15\ to 17\
c. 12\ to 15\
d. 23\ to 25\

Explanation:

Engine vacuum at idle is typically in the range of 17" to 21" Hg. This is a standard value based on engine mechanics and vacuum gauge readings.

Answer:

a. 17" to 21"