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ASE Engine Repair Practice Test
Multiple Choice
ASE Engine Repair
Multiple Choice Practice Test
Question 1 of 3
56% Get this Question Right
With the engine idling, a vacuum gauge connected to the intake manifold fluctuates (from 15 to 20). These fluctuations may be caused by
A
intake manifold vacuum leaks
B
a restricted exhaust system
C
sticky valve stems and guides
D
late ignition timing
Late ignition timing would result in a low, steady reading; intake manifold leaks would cause a very low, steady reading; a restricted exhaust system would cause vacuum to slowly decrease after the engine was accelerated and held steady.
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