Technician A says a vacuum leak will cause an engine to run richer than normal. Technician B says a vacuum leak can cause an engine to detonate. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

A vacuum leak introduces additional air into the engine, making the air-fuel mixture leaner, not richer, so Technician A is incorrect. A lean mixture can indeed cause an engine to detonate, making Technician B correct.

Technician a Says a Vacuum Leak Will Cause an Engine