Exam 48: Diagnosing Engine Performance Problems

How would you perform a cranking vacuum test?

While having a discussion, Technician A says that dry black soot at the exhaust pipe indicates an overly rich air-fuel mixture. Technician B says that it indicates oil consumption. Who is correct?

A(n) ____________________ is indicated when the needle drops at regular intervals.

While having a discussion, Technician A says that a compression test will tell the condition of oil control rings and compression rings. Technician B says that the compression test will only tell the condition of compression rings. Who is correct?

Dirty fuel injectors can cause driveability problems and ____ at full throttle.