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Exam 5: Factors Affecting Engine Performance

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Question 31

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What component maintains the correct fuel pressure in the fuel rail?

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Question 32

Multiple Choice

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Compression testing is being discussed. Technician A says that the ignition should be disabled. Technician B says that the fuel system should be disabled. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

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Question 33

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A leaking exhaust valve can affect the air/fuel mixture in a cylinder.

Improper fuel can cause the valves in an engine to knock or rattle.

During a running compression test, the pressures at a steady 2,500 rpm will be lower than the readings of a cranking compression test.

Technician A says that a blown head gasket can cause coolant to mix with the engine oil to create a coffee-colored milkshake-like substance. Technician B says that white smoke from the exhaust pipe can be the result of a blown head gasket. Who is correct?

When does detonation occur and what can it cause?

A cylinder is reading a 100 percent leakage during a cylinder leakage test. Technician A says the exhaust valve could be open. Technician B says the exhaust valve could be bent. Who is correct?

What color smoke is caused by an engine that is burning oil in the combustion chamber?

OEM parts are made by aftermarket manufacturers to exceed factory original specifications.