Exam 32: Intake and Exhaust Systems

The number-one cause of turbocharger failure is __________________.

The ____________________ cools the turbocharged air before it reaches the combustion chamber.

Variable intake manifolds are being discussed. Technician A says an intake manifold tuning (IMT) system uses a butterfly valve to divide the plenum into two small chambers at low speeds. At high engine speeds, the butterfly valve opens to form one large plenum chamber. Technician B says the intake manifold runner control (IMRC) system changes the path of air between long and short runners or between small-diameter and large-diameter runners according to engine speed. Who is correct?

An engine in good condition will produce a steady, constant vacuum reading above 15 inches at a warm idle.

Engine vacuum may be used to operate the ______.

Generally, an engine designed for maximum torque and horsepower at high speeds has longer runners than one that provides high torque at lower speeds.

Technician A says the engine should idle for 20 to 120 seconds after a hard run to allow the turbocharger shaft to cool. Technician B says if the vehicle has not been driven for a few days, start the engine up and run it at 2,000 to 2,500 rpm to flush the old oil out of the turbocharger bearings and oil lines. Who is correct?

Which of the following is NOT an engine exhaust pollutant that is changed by the catalytic converter?

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?

In an intake manifold for a PFI engine, the __________________ serves as a reservoir for the air and is used to distribute the intake charge evenly to the runners and intake ports.

The higher the altitude, the lower the atmospheric pressure.

What is a vacuum?

Technician A says the air filter is designed to prevent engine fires in the event of a backfire. Technician B says the air filter assembly is also designed to help reduce the noise caused by the movement of intake air. Who is correct?

How is vacuum created inside the engine?

What are the three functions of the exhaust system?

Which of the following statements concerning superchargers is NOT correct?

If a catalytic converter in a late model vehicle is not working properly, the ______________________ will turn on.

Which of the following is NOT a characteristic of a turbocharger?

Atmospheric pressure appears as ____________________ on most pressure gauges.

The butterfly valve in IMRC systems is controlled by an electric motor or __________________ actuator.