Exam 32: Intake and Exhaust Systems

Describe the main purpose of a catalytic converter.

Before replacing an exhaust system component, Technician A soaks all old connections with a penetrating oil. Technician B checks the old system's routing for critical clearance points. Who is correct?

What manages turbo output by controlling the amount of exhaust gas entering the turbine housing?

When intake air is compressed, its temperature decreases significantly.

What are the component parts of a turbocharger?

Technician A says the action of the wastegate is controlled directly by manifold pressure. Technician B says the wastegate is controlled by the PCM. Who is correct?

Lack of lubrication and oil lag are major causes of turbocharger failure.

Technician A says a vacuum leak results in less air entering the engine, which causes a richer air/fuel mixture. Technician B says a vacuum leak in the system can cause the engine to run poorly. Who is correct?

Describe the construction of a muffler.

Technician A says the emission vacuum schematic for the vehicle can only be found in the factory service manual. Technician B say an emissions vacuum schematic is given on an under-hood decal. Who is correct?

A turbocharged engine is running with 10 psi (69 kPa) of turbo boost. At what pressure is air being fed into the engine when the engine is operating at sea level?

An engine can be either supercharged or turbocharged, but not both.

Normal engine vacuum on a normally aspirated engine at idle is between ____________________ in. Hg and ____________________ in. Hg.

Modern intake manifolds for engines with port fuel injection are typically made of die-cast aluminum or plastic.

Technician A says an intake manifold that delivers both air and fuel [carburetor or TBI] is designed to cause turbulence so that the air and fuel mix while they are being delivered to the cylinders. Technician B says in an air only type manifold [PFI] the length of the runners is designed to achieve the best performance during a particular range of engine speeds. Who is correct?

The __________________ is a chart of the vacuum hose routings, vacuum source, and relative component locations for all emissions-related equipment.

What is turbo lag?

A miniconverter is used _____.

All the following statements concerning variable nozzle turbine (VNT) type turbochargers are true EXCEPT:

Wet intake manifolds have __________________ passages cast directly in them.